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1
Walsh, Justin, Luigi Pontieri, Patrizia d'Ettorre e Timothy A. Linksvayer. "Ant cuticular hydrocarbons are heritable and associated with variation in colony productivity". Proceedings of the Royal Society B: Biological Sciences 287, n. 1928 (10 giugno 2020): 20201029. http://dx.doi.org/10.1098/rspb.2020.1029.
Testo completoAbstract (sommario):
In social insects, cuticular hydrocarbons function in nest-mate recognition and also provide a waxy barrier against desiccation, but basic evolutionary features, including the heritability of hydrocarbon profiles and how they are shaped by natural selection are largely unknown. We used a new pharaoh ant ( Monomorium pharaonis ) laboratory mapping population to estimate the heritability of individual cuticular hydrocarbons, genetic correlations between hydrocarbons, and fitness consequences of phenotypic variation in the hydrocarbons. Individual hydrocarbons had low to moderate estimated heritability, indicating that some compounds provide more information about genetic relatedness and can also better respond to natural selection. Strong genetic correlations between compounds are likely to constrain independent evolutionary trajectories, which is expected, given that many hydrocarbons share biosynthetic pathways. Variation in cuticular hydrocarbons was associated with variation in colony productivity, with some hydrocarbons experiencing strong directional selection. Altogether, this study builds on our knowledge of the genetic architecture of the social insect hydrocarbon profile and indicates that hydrocarbon variation is shaped by natural selection.
2
Fan, Yongliang, Jody Chase, Veeresh L. Sevala e Coby Schal. "Lipophorin-facilitated hydrocarbon uptake by oocytes in the German cockroachBlattella germanica(L.)". Journal of Experimental Biology 205, n. 6 (15 marzo 2002): 781–90. http://dx.doi.org/10.1242/jeb.205.6.781.
Testo completoAbstract (sommario):
SUMMARYLarge amounts of hydrocarbons accumulate during vitellogenesis in the developing basal oocytes of the German cockroach Blattella germanica (L.), and all ovarian hydrocarbons are deposited into an egg case (ootheca) during oviposition. Hydrocarbons are not synthesized by the ovaries, but are delivered by hemolymph lipoproteins and accumulate within the basal oocytes. A native B. germanica hydrocarbon, [3H]3,11-dimethylnonacosane, injected into adult females of various ages, was taken up by the ovaries in relation to oocyte growth. Ovarian uptake of the hydrocarbon was low in day 0–1 females, increased dramatically between days 3 and 6 and declined sharply through oviposition on day 8–9; ovarian uptake of the hydrocarbon was low during a 21-day pregnancy that followed. [1-14C]Propionate, which becomes incorporated into methyl-branched hydrocarbons, was injected into 5-day-old vitellogenic females to monitor the de novo biosynthesis of hydrocarbons and the time course of hydrocarbon deposition in the ovary. Propionate was rapidly incorporated into hydrocarbons within 4 h. Hydrocarbon uptake by the ovaries, however, was three times higher 24 h after injection than 4 h after injection, showing that hydrocarbons are slowly and continuously deposited in oocytes. This result was confirmed with topical application of [3H]3,11-dimethylnonacosane: ovarian uptake was three times higher after 24 h than after 4 h. In vitro incubations of sternites, which synthesize hydrocarbons, with [14C]propionate and ovaries, showed that both hemolymph and purified high-density lipophorin facilitated ovarian uptake of newly synthesized hydrocarbons; maximum uptake occurred with 10 % hemolymph or 1 mg ml–1 high-density lipophorin. These results were confirmed with sternites treated with [3H]3,11-dimethylnonacosane and co-incubated with ovaries. This is the first report to show that copious amounts of maternal hydrocarbons are provisioned in oocytes and to demonstrate the existence of a hydrocarbon transport pathway involving hemolymph high-density lipophorin.
3
Petrů, Jiří, Tomáš Herink, Jan Patera e Petr Zámostný. "Co-Pyrolysis of Unsaturated C4 and Saturated C6+ Hydrocarbons—An Experimental Study to Evaluate Steam-Cracking Performance". Materials 16, n. 4 (8 febbraio 2023): 1418. http://dx.doi.org/10.3390/ma16041418.
Testo completoAbstract (sommario):
Unsaturated C4 hydrocarbons are abundant in various petrochemical streams. They can be considered as a potential feedstock for the steam-cracking process, where they must be co-processed with C6 and higher (C6+) hydrocarbons of primary naphtha fractions. Co-pyrolysis experiments aiming at the comparison of different C4 hydrocarbon performances were carried out in a laboratory micro-pyrolysis reactor under standardized conditions: 820 °C, 400 kPa, and 0.2 s residence time in the reaction zone. C4 hydrocarbons were co-pyrolyzed with different co-pyrolysis partners containing longer hydrocarbon chain to study the influence of the co-pyrolysis partner structure on the behavior of C4 hydrocarbons. The yields of the pyrolysis products and the conversion of C4 hydrocarbons were used as the performance factors. A regression model was developed and used as a valuable tool for quantifying the inhibition or acceleration effect of co-pyrolysis on the conversion of co-pyrolyzed hydrocarbons. It was found that the performance of different C4 hydrocarbons in co-pyrolysis is substantially different from the separate pyrolysis of the individual components.
4
Lea-Smith, David J., Steven J. Biller, Matthew P. Davey, Charles A. R. Cotton, Blanca M. Perez Sepulveda, Alexandra V. Turchyn, David J. Scanlan, Alison G. Smith, Sallie W. Chisholm e Christopher J. Howe. "Contribution of cyanobacterial alkane production to the ocean hydrocarbon cycle". Proceedings of the National Academy of Sciences 112, n. 44 (5 ottobre 2015): 13591–96. http://dx.doi.org/10.1073/pnas.1507274112.
Testo completoAbstract (sommario):
Hydrocarbons are ubiquitous in the ocean, where alkanes such as pentadecane and heptadecane can be found even in waters minimally polluted with crude oil. Populations of hydrocarbon-degrading bacteria, which are responsible for the turnover of these compounds, are also found throughout marine systems, including in unpolluted waters. These observations suggest the existence of an unknown and widespread source of hydrocarbons in the oceans. Here, we report that strains of the two most abundant marine cyanobacteria,ProchlorococcusandSynechococcus, produce and accumulate hydrocarbons, predominantly C15 and C17 alkanes, between 0.022 and 0.368% of dry cell weight. Based on global population sizes and turnover rates, we estimate that these species have the capacity to produce 2–540 pg alkanes per mL per day, which translates into a global ocean yield of ∼308–771 million tons of hydrocarbons annually. We also demonstrate that both obligate and facultative marine hydrocarbon-degrading bacteria can consume cyanobacterial alkanes, which likely prevents these hydrocarbons from accumulating in the environment. Our findings implicate cyanobacteria and hydrocarbon degraders as key players in a notable internal hydrocarbon cycle within the upper ocean, where alkanes are continually produced and subsequently consumed within days. Furthermore we show that cyanobacterial alkane production is likely sufficient to sustain populations of hydrocarbon-degrading bacteria, whose abundances can rapidly expand upon localized release of crude oil from natural seepage and human activities.
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Alaidaroos, Bothaina A. "Advancing Eco-Sustainable Bioremediation for Hydrocarbon Contaminants: Challenges and Solutions". Processes 11, n. 10 (22 ottobre 2023): 3036. http://dx.doi.org/10.3390/pr11103036.
Testo completoAbstract (sommario):
In an era of rising population density and industrialization, the environment confronts growing challenges. Soil, agricultural land, and water bodies are becoming increasingly polluted by petroleum waste and hydrocarbons. While hydrocarbons are naturally present in crude oil, refining processes compound the complexity and toxicity of hydrocarbons. This is particularly evident in polycyclic aromatic hydrocarbons (PAHs) found in the air and soil, known for their carcinogenic, mutagenic, and teratogenic properties. In response, biodegradation emerges as an eco-friendly, cost-effective solution, especially in petroleum-contaminated settings. Biodiverse microbial communities play a pivotal role in managing hydrocarbon contamination, contingent on location, toxicity, and microbial activity. To optimize biodegradation, understanding its mechanisms is essential. This review delves into varied bioremediation techniques, degradation pathways, and the contributions of microbial activities to efficiently removing hydrocarbon pollutants. Recent research spotlights specific microorganisms like bacteria, microalgae, and fungi adept at hydrocarbon degradation, offering a contemporary perspective on petroleum hydrocarbon pollutant bioremediation. These microorganisms efficiently break down petroleum hydrocarbons, with enzymatic catalysis markedly accelerating pollutant breakdown compared to conventional methods. Given the intricate nature of hydrocarbon contamination, cooperative bacterial consortia are instrumental in effective cleanup, driven by specific genes guiding bacterial metabolism. For cost-effective and efficient removal from compromised environments, it is advisable to adopt an integrated approach that combines biostimulation and bioaugmentation.
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ANDREEV, A. P., R. B. BITUEV, A. V. MESHCHERYAKOV, M. I. SAUTIEV e D. V. FROLOV. "Investigation of hydrocarbon absorption by foam". Fire and Emergencies: prevention, elimination 2 (2024): 39–45. http://dx.doi.org/10.25257/fe.2024.2.39-45.
Testo completoAbstract (sommario):
Purpose. To explain the behavior of air-mechanical foam in contact with hydrocarbons, there are generally accepted ideas about the thermodynamic stability of asymmetric aqueous films. These concepts cannot be considered exhaustive, since they do not explain the phenomena of foam stabilization in contact with hydrocarbons. The reason for the stabilization of foam films is the formation of stable emulsions in them caused by mass transfer. The aim of the work is to investigate the phenomenon of mass transfer between the aqueous phase and hydrocarbons on the stability of foam in contact with hydrocarbons. The following tasks are set in the work: to experimentally establish the effect of mass transfer on the contact destruction/stabilization of foam and the effect of hydrocarbon emulsification on the stability of foam from foaming agents of various nature. Methods. The experimental research method consists in measuring the rate of destruction of foam in contact with liquid and gaseous hydrocarbons, as well as with hydrocarbon vapors. Findings. The paper presents the results of experimental studies, on the basis of which it is shown that the intensification of the mass transfer process between the aqueous phase and the hydrocarbon contributes to the stabilization of foam in contact with hydrocarbons. A study of the destruction of foam in hydrocarbon vapors has shown that, regardless of the nature of foaming agents, the greatest stabilization of foam is observed in the case of compliance of the foaming agent with the optimal hydrophilic-lipophilic balance of hydrocarbon, at which its emulsification occurs. Research application field. In this paper, the effect of mass transfer between the aqueous and hydrocarbon phases on the stabilization of foam in contact with hydrocarbons is investigated. The results obtained can be used for scientific and educational purposes in the study of the physicochemical properties of air-mechanical foam. Conclusions. It has been experimentally shown that the intensification of mass transfer contributes to a more intensive formation of an emulsion, which helps to stabilize the foam. All other things being equal, a foam more stable on the surface of hydrocarbons makes it possible to obtain a foaming agent, which in this system exhibits the properties not only of a foaming agent, but also of a good emulsifier.
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Pang, Xiongqi, Zhenxue Jiang, Shengjie Zuo e Ian Lerche. "Dynamics of Hydrocarbon Expulsion from Shale Source Rocks". Energy Exploration & Exploitation 23, n. 5 (ottobre 2005): 333–55. http://dx.doi.org/10.1260/014459805775992735.
Testo completoAbstract (sommario):
Expulsion of hydrocarbons from a shale source rock can be divided in four stages. In the first stage, only a small amount of hydrocarbons can be expelled in water solution and by diffusion. Compaction and hydrocarbon concentration gradient are the major driving forces, whereas their corresponding hydrocarbon expulsion amounts make up 30% and 70% to the total, respectively. In the second stage, in addition to transport by water solution and by diffusion, source rocks expel a large quantity of gas in free phase. In the third stage, the most important feature is that source rocks expel oil as a separate phase and gas in oil solution. Hydrocarbon expulsion by diffusion through the source rock organic network, dehydration of clay minerals, and thermal expansion of fluids and rocks are the three major driving forces in the second and the third stages, whereas the corresponding hydrocarbon expulsion accounts for 40–60%, 10–20%, and 5–10%, respectively, of the total amount expelled. In the fourth stage, source rocks mainly expel dry gas as a free phase. Volume expansion of kerogen products and capillary force are the two major driving forces for hydrocarbon expulsion. The expulsion accounts for 60% and 30% to the total gas expulsion of this stage, respectively, for each driving force. Hydrocarbon expulsion, including the hydrocarbon expulsion threshold (HET), the relative phases and the dynamics, are controlled by two factors: the hydrocarbon generation amount, and the ability of source rocks to retain hydrocarbons. Source rocks cross the HET and begin to expel a large quantity of hydrocarbons when the generated hydrocarbons have met all of the needs for hydrocarbon retention. HET is divides the processes of hydrocarbon expulsion into the various four stages.
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Bekturova, Assemgul, Zhannur Markhametova e Zhaksylyk Masalimov. "Plasmids Role in Survival of Acinetobacter calcoaceticus A1 Exposed to UV-Radiation and Hydrocarbons". Advanced Materials Research 905 (aprile 2014): 151–55. http://dx.doi.org/10.4028/www.scientific.net/amr.905.151.
Testo completoAbstract (sommario):
The role of plasmids in hydrocarbon-degrading bacteriaAcinetobacter calcoaceticus A1survival to UV-radiation and hydrocarbons was studied. Natural plasmids-containingA. calcoaceticus A1showed high resistance to UV-radiation.A. calcoaceticus A1showed active growth under exposed to UV-radiation for up to 30 minutes. Combined effects of UV-radiation and petroleum hydrocarbons did not considerably reduce the growth of strains. It was shown a stimulating effect of UV-radiation on the growth curves of strains ofA. calcoaceticus A1. Constructed recombinant strain (E.coli XL blueRec) showed the ability to grow on medium with addition petroleum hydrocarbons. Combined effects of UV-radiation and petroleum hydrocarbons have had a negative effect on the growth ofE.coli XL blueRec. Thus, results showed that the plasmid DNA of natural hydrocarbon-degrading bacteriaA. calcoaceticus A1may contain genes of microbial resistance to UV - radiation and petroleum hydrocarbons.
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Lopez, Eric Sanchez, Temidayo Oluyomi Elufisan, Patricia Bustos, Claudia Paola Mendoza Charles, Alberto Mendoza-Herrera e Xianwu Guo. "Complete Genome Report of a Hydrocarbon-Degrading Sphingobium yanoikuyae S72". Applied Sciences 12, n. 12 (18 giugno 2022): 6201. http://dx.doi.org/10.3390/app12126201.
Testo completoAbstract (sommario):
Sphingobium yanoikuyae S72 was isolated from the rhizosphere of sorghum plant in Mexico and we evaluated its survival and role in the degradation of some selected monoaromatic hydrocarbons and polycyclic aromatic hydrocarbons (PAHs) using minimal medium (Bushnell Hass medium (BH)) in which each of the hydrocarbons (naphthalene, phenanthrene, xylene, toluene, and biphenyl) served as sole carbon source. Gas column chromatography–mass spectrometry analysis was used to evaluate the effect of S72’s growth in the medium with the hydrocarbons. The genome of the S72 was sequenced to determine the genetic basis for the degradation of the selected hydrocarbon in S72. The genome was assembled de novo with Spades assembler and Velvet assembler and the obtained contigs were reduced to 1 manually using Consed software. Genome annotation was carried out Prokka version 1.12, and gene calling and further annotation was carried out with NCBI PGAAP. Pangenome analysis and COG annotation were done with bacteria pangenome analysis tool (BPGA) and with PATRIC online server, respectively. S72 grew effectively in the culture medium with the hydrocarbon with concentration ranging from 20–100 mg/mL for each hydrocarbon tested. S72 degraded biphenyl by 85%, phenanthrene by 93%, naphthalene by 81%, xylene by 19%, and toluene by 30%. The sequenced S72 genome was reduced to 1 contig and genome analysis revealed the presence of genes essential for the degradation of hydrocarbons in S72. A total of 126 unique genes in S72 are associated with the degradation of hydrocarbons and xenobiotics. S72 grew effectively in the tested hydrocarbon and shows good degradation efficiency. S72 will therefore be a good candidate for bioremediation of hydrocarbon contaminated soil.
10
MERKISZ, Jerzy, e Stanisław RADZIMIRSKI. "The analysis of the methods of hydrocarbon emission measurement according to European vehicle emission legislation". Combustion Engines 136, n. 1 (1 febbraio 2009): 76–89. http://dx.doi.org/10.19206/ce-117223.
Testo completoAbstract (sommario):
The paper discusses the measurement methods of methane hydrocarbons, non-methane hydrocarbons and total hydrocarbons set forth in the European emission regulations pertaining to M and N vehicle types and their engines. A model for the determining of the concentration of the said hydrocarbons and mathematical formulas have been derived. The concentration of the hydrocarbons determined as per the standards and the actual hydrocarbon concentration have been compared. Based on the above, changes have been proposed in the methodology set forth in the regulations.
11
Gargouri, Boutheina, Najla Mhiri, Fatma Karray, Fathi Aloui e Sami Sayadi. "Isolation and Characterization of Hydrocarbon-Degrading Yeast Strains from Petroleum Contaminated Industrial Wastewater". BioMed Research International 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/929424.
Testo completoAbstract (sommario):
Two yeast strains are enriched and isolated from industrial refinery wastewater. These strains were observed for their ability to utilize several classes of petroleum hydrocarbons substrates, such asn-alkanes and aromatic hydrocarbons as a sole carbon source. Phylogenetic analysis based on the D1/D2 variable domain and the ITS-region sequences indicated that strains HC1 and HC4 were members of the generaCandidaandTrichosporon, respectively. The mechanism of hydrocarbon uptaking by yeast,Candida,andTrichosporonhas been studied by means of the kinetic analysis of hydrocarbons-degrading yeasts growth and substrate assimilation. Biodegradation capacity and biomass quantity were daily measured during twelve days by gravimetric analysis and gas chromatography coupled with mass spectrometry techniques. Removal ofn-alkanes indicated a strong ability of hydrocarbon biodegradation by the isolated yeast strains. These two strains grew on long-chainn-alkane, diesel oil, and crude oil but failed to grow on short-chainn-alkane and aromatic hydrocarbons. Growth measurement attributes of the isolates, usingn-hexadecane, diesel oil, and crude oil as substrates, showed that strain HC1 had better degradation for hydrocarbon substrates than strain HC4. In conclusion, these yeast strains can be useful for the bioremediation process and decreasing petroleum pollution in wastewater contaminated with petroleum hydrocarbons.
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Parnell, John, e Paul Eakin. "The replacement of sandstones by uraniferous hydrocarbons: significance for petroleum migration". Mineralogical Magazine 51, n. 362 (ottobre 1987): 505–15. http://dx.doi.org/10.1180/minmag.1987.051.362.05.
Testo completoAbstract (sommario):
AbstractHydrocarbons (bitumens sensu lato) in sandstones have been recorded in several instances to have partially replaced their host rock, including quartz grains. Many replacive hydrocarbons are uranium-rich: associated non-uraniferous hydrocarbons are not replacive. Uranium is transported as carbonate complexes, which may be decomposed by organic acids to yield UO22+ ions and CO2. The UO22+ will be absorbed onto hydrocarbons before reduction to a mineral phase, generally uraninite; and the CO2 may be aggressive towards the silicate grains of the host sandstone. Accretionary nodules of replacive uraniferous hydrocarbon in red beds (e.g. at the cores of reduction spots) can provide valuable information about petroleum migration. They occur particularly in the vicinity of faults, and may record the interactions between metal-rich groundwaters and hydrocarbons leaking along a fault from an underlying reservoir. A trial study in Devonian sandstones of Easter Ross successfully traced a hydrocarbon-bearing sandstone reservoir from an occurrence of uraniferous hydrocarbon nodules.
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Mansurov, Z., Y. O. Doszhanov, Y. K. Ongarbaev, N. Sh Akimbekov e A. A. Zhubanova. "The Evaluation of Process of Bioremediation of Oil-Polluted Soils by Different Strains of Pseudomonas". Advanced Materials Research 647 (gennaio 2013): 363–67. http://dx.doi.org/10.4028/www.scientific.net/amr.647.363.
Testo completoAbstract (sommario):
The determination of content hydrocarbon of diesel fuels and individual hydrocarbons in oil-polluted soil before and after bioremediation by oil-oxidational microorganisms was carried out by method of chromato-mass-spectrometry. It has been shown that changes in composition hydrocarbons of diesel fuels and individual hydrocarbons in soil observe during growth of microorganisms on this soil.
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Malysheva, Anna. "Calculation of a two-phase system of a liquified hydrocarbon gas". E3S Web of Conferences 135 (2019): 04003. http://dx.doi.org/10.1051/e3sconf/201913504003.
Testo completoAbstract (sommario):
Liquefied hydrocarbon gases are a mixture of chemical compounds, consisting mainly of hydrogen and carbon with different molecular structures. The main components of liquefied hydrocarbon gases are propane and butane, containing lighter hydrocarbons (methane and ethane) and heavier ones (pentane) in the form of impurities. All of these components are saturated hydrocarbons. The composition of liquefied hydrocarbon gases can also include unsaturated hydrocarbons: ethylene, propylene, butylene. Butane-butylenes may be present as isomeric compounds (isobutane and isobutylene). When designing and operating liquefied petroleum gas systems, it is necessary to take into account the external equilibrium between the liquid and the gas. The paper analyzes the change in the ratio of components, in which the relative content of lighter hydrocarbons will decrease, while the content of heavier ones will increase. With an intensive flow of gas, the temperature of the liquid will drop sharply, estimation will be disturbed, and the vessel will freeze. Therefore, when operating balloon installations, it is very important to consider safety issues that are associated with containers’ filling, as well as with the change in the composition of hydrocarbon gases mixture. The discussed issues related to the calculation of a two-phase system of liquefied hydrocarbon gas can improve the operating conditions of the systems.
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Doszhanov, Ye O., Z. A. Mansurov, Ye K. Ongarbaev, Ye Tileuberdi e A. A. Zhubanova. "The Study of Biodegradation of Diesel Fuels by Different Strains of Pseudomonas". Applied Mechanics and Materials 467 (dicembre 2013): 12–15. http://dx.doi.org/10.4028/www.scientific.net/amm.467.12.
Testo completoAbstract (sommario):
The analysis of diesel fuels hydrocarbon composition before and after biodegradation is carried out by the methods of photocolorimetry. It was determinated, that the hydrocarbon composition of the diesel fuels is changed on influence of microorganisms. It has been shown that changes in composition hydrocarbons of diesel fuels and individual hydrocarbons in soil observe during growth of microorganisms on this soil.
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Mahmud, Tasiu, Ibrahim Alhaji Sabo, Zakari Nuhu Lambu, Dauda Danlami e Adamu Abdullahi Shehu. "Hydrocarbon Degradation Potentials of Fungi: A Review". Journal of Environmental Bioremediation and Toxicology 5, n. 1 (5 agosto 2022): 50–56. http://dx.doi.org/10.54987/jebat.v5i1.681.
Testo completoAbstract (sommario):
One of the serious problems affecting the environment nowadays is petroleum hydrocarbon contaminations resulting from the activities in the oil and gas sector, these include: oil-spill, tank leakage, lubrication, petroleum exploitation, transportation, and services. Various techniques including mechanical and chemical methods have been employed for the bioremediation and degradation of hydrocarbons pollutants from the environments, however, some of these methods are generally expensive and may have detrimental effects on the environment, hence bioremediation is the alternative solution to hydrocarbon pollutants. Among microorganisms used in bioremediation technology nowadays, fungi are efficient, reliable, cost-effective, and environmentally friendly that can be used to cleanup and detoxify hydrocarbons contaminants from the environment viz; soil, water, and sediments. Bioremediation using fungi ensures the complete degradation and mineralization of petroleum hydrocarbon contaminants into carbon dioxide, water, inorganic compounds, and cell biomass. This review focuses on the potentials of fungi in the bioremediation of total petroleum hydrocarbons including the polycyclic aromatic hydrocarbons (PAHs). We reviewed and discussed current approaches in the bioremediation of hydrocarbon including the mechanisms of fungal bioremediation of hydrocarbon, which involves biosurfactants production and the use of fungal enzymes in the degradation of hydrocarbon pollutants. In general, fungi are more efficient and effective in the removal of hydrocarbon contaminants from the environments viz., water, soil, and sediments. However, the potentiality of fungi has not been exploited fully, hence further studies are recommended especially in the current genomic and proteomic era.
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Meng, Qingqiang, Jiajun Jing, Jingzhou Li, Dongya Zhu, Ande Zou, Lunju Zheng e Zhijun Jin. "New exploration strategy in igneous petroliferous basins – Enlightenment from simulation experiments". Energy Exploration & Exploitation 36, n. 4 (11 marzo 2018): 971–85. http://dx.doi.org/10.1177/0144598718758338.
Testo completoAbstract (sommario):
There are two kinds of relationships between magmatism and the generation of hydrocarbons from source rocks in petroliferous basins, namely: (1) simultaneous magmatism and hydrocarbon generation, and (2) magmatism that occurs after hydrocarbon generation. Although the influence of magmatism on hydrocarbon source rocks has been extensively studied, there has not been a systematic comparison between these two relationships and their influences on hydrocarbon generation. Here, we present an overview of the influence of magmatism on hydrocarbon generation based on the results of simulation experiments. These experiments indicate that the two relationships outlined above have different influences on the generation of hydrocarbons. Magmatism that occurred after hydrocarbon generation contributed deeply sourced hydrogen gas that improved liquid hydrocarbon productivity between the mature and overmature stages of maturation, increasing liquid hydrocarbon productivity to as much as 451.59% in the case of simulation temperatures of up to 450°C during modelling where no hydrogen gas was added. This relationship also increased the gaseous hydrocarbon generation ratio at temperatures up to 450°C, owing to the cracking of initially generated liquid hydrocarbons and the cracking of kerogen. Our simulation experiments suggest that gaseous hydrocarbons dominate total hydrocarbon generation ratios for overmature source rocks, resulting in a change in petroleum accumulation processes. This in turn suggests that different exploration strategies are warranted for the different relationships outlined above. For example, simultaneous magmatism and hydrocarbon generation in an area means that exploration should focus on targets likely to host large oilfields, whereas in areas with magmatism that post-dates hydrocarbon generation the exploration should focus on both oil and gas fields. In addition, exploration strategies in igneous petroliferous basins should focus on identifying high-quality reservoirs as well as determining the relationship between magmatism and initial hydrocarbon generation.
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Tan, Yew Ai, e Ainte Kuntom. "Hydrocarbons m Crude Palm Kernel Oil". Journal of AOAC INTERNATIONAL 77, n. 1 (1 gennaio 1994): 67–73. http://dx.doi.org/10.1093/jaoac/77.1.67.
Testo completoAbstract (sommario):
Abstract The sources of hydrocarbons in crude palm kernel oil were investigated by a series of laboratory-controlled oil extractions of kernels of varying quality. Site examinations of palm kernel-crushing plants were also conducted to determine possible sources of hydrocarbon contamination of palm kernels throughout the process of kernel extraction. Parallel to these studies, a random survey of crude palm kernel oil (CPKO) produced by different kernel crushers was also carried out to determine the range of hydrocarbon concentrations in locally produced CPKO. This study showed that hydrocarbons can be picked up from sources such as glassware, extracting apparatus, and plastic containers and stoppers. Extraction of oil from low-quality kernels that were both moldy and rancid, broken kernels, and kernels plus added shells also resulted in a higher hydrocarbon level in the final CPKO. Overheating and cooking of the kernels before extraction also contributed to the overall hydrocarbon content. The random survey of hydrocarbon level showed a range of 0.6–7.1 ppm.
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Truskewycz, Adam, Taylor D. Gundry, Leadin S. Khudur, Adam Kolobaric, Mohamed Taha, Arturo Aburto-Medina, Andrew S. Ball e Esmaeil Shahsavari. "Petroleum Hydrocarbon Contamination in Terrestrial Ecosystems—Fate and Microbial Responses". Molecules 24, n. 18 (19 settembre 2019): 3400. http://dx.doi.org/10.3390/molecules24183400.
Testo completoAbstract (sommario):
Petroleum hydrocarbons represent the most frequent environmental contaminant. The introduction of petroleum hydrocarbons into a pristine environment immediately changes the nature of that environment, resulting in reduced ecosystem functionality. Natural attenuation represents the single, most important biological process which removes petroleum hydrocarbons from the environment. It is a process where microorganisms present at the site degrade the organic contaminants without the input of external bioremediation enhancers (i.e., electron donors, electron acceptors, other microorganisms or nutrients). So successful is this natural attenuation process that in environmental biotechnology, bioremediation has developed steadily over the past 50 years based on this natural biodegradation process. Bioremediation is recognized as the most environmentally friendly remediation approach for the removal of petroleum hydrocarbons from an environment as it does not require intensive chemical, mechanical, and costly interventions. However, it is under-utilized as a commercial remediation strategy due to incomplete hydrocarbon catabolism and lengthy remediation times when compared with rival technologies. This review aims to describe the fate of petroleum hydrocarbons in the environment and discuss their interactions with abiotic and biotic components of the environment under both aerobic and anaerobic conditions. Furthermore, the mechanisms for dealing with petroleum hydrocarbon contamination in the environment will be examined. When petroleum hydrocarbons contaminate land, they start to interact with its surrounding, including physical (dispersion), physiochemical (evaporation, dissolution, sorption), chemical (photo-oxidation, auto-oxidation), and biological (plant and microbial catabolism of hydrocarbons) interactions. As microorganism (including bacteria and fungi) play an important role in the degradation of petroleum hydrocarbons, investigations into the microbial communities within contaminated soils is essential for any bioremediation project. This review highlights the fate of petroleum hydrocarbons in tertial environments, as well as the contributions of different microbial consortia for optimum petroleum hydrocarbon bioremediation potential. The impact of high-throughput metagenomic sequencing in determining the underlying degradation mechanisms is also discussed. This knowledge will aid the development of more efficient, cost-effective commercial bioremediation technologies.
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Dunmore, R. E., J. R. Hopkins, R. T. Lidster, J. D. Lee, M. J. Evans, A. R. Rickard, A. C. Lewis e J. F. Hamilton. "Diesel-related hydrocarbons can dominate gas phase reactive carbon in megacities". Atmospheric Chemistry and Physics Discussions 15, n. 6 (31 marzo 2015): 9541–71. http://dx.doi.org/10.5194/acpd-15-9541-2015.
Testo completoAbstract (sommario):
Abstract. Hydrocarbons are key precursors to two priority air pollutants, ozone and particulate matter. Those with two to seven carbons have historically been straightforward to observe and have been successfully reduced in many developed cities through air quality policy interventions. Longer chain hydrocarbons released from diesel vehicles are not considered explicitly as part of air quality strategies and there are few direct measurements of their gaseous abundance in the atmosphere. This study describes the chemically comprehensive and continuous measurements of organic compounds in a developed megacity (London), which demonstrate that on a seasonal median basis, diesel-related hydrocarbons represent only 20–30% of the total hydrocarbon mixing ratio but comprise more than 50% of the atmospheric hydrocarbon mass and are a dominant local source of secondary organic aerosols. This study shows for the first time that, 60% of the winter primary hydrocarbon hydroxyl radical reactivity is from diesel-related hydrocarbons and using the maximum incremental reactivity scale, we predict that they contribute up to 50% of the ozone production potential in London. Comparing real-world urban composition with regulatory emissions inventories in the UK and US highlights a previously unaccounted for but, very significant under-reporting of diesel related hydrocarbons; an underestimation of a factor ~ 4 for C9 species rising to a factor of over 70 for C12 during winter. These observations show that hydrocarbons from diesel vehicles can dominate gas phase reactive carbon in cities with high diesel fleet fractions. Future control of urban particulate matter and ozone in such locations requires a shift in policy focus onto gas phase hydrocarbons released from diesels as this vehicle type continues to displace gasoline world-wide.
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Dunmore, R. E., J. R. Hopkins, R. T. Lidster, J. D. Lee, M. J. Evans, A. R. Rickard, A. C. Lewis e J. F. Hamilton. "Diesel-related hydrocarbons can dominate gas phase reactive carbon in megacities". Atmospheric Chemistry and Physics 15, n. 17 (7 settembre 2015): 9983–96. http://dx.doi.org/10.5194/acp-15-9983-2015.
Testo completoAbstract (sommario):
Abstract. Hydrocarbons are key precursors to two priority air pollutants, ozone and particulate matter. Those with two to seven carbons have historically been straightforward to observe and have been successfully reduced in many developed cities through air quality policy interventions. Longer chain hydrocarbons released from diesel vehicles are not considered explicitly as part of air quality strategies and there are few direct measurements of their gaseous abundance in the atmosphere. This study describes the chemically comprehensive and continuous measurements of organic compounds in a developed megacity (London), which demonstrate that on a seasonal median basis, diesel-related hydrocarbons represent only 20–30 % of the total hydrocarbon mixing ratio but comprise more than 50 % of the atmospheric hydrocarbon mass and are a dominant local source of secondary organic aerosols. This study shows for the first time that 60 % of the winter primary hydrocarbon hydroxyl radical reactivity is from diesel-related hydrocarbons and using the maximum incremental reactivity scale, we predict that they contribute up to 50 % of the ozone production potential in London. Comparing real-world urban composition with regulatory emissions inventories in the UK and US highlights a previously unaccounted for, but very significant, under-reporting of diesel-related hydrocarbons; an underestimation of a factor ~4 for C9 species rising to a factor of over 70 for C12 during winter. These observations show that hydrocarbons from diesel vehicles can dominate gas phase reactive carbon in cities with high diesel fleet fractions. Future control of urban particulate matter and ozone in such locations requires a shift in policy focus onto gas phase hydrocarbons released from diesels as this vehicle type continues to displace gasoline world-wide.
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Gurov, Yuri P., Evgeny О. Zemlianskii, Andrey G. Mozyrev e Slavik G. Agaev. "PARAMETERS CRYSTALLIZATION PROCESSES AND SOLID PETROLEUM HYDROCARBONS DISSOLUTION". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 63, n. 6 (13 maggio 2020): 90–94. http://dx.doi.org/10.6060/ivkkt.20206306.6181.
Testo completoAbstract (sommario):
In the proposed work, the experimental data on the processes of crystallization and different nature waxy hydrocarbons recrystallization in hydrocarbon solvents have been compared. T-1 technical paraffin (GOST 23683-89) with the melting point of 54 °С and ceresin-80 (GOST 2488-79) with the dropping temperature of 80 °C have been used. РТ-1 kerosene (GOST 10227-86) and de-waxed oil of fraction 420-490 °С have been used as hydrocarbon solvents. The experimental data on crystallization and recrystallization processes of paraffin wax with a melting temperature of 54 ºC and ceresin with a dropping temperature of 80 °C in kerosene and dewaxed oil are presented in this paper. It is shown that chemical structure has the main influence on the processes of crystallization and recrystallization of solid petroleum hydrocarbons. An exceedance of solid hydrocarbons solution temperatures tр above their cloud points tп has been observed which is explained by hysteretic processes. The temperature difference Δt = tр- tп depends on the solid hydrocarbons nature and their content in solvents. Wax solutions in kerosene have higher values Δt relative to ceresin solutions in kerosene, which can be explained by the difference in chemical structure of solid hydrocarbons. With the increase in solid hydrocarbons content in their solvents due to the differences in solid hydrocarbons diffusion rate, Δt decreases. The discovered regularities of solid hydrocarbons crystallization and recrystallization should be taken into account in the processes of paraffin oil production, transportation and processing.
23
Pang, Xiongqi, Ian Lerche, Haiyan Zhou e Zhengxue Jiang. "Hydrocarbon Accumulation Control by Predominant Migration Pathways". Energy Exploration & Exploitation 21, n. 3 (giugno 2003): 167–86. http://dx.doi.org/10.1260/014459803769520034.
Testo completoAbstract (sommario):
Geological analysis and physical analogy experiments indicate that, under geological conditions, hydrocarbon tends to migrate along a path of least resistance and attempt to follow the largest buoyancy component. There are four generalized modes of possible transport. First, hydrocarbons tends to migrate along the pathways with high porosity and permeability, and with a large grade difference relative to surrounding rocks (grade difference predominance); second, hydrocarbons tends to migrate in the opposite direction in overlying formations to the nadir of the sedimentation centre (divided syncline predominance); third, hydrocarbons tends to migrate in the direction of lower fluid pressure (fluid pressure predominance); fourth, hydrocarbons tends to migrate in the direction vertical to buoyancy (flow direction predominance). This paper reports on field observations in the Daqing oilfield area of China and also on physical analog experiments used to illuminate the four basic modes of transport. Under geological conditions, the hydrocarbon migration pathways are controlled by these four basic modes, which can be used to predict the directions of hydrocarbons migration and select favourable exploration locations.
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Irene, Desy Shintya, I. Gusti Ngurah Putra Dirgayusa e Ni Luh Putu Ria Puspitha. "Identifikasi Bakteri yang Berpotensi Mendegradasi Hidrokarbon dari Substrat Mangrove dengan Tekstur Berpasir, Berlumpur, dan Tanah Liat". Journal of Marine and Aquatic Sciences 6, n. 2 (3 dicembre 2020): 175. http://dx.doi.org/10.24843/jmas.2020.v06.i02.p4.
Testo completoAbstract (sommario):
Hydrocarbon compounds are commonly found in petroleum and gas, plastics, paraffins, and bitumen. Although hydrocarbons are the constituent compounds of the materials used by humans, some hydrocarbon compounds have adverse effects on the environment and humans. One alternative to solve this problem is by using Mangrove substrate in Ngurah Rai Forest Park, Bali which is the habitat of several species of bacteria that interfere with degrading hydrocarbons. This study aims to identify the bacteria that interfere with hydroxon, through macroscopic observation, microscopic and biochemical tests. The results of this study showed six isolate bacteria that interfere with degrading hydrocarbon compounds. Six isolates were from the genus Alcaligenes of sandy mangroves, Pseudomonas and Bacillus genus from muddy mangrove soils, and two genera of bacteria from clay substrate namely Alcaligenes and Bacillus. The disturbing bacterial proposals underlying the highest hydrocarbon were found on clay with a value of 58.51% and the lowest on sandy substrates, with a discount value of 0%. The highest value on the clay substrate can cause the clay substrate to bind hydrocarbons, air, nutrients, and oxygen higher than sandy and muddy soils. The lowest value on sandy substrate can lead to low bacterial capability and it takes a long time for bacteria to degrade hydrocarbons.
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Ohwovorione, Lucky, e Onoriode Emoyan. "CONCENTRATIONS AND ASSOCIATED RISK OF SELECTED ALIPHATIC HYDROCARBONS IN SEDIMENTS FROM RIVER ETHIOPE, SOUTHERN NIGERIA". Nigerian Journal of Science and Environment 22, n. 1 (30 aprile 2024): 194–207. http://dx.doi.org/10.61448/njse2212415.
Testo completoAbstract (sommario):
The contamination of aquatic ecosystems by hydrocarbon compounds poses severe environmental and human health concerns. Hence this study aimed to investigate the concentrations and associated risk of selected aliphatic hydrocarbons in sediments from the River Ethiope, an important water resource in Nigeria. A comprehensive sampling was conducted, collecting sediment samples at various locations (Umuaja, Obinoba, Abraka, Eku, Okpara, Aghalokpe, and Sapele) along the river. The samples were analyzed using gas chromatography (GC) to quantify the concentrations of hydrocarbons, with a specific focus on aliphatic hydrocarbons. These compounds are known for their potential adverse effects on human health and the environment. From the results obtained in this study, the total concentrations of Aliphatic compounds at various site from sites ranged from 10897 -316783 μg/kg in (C8-C39), with Okpara containing the highest concentration and Eku with the lowest concentration. Hydrocarbon C36was not detected in Umuaja while hydrocarbon C37was not discovered in Aghalokpe, Okpara-Waterside and Sapele. Also, hydrocarbon C10, C11and C12was not detected in Okpara-Waterside and Sapele. There were significant differences (p<0.05) in all hydrocarbons detected among the different sampling locations except in hydrocarbon C34which showed no significant different (p>0.05). The outcome of this study from carbon preference index (CPI) reveals that the major source of hydrocarbon contamination is associated with petroleum activities and have contributed valuable information for environmental monitoring programs, policymaking, and decision-making processes aimed at safeguarding water quality and mitigating the potential detrimental effects of hydrocarbon contamination in similar aquatic environments.
26
Malina, I., K. Malins, M. Strods-Vavilovs e V. Uleiskis. "Renewable Hydrocarbon Production via Rapeseed Oil Hydrotreatment Over Palladium Catalysts". IOP Conference Series: Earth and Environmental Science 897, n. 1 (1 novembre 2021): 012012. http://dx.doi.org/10.1088/1755-1315/897/1/012012.
Testo completoAbstract (sommario):
Abstract The effect of SiO2-Al2O3 (Pd5%/SA), activated carbon (Pd5%/C) and Al2O3 (Pd5%/A) supported palladium (5%) catalysts on renewable hydrocarbon synthesis via rapeseed oil hydrotreatment was investigated. The hydrotreatment experiments were carried out in solvent free medium under initial H2 pressure 100 bar and at 340 °C temperature for 120 min using catalyst amount 5%. Gas chromatography-mass spectrometry (GC/MS) analysis were used for estimation of hydrocarbon content in the obtained samples. Pd5%/SA catalyst provided complete conversion of rapeseed oil into marketable liquid renewable hydrocarbons without presence of oxygen containing substances under studied hydrotreatment conditions. Moreover, all tested Pd catalysts gave narrow range of linear saturated hydrocarbons (n-C15-C19). Pd5%/C and Pd5%/A catalysts gave partial feedstock conversion into hydrocarbons even in long residence time. Overall liquid hydrocarbon yields were from 55.3% to 82.3%.
27
Wang, Zhendi, e Mervin F. Fingas. "Identification of the Source(s) of Unknown Spilled Oils". International Oil Spill Conference Proceedings 1999, n. 1 (1 marzo 1999): 211–18. http://dx.doi.org/10.7901/2169-3358-1999-1-211.
Testo completoAbstract (sommario):
ABSTRACT The ability to unambiguously identify spilled oils and petroleum products in complex contaminated environmental samples and to link them to the known sources is extremely important in settling questions of environmental impacts and liability. This paper will briefly review advanced chemical fingerprinting and data interpreting techniques used to identify sources of spilled oils. The chemical fingerprinting techniques discussed include pattern recognition evaluation of target petroleum hydrocarbon distributions; determination of major oil components and hydrocarbon groups; determination of diagnostic ratios of source-specific marker compounds such as PAHs and biomarkers; target PAH isomer analysis; and carbon isotopic ratio analysis. Methods for distinguishing biogenic and pyrogenic hydrocarbons from petrogenic hydrocarbons are also addressed. Several examples are presented to illustrate approaches to identifying and allocating multiple sources of hydrocarbons in complex hydrocarbon mixtures using these advanced chemical fingerprinting techniques.
28
Thomas, Melissa L., e Leigh W. Simmons. "Short-term phenotypic plasticity in long-chain cuticular hydrocarbons". Proceedings of the Royal Society B: Biological Sciences 278, n. 1721 (2 marzo 2011): 3123–28. http://dx.doi.org/10.1098/rspb.2011.0159.
Testo completoAbstract (sommario):
Cuticular hydrocarbons provide arthropods with the chemical equivalent of the visually extravagant plumage of birds. Their long chain length, together with the number and variety of positions in which methyl branches and double bonds occur, provide cuticular hydrocarbons with an extraordinary level of information content. Here, we demonstrate phenotypic plasticity in an individual's cuticular hydrocarbon profile. Using solid-phase microextraction, a chemical technique that enables multiple sampling of the same individual, we monitor short-term changes in cuticular hydrocarbon profiles of individual crickets, Teleogryllus oceanicus , in response to a social challenge. We experimentally manipulate the dominance status of males and find that dominant males, on losing fights with other dominant males, change their hydrocarbon profile to more closely resemble that of a subordinate. This result demonstrates that cuticular hydrocarbons can be far more responsive to changes in social dominance than previously realized.
29
Ponomareva, Anna L., Alena I. Eskova, Renat B. Shakirov, Nadezhda S. Syrbu, Aleksey A. Legkodimov e Roman A. Grigorov. "Groups of Geomicrobiological Indicators Are Spread across Gas-Hydrate and Non-Gas-Hydrate Areas in the Northern Part of the Sea of Japan". Biology 11, n. 12 (12 dicembre 2022): 1802. http://dx.doi.org/10.3390/biology11121802.
Testo completoAbstract (sommario):
The bioindication of oil and gas fields is a field of geomicrobiology that is mainly devoted to the detection of hydrocarbon-oxidizing microbial indicator species or functional genes in total DNA. However, it appears promising to use the physiological properties of microorganisms detection deposit type of hydrocarbons, in particular their ability to oxidize hydrocarbons under aerobic and anaerobic conditions. In this study, the most promising approach in this area was the method used for assessing the anaerobic degradation of hydrocarbons. When comparing molecular genetics and cultured methods of bioindication, it can be concluded that molecular biomarkers of functional genes for the anaerobic destruction of hydrocarbons (masD) make it possible to separate areas with traditional and gas-hydrate types of deposits. Using cultured methods, we found that representatives of the Nocardiaceae family of the phylum Actinomycetota were tied to the areas where gas hydrates were found. The ability of aerobic and facultative anaerobic hydrocarbon-oxidizing microorganisms to anaerobically utilize hydrocarbons was determined with cultured methods. For the first time, this ability was revealed for the genera Stenotrophomonas, Psychrobacter, Micrococcus and Peribacillus. The wide distribution of this ability that we found in strains isolated from both study regions suggests its prominent role in the destruction of hydrocarbons in marine sediments.
30
YEN, T. F., J. F. KUO e G. V. CHILINGARIAN. "Note on Hydrocarbon 2. Naphthenic Hydrocarbons". Energy Sources 9, n. 2 (gennaio 1987): 125–32. http://dx.doi.org/10.1080/00908318708908689.
Testo completo
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Taylor, Nicole M., Courtney R. A. Toth, Victoria Collins, Paolo Mussone e Lisa M. Gieg. "The Effect of an Adsorbent Matrix on Recovery of Microorganisms from Hydrocarbon-Contaminated Groundwater". Microorganisms 9, n. 1 (1 gennaio 2021): 90. http://dx.doi.org/10.3390/microorganisms9010090.
Testo completoAbstract (sommario):
The microbial degradation of recalcitrant hydrocarbons is an important process that can contribute to the remediation of oil and gas-contaminated environments. Due to the complex structure of subsurface terrestrial environments, it is important to identify the microbial communities that may be contributing to biodegradation processes, along with their abilities to metabolize different hydrocarbons in situ. In this study, a variety of adsorbent materials were assessed for their ability to trap both hydrocarbons and microorganisms in contaminated groundwater. Of the materials tested, a porous polymer resin (Tenax-TA) recovered the highest diversity of microbial taxa in preliminary experiments and was selected for additional (microcosm-based) testing. Oxic and anoxic experiments were prepared with groundwater collected from a contaminated aquifer to assess the ability of Tenax-TA to adsorb two environmental hydrocarbon contaminants of interest (toluene and benzene) while simultaneously providing a surface for microbial growth and hydrocarbon biodegradation. Microorganisms in oxic microcosms completely degraded both targets within 14 days of incubation, while anoxically-incubated microorganisms metabolized toluene but not benzene in less than 80 days. Community analysis of Tenax-TA-associated microorganisms revealed taxa highly enriched in sessile hydrocarbon-degrading treatments, including Saprospiraceae, Azoarcus, and Desulfoprunum, which may facilitate hydrocarbon degradation. This study showed that Tenax-TA can be used as a matrix to effectively trap both microorganisms and hydrocarbons in contaminated environmental systems for assessing and studying hydrocarbon-degrading microorganisms of interest.
32
Parinos, C., A. Gogou, I. Bouloubassi, R. Pedrosa-Pàmies, I. Hatzianestis, A. Sanchez-Vidal, G. Rousakis, D. Velaoras, G. Krokos e V. Lykousis. "Occurrence, sources and transport pathways of natural and anthropogenic hydrocarbons in deep-sea sediments of the eastern Mediterranean Sea". Biogeosciences 10, n. 9 (24 settembre 2013): 6069–89. http://dx.doi.org/10.5194/bg-10-6069-2013.
Testo completoAbstract (sommario):
Abstract. Surface sediments collected from deep basins (1018–4087 m depth) of the eastern Mediterranean Sea (Ionian Sea, southern Aegean Sea and northwestern Levantine Sea) were analyzed for aliphatic and polycyclic aromatic hydrocarbons as tracers of natural and anthropogenic inputs. Concentrations of total aliphatic hydrocarbons, n-alkanes and the unresolved complex mixture (UCM) of aliphatic hydrocarbons varied significantly, ranging from 1.34 to 49.2 μg g−1, 145 to 4810 ng g−1 and 0.73 to 36.7 μg g−1, respectively, while concentrations of total polycyclic aromatic hydrocarbons (PAHs) ranged between 11.6 and 223 ng g−1. Molecular profiles of determined hydrocarbons reflect a mixed contribution from both natural and anthropogenic sources in deep-sea sediments of the eastern Mediterranean Sea, i.e., terrestrial plant waxes, degraded petroleum products, unburned fossil fuels and combustion of grass, wood and coal. Hydrocarbon mixtures display significant variability amongst sub-regions, reflecting differences in the relative importance of inputs from various sources and phase associations/transport pathways of individual hydrocarbons that impact on their overall distribution and fate. Hydrocarbon concentrations correlated significantly with the organic carbon content of sediments, indicating that the latter exerts an important control on their transport and ultimate accumulation in deep basins. Additionally, water masses' circulation characteristics also seem to influence the regional features and distribution patterns of hydrocarbons. Our findings highlight the role of deep basins/canyons as repositories of both natural and anthropogenic chemical species.
33
Tian, Shansi, Zhentao Dong, Bo Liu, Haitao Xue, Valentina Erastova, Min Wang e Haiyang Yan. "Characteristics of Gaseous/Liquid Hydrocarbon Adsorption Based on Numerical Simulation and Experimental Testing". Molecules 27, n. 14 (19 luglio 2022): 4590. http://dx.doi.org/10.3390/molecules27144590.
Testo completoAbstract (sommario):
Hydrocarbon vapor adsorption experiments (HVAs) are one of the most prevalent methods used to evaluate the proportion of adsorbed state oil, critical in understanding the recoverable resources of shale oil. HVAs have some limitations, which cannot be directly used to evaluate the proportion of adsorbed state oil. The proportion of adsorbed state oil from HVA is always smaller than that in shale oil reservoirs, which is caused by the difference in adsorption characteristics of liquid and gaseous hydrocarbons. The results of HVA need to be corrected. In this paper, HVA was conducted with kaolinite, an important component of shale. A new method is reported here to evaluate the proportion of adsorbed state oil. Molecular dynamics simulations (MDs) of gaseous/liquid hydrocarbons with the same temperature and pressure as the HVAs were used as a reference to reveal the errors in the HVAs evaluation from the molecular scale. We determine the amount of free state of hydrocarbons by HVAs, and then calculate the proportion of adsorbed state oil by the liquid hydrocarbon MD simulation under the same conditions. The results show that gaseous hydrocarbons adsorptions are monolayer at low relative pressures and bilayer at high relative pressures. The liquid hydrocarbons adsorption is multilayer adsorption. The adsorption capacity of liquid hydrocarbons is over 2.7 times higher than gaseous hydrocarbons. The new method will be more effective and accurate to evaluate the proportion of adsorbed state oil.
34
Doley, Ruby, e Manoj Barthakur. "Biotransformation of aromatic hydrocarbon: Naphthalene to Aliphatic Hydrocarbons through Staphylococcus pasteuri RD2". Annals of Plant Sciences 7, n. 5 (30 aprile 2018): 2247. http://dx.doi.org/10.21746/aps.2018.7.5.7.
Testo completoAbstract (sommario):
Aromatic hydrocarbons like naphthalene are common environmental pollutants of petrochemical waste. Microorganisms have been exploited since long back to clean up such pollutants by converting them in to either non- toxic or less toxic aromatic or aliphatic compounds. A bacterial strain have been isolated from oil sludge of Guwahati Refinery, Assam and was identified as Staphylococcus pasteuri RD2 (NCBI accession number MG680735) through 16srDNA sequence analysis and molecular phylogeny. The bacterial strain transforms Naphthalene, a common hazardous aromatic hydrocarbon found in petrochemical waste, into a number of less hazardous aliphatic hydrocarbons. Detection of compounds such as Decane, Dodecane, tetradecane, Hexadecane, Eicosane, and heptane by GC-MS analysis of naphthalene enrichment culture broth suggested that the bacterial strain was able to transform naphthalene in to different aliphatic hydrocarbons with less toxicity and having chain length of C7 to C20. It has also been depicted a pathway to obtain aliphatic hydrocarbons with higher caloric value from aromatic hydrocarbon waste.
35
Fan, Li, Xianhe Gong, Quanwei Lv, Denghui Bin e Li’Ao Wang. "Construction of Shale Gas Oil-Based Drilling Cuttings Degrading Bacterial Consortium and Their Degradation Characteristics". Microorganisms 12, n. 2 (2 febbraio 2024): 318. http://dx.doi.org/10.3390/microorganisms12020318.
Testo completoAbstract (sommario):
Oil-based drilling cuttings (OBDCs) contain petroleum hydrocarbons with complex compositions and high concentrations, which have highly carcinogenic, teratogenic, and mutagenic properties. In this study, three highly efficient petroleum hydrocarbon-degrading bacteria were screened from OBDCs of different shale gas wells in Chongqing, China, and identified as Rhodococcus sp. and Dietzia sp. Because of their ability to degrade hydrocarbons of various chain lengths, a new method was proposed for degrading petroleum hydrocarbons in shale gas OBDCs by combining different bacterial species. Results showed that the bacterial consortium, consisting of the three strains, exhibited the highest degradation rate for petroleum hydrocarbons, capable of degrading 74.38% of long-chain alkanes and 93.57% of short-chain alkanes, respectively. Moreover, the petroleum hydrocarbon degradation performance of the bacterial consortium in actual OBDCs could reach 90.60% in the optimal conditions, and the degradation kinetic process followed a first-order kinetic model. This study provides a certain technical reserve for the bioremediation of shale gas OBDCs.
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Nemirovskaya, I. A., V. D. Oneginа, A. P. Lisitzin e B. V. Konovalov. "Origin of hydrocarbons in suspended matter and bottom sediments near the Crimean peninsula". Доклады Академии наук 484, n. 5 (16 maggio 2019): 600–604. http://dx.doi.org/10.31857/s0869-56524845600-604.
Testo completoAbstract (sommario):
It was established that the content of hydrocarbons in the surface waters of the Feodosia Gulf fluctuated were varied a wide range (11–179 μg/l), and exceeded the MPC values for petroleum hydrocarbons in individual samples. The highest concentrations were observed in 2016. The composition of alkanes suggested their mixed (autochthonous and allochthonous) origin. The weathered petroleum hydrocarbons have been identified only in a few cases. In bottom sediments, the concentrations of hydrocarbons depended on their grain size distribution, and terrigenous alkanes were dominated in their composition. The oil and pyrogenic hydrocarbons’ pollution were established based on the composition of polycyclic aromatic hydrocarbons. In the open part of the Black Sea, southward the Crimean peninsula, the hydrocarbon content in surface waters and bottom sediments were at the level of background concentrations, and homologs of terrigenous origin dominated in their composition.
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Conway, Lewis J., e Andreas Hermann. "High Pressure Hydrocarbons Revisited: From van der Waals Compounds to Diamond". Geosciences 9, n. 5 (16 maggio 2019): 227. http://dx.doi.org/10.3390/geosciences9050227.
Testo completoAbstract (sommario):
Methane and other hydrocarbons are major components of the mantle regions of icy planets. Several recent computational studies have investigated the high-pressure behaviour of specific hydrocarbons. To develop a global picture of hydrocarbon stability, to identify relevant decomposition reactions, and probe eventual formation of diamond, a complete study of all hydrocarbons is needed. Using density functional theory calculations we survey here all known C-H crystal structures augmented by targeted crystal structure searches to build hydrocarbon phase diagrams in the ground state and at elevated temperatures. We find that an updated pressure-temperature phase diagram for methane is dominated at intermediate pressures by CH 4 :H 2 van der Waals inclusion compounds. We discuss the P-T phase diagram for CH and CH 2 (i.e., polystyrene and polyethylene) to illustrate that diamond formation conditions are strongly composition dependent. Finally, crystal structure searches uncover a new CH 4 (H 2 ) 2 van der Waals compound, the most hydrogen-rich hydrocarbon, stable between 170 and 220 GPa.
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Sater, Nabil Abdel, e A. Grigorov. "METHOD OF FORECASTING THE DIRECTION OF PROCESSING HYDROCARBONS". Integrated Technologies and Energy Saving, n. 1 (21 giugno 2022): 44–51. http://dx.doi.org/10.20998/2078-5364.2022.1.05.
Testo completoAbstract (sommario):
In the article it is offered to rationalize work of installations on processing of hydrocarbonic raw materials, at the expense of its classification on types, using criterion of forecasting (KP) of the direction of processing. This approach will generally contribute to the rational use of technological equipment, reducing the metal consumption of devices and processing schemes, reducing energy costs by recovering excess heat and reducing heat exchange with the environment, efficient use of pumping equipment. At the same time, the general culture of production will increase and the harmful load on the environment will be reduced. Experimental studies have shown that the relative dielectric constant (ε), kinematic viscosity (ν20, mm2 / s) and Conradson coking (хk,%) of hydrocarbons, significantly depend on its chemical and fractional composition. In view of this, the proposed CP should be based on the above indicators. Experimental studies have allowed determining certain limit values of KP in accordance with which, hydrocarbons can be attributed to a certain type: type 0 –; type 1, 2 –; type 3 –; type 4 –.
On the basis of the calculated values of KP, in the future, it is possible to develop rational schemes of technological processing of hydrocarbons, which will be related to the fuel, oil and combined direction (option). Depending on the needs of certain types of petroleum products, the target components obtained in the implementation of these schemes are hydrocarbon gases, motor and boiler fuels, lubricating oils, petroleum coke, bitumen, by-products – degradation gases, paraffin, resins and asphaltenes.
39
S., Mikhailov,, Brovko, R., Lakina, N. e Doluda, V. "Mixed Structure MFI-MORD Zeolite Deactivation in Micro Structured Fluid Conditions in Methanol to Hydrocarbons Transformation Reaction Study". Bulletin of Science and Practice, n. 1 (15 gennaio 2023): 10–16. http://dx.doi.org/10.33619/2414-2948/86/01.
Testo completoAbstract (sommario):
Microstructured reaction systems are attracting considerable attention from both the scientific and industrial communities due to their high efficiency, the ability to precisely control the technological processes, and the ability scale up processes. One of the positive effects of using microstructured reaction systems is a decrease in the diffusion coefficient, which in turn has a positive effect on the transfer rates of reactants and reaction products. This should lead to an increase in the reaction rate and a decrease in the deactivation of catalytic systems, if they are used. The article presents the results of studying the activity and stability of a mixed zeolite of the MFI-MORD type in a microreactor and traditional reaction system in the reaction of methanol transformation into hydrocarbons. When carrying out the process in a tubular reactor, an increase in temperature from 350℃ to 450℃ leads to an increase in the rate of formation of hydrocarbons from 0.08 kg(coal)/(kg(cat)×h) to 0.16 kg(Hydrocarbons)/(kg(cat) )×h), and the catalyst deactivation rate increases from 8×10−5 kg(Hydrocarbons)/(kg(Cat)*h) to 4×10−4 kg(Hydrocarbons)/(kg(Cat)×h). When using a microreactor, increasing the temperature from 350℃ to 450℃ leads to an increase in the rate of hydrocarbon production from 0.12 kg (Hydrocarbons)/(kg(Cat)×h) to 0.22 kg(Hydrocarbons)/(kg(Cat)×h), the catalyst deactivation rate also increases from 6×10−6 kg(Hydrocarbons)/(kg(Cat)×h) to 8×10−5kg(Hydrocarbons)/(kg(Cat)×h). Thus, in the case of using a microreactor, an increase in the rate of formation of hydrocarbons by 20-30% and a decrease in the rate of deactivation of the zeolite by 5-10 times are observed. An increase in the rate of the hydrocarbon formation reaction and a decrease in the rate of zeolite deactivation are probably the result of a decrease in diffuse inhibitions in the catalyst bed in the case of using microreactor systems.
40
Māliņš, Kristaps, Ilze Malina e Mara Legzdina. "The Synthesis of Renewable Hydrocarbons from Different Vegetable Oils and Soapstock by Hydrotreatment over High Metal Loading Supported Ni Catalyst". Key Engineering Materials 903 (10 novembre 2021): 81–86. http://dx.doi.org/10.4028/www.scientific.net/kem.903.81.
Testo completoAbstract (sommario):
The catalytic hydrotreatment of sunflower (SO), linseed (LO), coconut (CO), rapeseed (RO), and its soapstock derived acid oil (RS) over commercial Ni65%/SiO2-Al2O3 catalyst was investigated to evaluate utilization feasibility of various vegetable oil feedstocks with different fatty acid content, composition, and saturation for marketable hydrocarbon production. The active metal loading of catalyst was characterized by XRF and its textural properties by N2 sorption analysis. The hydrotreatment tests of different vegetable oils were carried out in solvent free medium, under initial H2 pressure 10 MPa, at operating temperature 340 oC, and residence time 15 min using catalyst amount 5%. GC-FID and GC-MS analysis were used for estimation of dominant n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, and other hydrocarbon contents in obtained samples. Under studied hydrotreatment conditions complete conversion of different vegetable oils into marketable liquid renewable hydrocarbons without presence of oxygen containing substances was achieved. Highly active Ni65%/SiO2-Al2O3 has remarkable selectivity to hydrocarbons produced by reaction pathways, where elimination of carbonyl groups occurs. The saturation of fatty acids in feedstock determines H2 consumption, but influence on produced hydrocarbon production is insignificant. Depending on the fatty acid composition different saturated linear hydrocarbons with wide range of carbon chain length C5-C19 and similar calorific value 47.16-47.34 MJ/kg were produced in process. Overall liquid hydrocarbon yields were from 44.6 % to 78.1 %. The highest overall liquid saturated linear hydrocarbon yield was observed for feedstock with high amount of long chain fatty acids – SO, LO, RO and RS. Pure hydrocarbons obtained from vegetable oils depending on hydrocarbon composition can be used in various areas.
41
Baek, Seunghwan, e I. Yucel Akkutlu. "Produced-Fluid Composition Redistribution in Source Rocks for Hydrocarbon-In-Place and Thermodynamic Recovery Calculations". SPE Journal 24, n. 03 (5 aprile 2019): 1395–414. http://dx.doi.org/10.2118/195578-pa.
Testo completoAbstract (sommario):
Summary Source rocks, such as organic-rich shale, consist of a multiscale pore structure that includes pores with sizes down to the nanoscale, contributing to the storage of hydrocarbons. In this study, we observed hydrocarbons in the source rock partition into fluids with significantly varying physical properties across the nanopore-size distribution of the organic matter. This partitioning is a consequence of the multicomponent hydrocarbon mixture stored in the nanopores, exhibiting a significant compositional variation by pore size—the smaller the pore size, the heavier and more viscous the hydrocarbon mixture becomes. The concept of composition redistribution of the produced fluids uses an equilibrium molecular simulation that considers organic matter to be a graphite membrane in contact with a microcrack that holds bulk-phase produced fluid. A new equation of state (EOS) was proposed to predict the density of the redistributed fluid mixtures in nanopores under the initial reservoir conditions. A new volumetric method was presented to ensure the density variability across the measured pore-size distribution to improve the accuracy of predicting hydrocarbons in place. The approach allowed us to account for the bulk hydrocarbon fluids and the fluids under confinement. Multicomponent fluids with redistributed compositions are capillary condensed in nanopores at the lower end of the pore-size distribution of the matrix (<10 nm). The nanoconfinement effects are responsible for the condensation. During production and pressure depletion, the remaining hydrocarbons become progressively heavier. Hence, hydrocarbon vaporization and desorption develop at extremely low pressures. Consequently, hydrocarbon recovery from these small pores is characteristically low.
42
Leonov, M. G., V. Yu Kerimov, R. N. Mustaev e Vu Nam Hai. "ON THE NATURE AND MECHANISM OF FORMATION OF HYDROCARBON DEPOSITS ON THE SHELF OF VIETNAM". Tikhookeanskaya Geologiya 39, n. 5 (2020): 3–16. http://dx.doi.org/10.30911/0207-4028-2020-39-5-3-16.
Testo completoAbstract (sommario):
The paper presents the results of the study of main factors determining conditions of formation and distribution of oil and gas deposits within the Cenozoic sedimentary cover and Precenozoic granite basement of the Vietnam shelf. The structural and tectonic model of the Kyulong basin constructed by the authors allows to reveal the conditions of formation of regional and local structures in the sedimentary cover containing hydrocarbon deposits; mechanisms of hydrocarbon traps emergence and hollow space (collectors); genesis of hydrocarbons, including the hydrocarbons existed in the basement rocks; the possible mechanism of migration and accumulation of hydrocarbons in the basement rocks. The traps which are real or potential reservoirs of hydrocarbons in the body of a crystal socle are widely developed. The structural and tectonic processes in the basement itself resulted in the development of positive morfostructures (domes, protrusions) the cores of which are made of disintegrated (granulated) rocks of a crystalline cap. In order to reconstruct the chronothermobaric conditions of occurrence and evolution of hydrocarbon generation centers and to restore the conditions of formation and distribution patterns of oil and gas accumulations on the shelf of Vietnam, three-dimensional modeling of generation and accumulation hydrocarbon systems was performed using the basin modeling technology and PetroMod software (Schlumberger, Ltd, USA). Studies of hydrocarbon biomarkers of oil fields in the Kyulong basin, including those located in the crystalline basement have shown the similarity of biomarker parameters of oil and organic matter, which demonstrates the organic nature of the oil fields of the basement on the shelf of Vietnam
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Pattanayak, Rojalin, Geetanjali Mishra, Chandan Singh Chanotiya, Prasant Kumar Rout, Chandra Sekhar Mohanty e Omkar. "Semiochemical profile of four aphidophagous Indian Coccinellidae (Coleoptera)". Canadian Entomologist 148, n. 2 (3 agosto 2015): 171–86. http://dx.doi.org/10.4039/tce.2015.45.
Testo completoAbstract (sommario):
AbstractThe emitted aliphatic hydrocarbon profile of four Indian Coccinellidae (Coleoptera), Coccinella septempunctata (Linnaeus) (C7), Coccinella transversalis Fabricius (Ct), Menochilus sexmaculatus (Fabricius) (Ms), and Propylea dissecta (Mulsant) (Pd) has been investigated by simple solvent-less headspace solid-phase microextraction (HS-SPME) technique coupled with gas chromatography and mass spectroscopy (GC-MS). Identified volatile and non-volatile compounds were confirmed by running corresponding standards and comparing with the National Institute of Standards and Technology library. Among the 56 identified aliphatic hydrocarbons, saturated aliphatic hydrocarbons were more in number than unsaturated ones. Among saturated hydrocarbons, methyl branched hydrocarbons were more in number in C7 and Ct than Ms and Pd. Menochilus sexmaculatus and Pd had higher percentages of unsaturated hydrocarbons than C7 and Ct. Among branched chain-hydrocarbons, mono-methylated saturated hydrocarbons were more in number than dimethylated saturated hydrocarbons. Further analysis of the semiochemical profile revealed a closeness between C7 and Ct, and between Ms and Pd. Quantitative analysis revealed that straight chain hydrocarbons form separate clusters to branched chain methylated hydrocarbons. This is the first attempt to identify the semiochemical profile of some Indian coccinellids using the headspace solid phase micro-extraction technique coupled with the gas chromatography-mass spectrometry technique. This report will be helpful for various chemotaxonomic studies of the species in the future.
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Kuyukina, Maria, Anastasiya Krivoruchko e Irina Ivshina. "Hydrocarbon- and metal-polluted soil bioremediation: progress and challenges". Microbiology Australia 39, n. 3 (2018): 133. http://dx.doi.org/10.1071/ma18041.
Testo completoAbstract (sommario):
The problem of soil contamination with petroleum hydrocarbons and heavy metals is becoming particularly acute for large oil-producing countries, like the Russian Federation. Both hydrocarbon and metal contaminants impact negatively the soil biota and human health, thus requiring efficient methods for their detoxification and elimination. Bioremediation of soil co-contaminated with hydrocarbon and metal pollutants is complicated by the fact that, although the two components must be treated differently, they mutually affect the overall removal efficiency. Heavy metals are reported to inhibit biodegradation of hydrocarbons by interfering with microbial enzymes directly involved in biodegradation or through the interaction with enzymes involved in general metabolism. Here we discuss recent progress and challenges in bioremediation of soils co-contaminated with hydrocarbons and heavy metals, focusing on selecting metal-resistant biodegrading strains and biosurfactant amendments.
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Phillips, A., A. Sabatini, P. J. M. Milligan, D. Boccolini, G. Broomfield e D. H. Molyneux. "The Anopheles maculipennis complex (Diptera: Culicidae): comparison of the cuticular hydrocarbon profiles determined in adults of five Palaearctic species". Bulletin of Entomological Research 80, n. 4 (dicembre 1990): 459–64. http://dx.doi.org/10.1017/s0007485300050720.
Testo completoAbstract (sommario):
AbstractA comparison was made between the cuticular hydrocarbons of five Palaearctic species of the Anopheles maculipennis Meigen complex; A. maculipennis sensu stricto, A. melanoon Hackett, A. messeae Falleroni, A. labranchiae Falleroni and A. atroparvus Van Thiel. Females of these species had their cuticular lipid removed and the hydrocarbons separated and quantified by gas chromatography. Discriminant analysis determined the degree of difference between the species. Wild caught adults of the complex had an average correct classification rate of 77.9%. A. atroparvus and A. labranchiae are homosequential and have no uniquely diagnostic isoenzymes, but expressed distinct hydrocarbon profiles enabling them to be separated in more than 86% of cases. Similarly, A. maculipennis sensu stricto and A. melanoon differ only by minor karyotype alterations, yet their hydrocarbon profiles could be separated with 83% correct classification. A dendrogram was drawn up, based on the hydrocarbons, using the Mahalanobis distances between species. A. maculipennis sensu stricto and A. melanoon were the two closest groups; A. messeae was next to join the cluster, followed by A. labranchiae and then A. atroparvus. These last two species were also very close to each other, but quite distant from A. maculipennis sensu stricto and A. melanoon. The species' relationships based on hydrocarbons thus reflect the tentative chromosomal phylogeny of the complex. In nature, hydrocarbon differences between species may be a device enabling the recognition of suitable mates. Studies showing that hydrocarbon dissimilarity is elevated between sympatric populations are also discussed in support of this theory.
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KALDYGOZOV, Ye К., V. M. KAPUSTIN, G. M. IZTLEUOV, B. A. ABDIKERIMOV e Ye S. TLEUBAEVA. "CATALYTIC REFORMING OF GASOLINE FRACTION OIL MIXTURES OF THE SOUTHERN REGION OF THE REPUBLIC OF KAZAKHSTAN". Neft i gaz 2, n. 116 (15 aprile 2020): 100–108. http://dx.doi.org/10.37878/2708-0080/2020.006.
Testo completoAbstract (sommario):
This article discusses the results of a study of the process of catalytic reforming of straight-run gasoline obtained from a mixture of oil from a field located in the southern region of Kazakhstan. The individual and group hydrocarbon composition of the initial hydrotreated gasoline and reformate was studied in order to establish the degree of conversion of hydrocarbons at different stages of catalytic reforming. The qualitative characteristics of the catalysis of gasoline reforming obtained at different stages of the process allows us to establish the chemistry and reaction mechanism and the laws of the chemical degree of conversion of individual hydrocarbon groups during all stages of catalytic reforming. As a result of studying the process of catalytic reforming of straight-run gasoline fractions НЕФТЕХИМИЯ НЕФТЬ И ГАЗ 2020. 2 (116) 103 О 2 (85–180°С), a chemistry and a reaction mechanism are established that are based on the following reactions: dehydrocyclization of paraffin hydrocarbons, dehydrogenation and dehydroisomerization of naphthenic, isomerization of naphthenic and paraffin hydrocarbons. Comparison of the physicochemical properties and group hydrocarbon composition of the hydrogenate and reforming products shows that the amount of n-paraffin and naphthenic hydrocarbons after catalytic reforming is reduced by 3–4times than in the originalgasoline, and the concentration of aromatic hydrocarbons is significantly increased due to the cyclane dehydrogenation reaction and dehydrocyclization of normal paraffins. Set forth in article information on changing the group and individual hydrocarbon composition of gasoline in various stages of the catalytic reforming process, can serve as a basis for optimal control of technological process of catalytic reforming and is a priority in the production of highquality grades of motor fuel and petrochemical development in the processing of local oil and gas Republic of Kazakhstan.
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Parinos, C., A. Gogou, I. Bouloubassi, R. Pedrosa-Pàmies, I. Hatzianestis, A. Sànchez-Vidal, G. Rousakis, D. Velaoras, G. Krokos e V. Lykousis. "Occurrence, sources and transport pathways of natural and anthropogenic hydrocarbons in deep-sea sediments of the Eastern Mediterranean Sea". Biogeosciences Discussions 9, n. 12 (13 dicembre 2012): 17999–8038. http://dx.doi.org/10.5194/bgd-9-17999-2012.
Testo completoAbstract (sommario):
Abstract. Surface sediments collected from deep basins (22 stations, 1018–4087 m depth) of the Eastern Mediterranean Sea (EMS) were analyzed for aliphatic, triterpenoid and polycyclic aromatic hydrocarbons (PAHs) as tracers of natural and anthropogenic inputs. Concentrations of total aliphatic hydrocarbons (TAHC), n-alkanes (NA) and the Unresolved Complex Mixture (UCM) of aliphatic hydrocarbons ranged from 1.34 to 49.2 µg g−1, 145 to 4810 ng g−1 and 0.73 to 36.7 µg g−1, respectively, while total PAHs (TPAH25) concentrations ranged from 11.6 to 223 ng g−1. Molecular profiles of aliphatic hydrocarbons and PAHs reflect the contribution of both natural (epicuticular plant waxes) and anthropogenic (degraded petroleum products, unburned fossil fuels and combustion of petroleum, grass, wood and coal) compounds in deep EMS sediments, with hydrocarbon mixtures displaying significant regional variability. Hydrocarbon concentrations correlated significantly with the Total Organic Carbon (TOC) content of sediments, indicating that organic carbon exerts an important control on their transport and fate in the study area, while strong sub-basin and mesoscale variability of water masses also impact their regional characteristics. Major findings of this study support that deep basins/canyons of the EMS could act as traps of both natural and anthropogenic hydrocarbons.
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Le, Nga Hoai, Huyen Dieu Thi Pham e Lan Tuyet Thi Nguyen. "Thermal maturity modelling for the source rocks in blocks 10 and 11.1, Nam Con Son basin". Journal of Mining and Earth Sciences 64, n. 1 (1 febbraio 2023): 1–9. http://dx.doi.org/10.46326/jmes.2023.64(1).01.
Testo completoAbstract (sommario):
Blocks 10 and 11.1 are located at the western boundary of the Nam Con Son basin, offshore southern Vietnam. Hydrocarbon shows have been encountered in many wells as the Gau Chua (GC), Ca Cho (CC), Gau Ngua (GN), Phi Ma (PM), Than Ma (TM), etc. In the CC and GN fields, the oil and gas were discovered in Miocene sandstone reservoirs and in fractured granite basement. The Cau and Dua formations are active source rocks in this area. Oil and gas discovered in wells were generated from coal and coaly claystone sediments which deposited under oxidation conditions to weak reducing in fluvio-delta to estuarine environments, in which land plants develop very abundantly. The 2D modeling results suggested that hydrocarbons discovered in the study area mainly derived from the local source rocks. The large quantity of hydrocarbons yields from source rocks in deeper part of southeastern kitchen migrated both vertically and laterally into the overlaying formations. Hydrocarbon strongly migrated lost through open fault. Prospects located near kitchen can trap hydrocarbons if they have a good seal. Block 10 and western block 11.1 face high risk of hydrocarbon charge due to the distance from the kitchen, weak top seal and fault seal. Of seal scenario, the composition of hydrocarbons accumulated in GC structure contains 87.5% volume of liquid and 12.5% volume of gas that derived from local Oligocene source rock. The composition of hydrocarbons in accumulation in CT (Ca Ty) structure of contains 99% volume of liquid and 92.5% volume of gas that derived from local Oligocene source rock.
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Habib, Syahir, Wan Lutfi Wan Johari, Mohd Yunus Shukor e Nur Adeela Yasid. "Screening of hydrocarbon-degrading bacterial isolates using the redox application of 2,6-DCPIP". Bioremediation Science and Technology Research 5, n. 2 (31 dicembre 2017): 13–16. http://dx.doi.org/10.54987/bstr.v5i2.358.
Testo completoAbstract (sommario):
Petroleum hydrocarbons remain as the major contaminants that could be found across the world. Remediation approach through the utilisation of microbes as the bioremediation means is widely recognised due to their outstanding values. As a result, scientific reports on the isolation and identification of new hydrocarbon-degrading strains were on the rise. Colourimetric-based assays are one of the fastest methods to identify the capability of hydrocarbon-degrading strains in both qualitative and quantitative assessment. In this study, the hydrocarbon-degrading potential of nine bacterial isolates was observed via 2,6-dichlorophenolindophenol (DCPIP) test. Two potent diesel-utilising isolates show a distinctive tendency to utilise aromatic (ADL15) and aliphatic (ADL36) hydrocarbons. Both isolates prove to be a good candidate for bioremediation of wide range of petroleum hydrocarbon components.
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Gailiūtė, I., S. Grigiškis, G. Žėkaitė e V. Čipinytė. "Selection of Microbes and Conditions that Induced Bio-Cracking of Branched Hydrocarbon Squalane". Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 1 (5 agosto 2015): 46. http://dx.doi.org/10.17770/etr2011vol1.893.
Testo completoAbstract (sommario):
Biological oil hydrocarbons degradation is a complicated process, influenced by hydrocarbons properties, microorganisms and environmental conditions. The aim of this work was to select microbial strain, capable of degrading heavy branched hydrocarbons for further application in environment remediation and bio-cracking. Also, it was necessary to select optimal conditions (temperature, pH, concentration and etc.) for selected microbial strain degrading heavy branched hydrocarbons. Since crude oil and its products are mixtures of various hydrocarbons, at the first step of selection the ability of the strains to degrade individual hydrocarbons was investigated. Squalane was used as a test substrate. 10 microbial cultures belonging to genus Arthrobacter and obtained from culture collection of JSC “Biocentras” were used for the investigations. Gas chromatography analysis revealed that Arthrobacter sp NJ5 strain had the highest effectiveness (67%) in degradation of heavy branched oil hydrocarbon (Squalane) to shorter chain intermediates. So, Arthrobacter sp NJ5 could be applied in bio-cracking. For the application in industry, more detailed analyses are needed.