Relevant bibliographies by topics / Polycyclic Aromatic Hydrocarbons / Dissertations / Theses
To see the other types of publications on this topic, follow the link: Polycyclic Aromatic Hydrocarbons.

Dissertations / Theses on the topic 'Polycyclic Aromatic Hydrocarbons'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 September 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Polycyclic Aromatic Hydrocarbons.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Tian, Zhenjiao. "Oxidation and Reduction Process for Polycyclic Aromatic Hydrocarbons and Nitrated Polycyclic Aromatic Hydrocarbons." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1228333650.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Crowley, Colin. "Fullerenes from polycyclic aromatic hydrocarbons." Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360582.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Safinowski, Michael. "Anaerobic biodegradation of polycyclic aromatic hydrocarbons." kostenfrei, 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=97648627X.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Robertson, Charles Ray. "Chemistry towards curved polycyclic aromatic hydrocarbons." abstract and full text PDF (free order & download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1438911.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Wanene, Wilson Kamau. "Toward curved polycyclic aromatic hydrocarbons (PAHs)." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1445914.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gleisner, Florian Hans. "Bacterial degradation of polycyclic aromatic hydrocarbons." Thesis, University of York, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247752.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Peters, Andrew John. "Polycyclic aromatic hydrocarbons in seasonal snowcover." Thesis, University of Southampton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315520.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Sritongkam, Pornpimol. "Electrochemical measurement of polycyclic aromatic hydrocarbons." Thesis, Cranfield University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274039.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Labib, Sarah. "Utility of Toxicogenomics Tools for the Toxicological Assessment of Polycyclic Aromatic Hydrocarbons and Complex Polycyclic Aromatic Hydrocarbon Mixtures." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35342.

Full text
Abstract:
Human exposures to polycyclic aromatic hydrocarbons (PAHs) occur as components of complex mixtures. Evaluations of health risks posed by complex mixtures containing PAHs rely on the toxicological knowledge of prioritized PAH mixture components, assuming that these PAHs share a common mode of action and that the sum of the contributions of these PAHs equals the toxic potency of the mixture (i.e., additivity). Traditional toxicity testing methods emphasizing apical endpoints have had limited success at evaluating the validity of these assumptions. Toxicogenomic tools that are able to rapidly generate toxicologically-relevant and mechanistic information have gained acceptance in the regulatory arena for individual chemicals; however, the applicability of these tools for chemical mixtures has been inadequately addressed. This thesis used toxicogenomic tools to (1) improve the understanding of mechanisms underlying the adverse, toxicological responses induced by individual PAHs and (2) evaluate the contention that transcriptional profiles and pathway information can be used to critically examine interactions between individual PAHs in PAH-containing mixtures, and the assumption of additivity. Microarrays were used to profile gene expression changes (transcriptomes) in forestomach, liver, and lung tissues (targets of PAH exposure) from mice orally exposed to three doses of eight individual PAHs, two defined PAH mixtures, and one complex PAH-containing mixture (coal tar). The results revealed that each PAH induced transcriptional changes that were significantly associated with several pathways implicated in carcinogenesis. However, despite a uniform ability to induce DNA damage (i.e., DNA adducts), mutations, and increases in enzyme activity, the pathways differ across PAHs and tissues. A novel strategy that employs single-PAH transcriptome data to models of additivity revealed that the assumption of additivity in PAH mixtures is valid at the pathway level; however, the independent action model of additivity yielded better estimates compared to concentration addition (used in human health risk assessment of PAH mixtures) or generalized concentration addition. Additionally, predicted and observed coal tar-induced transcriptional benchmark doses were comparable to those derived from previously published coal tar-induced murine lung tumour incidence data. Overall, this thesis demonstrates the utility of toxicogenomic data to expand the current understanding regarding the toxic potential of individual PAHs and PAH-containing complex mixtures.
APA, Harvard, Vancouver, ISO, and other styles
10

Ouellette, Mélanie. "Gas-phase Ion Chemistry of Hydroxy and Amino-substituted Interstellar Polycyclic Aromatic Hydrocarbons and Protonated Polycyclic Aromatic Hydrocarbons." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31349.

Full text
Abstract:
The gas-phase ion chemistry of hydroxyl- and amino-substituted polycyclic aromatic hydrocarbons (PAHs) and their protonated counterparts were studied using mass spectrometry. Ions were generated using an electron ionization (EI) source and the unimolecular chemistry of metastable ions was studied by performing mass-analysed ion kinetic energy spectrometry (MIKES) experiments with a magnetic sector tandem mass spectrometer. Collision-induced dissociation (CID) experiments were used in conjunction with MIKES experiments to determine ion structure. The ten molecules studied were: 1-naphthol, 2-naphthol, 1-naphthylamine, 2-naphthylamine, 1-aminoanthracene, 2-aminoanthracene, 1-phenanthrol, 9-phenanthrol, 1-hydroxypyrene and 1-aminopyrene. Since it is believed that larger PAHs, on the order of more than 50 carbon atoms, populate the interstellar medium, the goal of this study was to attempt to extrapolate the results from smaller systems to larger ones. The trends found include: hydroxy-substituted PAH radical cations lose carbon monoxide spontaneously and amino-substituted PAH radical cations lose HCN. Mechanisms for both processes are proposed, and it appears from the present results that this process should extrapolate to larger PAHs. Another trend found was that all the remaining fragment ions were always a closed ring. Protonated amino-substituted PAHs were generated by electrospray ionization using a quadruple time-of-flight mass spectrometer. By protonating 1-naphthol and 2-naphthol using methane in the high-pressure EI source, it was found that they lost exclusively H2O. As for 2-naphthylamine, 1-aminoanthracene and 2-aminoanthracene, it was found that 2-naphthylamine lost NH3 and a hydrogen atom, NH3being the dominant channel. However, as the ion size 3 increases, the hydrogen-loss channel became the dominant channel. This means that larger PAHs will likely lose exclusively a hydrogen atom to reform the parent radical cation.
APA, Harvard, Vancouver, ISO, and other styles
11

Pizzul, Leticia. "Degradation of polycyclic aromatic hydrocarbons by actinomycetes /." Uppsala : Department of Microbiology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200650.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
12

Candian, Alessandra. "Polycyclic aromatic hydrocarbons in the interstellar medium." Thesis, University of Nottingham, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604895.

Full text
Abstract:
The Unidentified Infrared (UIR) bands are a family of emission features seen in dusty objects, which are generally attributed to IR fluorescence of small (~ 50 C-atoms) polycyclic aromatic hydrocarbon (PAH) molecules. However, no specific PAH has so far been identified. The spatial distribution of 3.3 p,m PAH emission in the inner region of the Red Rectangle nebula is studied using an Integral Field spectroscopy technique. The presence of two components at 3.28 and 3.30 p,m with different spatial distributions, originally proposed by Song et al. (2003, 2007) is supported by these data. This implies the presence of two classes of 3.3 p,m band carrier with peak wavelength separation of ",0.02 p,m. From comparison of the 3.3 p,m observations with laboratory and theoretical spectra for a range of PAH molecules it is inferred that the 3.28 p,m and 3.30 p,m components arise from 'bay' and 'non-bay' hydrogen sites, respectively, on the periphery of neutral PAHs. The vibrational spectrum of a large number of PAH molecules are investigated with Density Functional Theory (DFT) calculations to find possible trends which may help in the identification of specific PAHs. It has been found that for acenes (single row), the position of the solo out-of-plane bending mode moves to shorter wavelength with increase number of carbon atoms. A similar behaviour holds also for 2-rows, 3-rows and large compact PAH molecules. Pericondensed and catacondensed PAHs with functional groups are investigated to assess their contribution to the unidentified 21 p,m feature, found in carbon-rich environments. They are unlikely to be responsible for the feature. The results of DFT calculations for large, solo-containing PAHs are then used to model Abstract 4 the asymmetric profile of the 11.2 p,m feature. The IR emission mechanism is taken into account, together with the effects of the DV radiation field in different sources; the temperature dependence of the solo out-of-plane bending mode and position are also considered, using state-of-the-art experimental data. It is found that the model reproduces very well the shape and the val1ations of the 11.2 p,m band in a few environments, supporting the idea that these variations are due to different mass distributions of PAHs, rather than anharmonicity. A similar model is then applied to acenes, which appear to contribute most of the intensity of the 11.0 p,m feature. High-resolution long-slit spectroscopic observations of the 11.2 p,m band in two PNe (NGC 7027 and BD+30° 3639) and in a PDR (The Orion Bar), in a search for fine stmcture have been carried out. While the presence of fine structure cannot ruled out, changes in the 11.2 p,m feature along the Orion Bar, from the molecular cloud to the ionised region, is seen suggesting possible evolution of the carriers of the feature. ..
APA, Harvard, Vancouver, ISO, and other styles
13

Smith, Michael John. "Bioremediation of polycyclic aromatic hydrocarbons in soil." Thesis, University of Kent, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242929.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Hoban, T. J. "Polycyclic aromatic hydrocarbons in the Severn Estuary." Thesis, University of South Wales, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305737.

Full text
APA, Harvard, Vancouver, ISO, and other styles
15

Petry, Thomas. "Human exposure to airborne polycyclic aromatic hydrocarbons (PAHs) /." [S.l.] : [s.n.], 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10726.

Full text
APA, Harvard, Vancouver, ISO, and other styles
16

Yi, Ling. "Micellar liquid chromatographic separation of polycyclic aromatic hydrocarbons /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1426117.

Full text
APA, Harvard, Vancouver, ISO, and other styles
17

Godschalk, Roger Wilhelmus Laurentius. "Biological markers for exposure to polycyclic aromatic hydrocarbons." Maastricht : Maastricht : Universiteit Maastricht ; University Library, Maastricht University [Host], 1999. http://arno.unimaas.nl/show.cgi?fid=6862.

Full text
APA, Harvard, Vancouver, ISO, and other styles
18

Al-Bashir, Bilal. "Biodegradation of polycyclic aromatic hydrocarbons in soilwater systems." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59963.

Full text
Abstract:
This study is concerned with the biodegradation of polycyclic aromatic hydrocarbons (PAHs), particularly the utilization of biological processes in the bioremediation of PAH-contaminated soils. In this regard, the effects of the contaminant bioavailability and the redox environment on the biodegradation process have been investigated.
First, the mineralization of naphthalene in soil/water systems under denitrifying conditions has been studied. Results showed that naphthalene mineralization is influenced by its availability to the microbial population, which in turn is a function of the compound initial concentration, the sorption/desorption characteristics of the soil/contaminant complex and the organic content of the soil.
Second, the biodegradation of four PAH compounds, acenaphthene, acenaphthylene, fluorene and anthracene, in a soil/water system under four redox environments has been studied. Both aerobic and denitrifying environments supported appreciable PAH biodegradation rates. The denitrifying environment was chosen for a further experiment to investigate the performance of a bioreactor system in treating PAH-contaminated soils. Results showed that by enlarging the scale of the reactor by approximately eight times and simultaneously reducing the mixing intensity of the soil slurry, the biodegradation rates of the PAH compounds remained virtually unchanged.
APA, Harvard, Vancouver, ISO, and other styles
19

Gachanja, Anthony Ngure. "Analysis of polycyclic aromatic hydrocarbons from biomass combustion." Thesis, University of Hull, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335081.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

Seitz, Fabian. "Ions colliding with Polycyclic Aromatic Hydrocarbons and Fullerenes." Doctoral thesis, Stockholms universitet, Fysikum, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-88427.

Full text
Abstract:
In this thesis a series of experiments on collisions between atomic projectile ions at keV energies and target vapors of either isolated molecules or van der Waals clusters is presented and analyzed. The atomic ions are produced in an Electron Cyclotron Resonance (ECR) ion source, accelerated and guided into the target volume. The charged target collision products are mass-to-charge analyzed in a time-of-flight spectrometer. The Polycyclic Aromatic Hyrdrocarbons (PAHs) Anthracene (C14H10), Coronene (C24H12), two C16H10 isomers, Pyrene and Fluoranthene, and the fullerene C60 are examined. For projectile ions in low charge states, small impact parameter collisions dominate, which leads to internal heating of the target. With isolated molecules as targets, this typically results in ionization and often also in fragmentation. For cluster targets energy and charge are rapidly distributed among the cluster building blocks. This is followed by cluster evaporation and very limited fragmentation of the individual molecules. C119+ and C118+ are observed as products. These are due to the formation of the reactive C58/59+ ions by direct knockout processes, which react with another C60 of the cluster to form dumb-bell shaped molecules. For projectile ions of high charge (Xe20+) larger impact parameters dominate, leading to little internal heating. For isolated molecule targets, intact molecular ions are the main collision products. Charged fragments stem mostly from multifragmentation following ionization to high charge states. For cluster targets, the collision products consist mainly of singly charged monomers. Fragmentation of the individual molecules is comparatively strong. This suggests a quick distribution of charges followed by a Coulomb explosion, which leads to internal heating. The results show that weakly bound clusters do not sustain the impact of keV-ions and that it is possible to form new molecular structures.

At the time of doctoral defense, the following papers were unpublished and had a status as follows: Paper 5: Submitted. Paper 6: Submitted.

APA, Harvard, Vancouver, ISO, and other styles
21

Laurie, Elizabeth Helen. "Source apportionment of urban atmospheric polycyclic aromatic hydrocarbons." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273558.

Full text
APA, Harvard, Vancouver, ISO, and other styles
22

Pushparajah, Daphnee S. "Interactions between polycyclic aromatic hydrocarbons in the liver." Thesis, University of Surrey, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436082.

Full text
APA, Harvard, Vancouver, ISO, and other styles
23

Jaskolka, John E. "Polycyclic Aromatic Hydrocarbons (PAH) Exposure in Firefighter Recruits." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250636298.

Full text
APA, Harvard, Vancouver, ISO, and other styles
24

Bryant, Yazmina Mercedes. "Interactions of polycyclic aromatic hydrocarbons with mineral surfaces." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/interactions-of-polycyclic-aromatic-hydrocarbons-with-mineral-surfaces(a81215d1-4510-48c8-ad75-a5b6433e80de).html.

Full text
Abstract:
The toxicity and ubiquitousness of PAHs within different terrestrial environments has been an increasing cause for concern amongst environmental scientists in the last decades, in particular regarding their transport within the soil. In an attempt to understand the role of pure inorganic phases in PAH-mobility; experiments exposing mineral soil components with low organic matter content to a PAH-representative were carried out. The systems consisted of four different mineral phases (quartz sand, hematite, iron coated quartz sand and montmorillonite) which were individually exposed to naphthalene in electrolyte solutions prepared at increasing ionic strengths (NaNO3: 0.001 M; 0.01 M; 0.1 M) and pH (4.0 and 5.5). All experiments were conducted over at 24 reaction intervals and at ambient temperature conditions.Mineral geosorbents are traditionally known to be poor PAH-scavengers; in particular when compared to organic, high surface area materials such as activated carbons. On this basis, a preliminary validation experiment (Proof of Concept Experiment) was conducted to test the sensitivity of the selected extraction method (SPME) under complete uptake (activated carbon) and very low uptake (quartz sand) conditions. By extracting and analysing the supernatant after 24 hr of exposure of both sorbents to naphthalene under identical conditions it was concluded that SPME was a feasible extraction technique, yielding good reproducibility (n=3, inter-day RSD%= 11.18% ) even at very low PAH concentrations (0.2 µg / L). The final concentration of naphthalene in the sample supernatant after 24 hours was determined by GC-FID. All samples were extracted using the Solid Phase Microextraction method developed during the Proof of Concept which allowed the rapid extraction of naphthalene in the headspace HS-SPME (extraction time = 3 minutes) using temperature control and ultrasonication as means of agitation. Each sample set included triplicates of blanks and samples as well as calibration standards (in duplicate where possible)Out of the four minerals, only quartz sand and hematite showed a slight tendency towards naphthalene removal from solution; a finding which correlated well with increasing ionic strength. The other two minerals did not show any such trend and the results were deemed inconclusive. In regards to the results for quartz and hematite; the detected uptake was found to be below the sensitivity of the current SPME extraction method according to the error analysis carried out by comparing the sample and blank means whilst accounting for error equal to 1σ. The overlapping of both means in the majority of the samples indicated that both averages were too close to be accurately resolved (due to very low naphthalene uptake). Modifications to the SPME method could improve the reproducibility and decrease the spread of the data; however, this measure would only guarantee higher statistical confidence (95 %) and not higher naphthalene uptake by these minerals. These observations lead to the conclusion that naphthalene was being salted out of solution rather than being removed by sorption; and under these experimental conditions it would not have been possible to detect any real PAH-mineral interaction. In view of this outcome, a different approach was attempted in order to detect surface reactions between the minerals and naphthalene. A series of preliminary (qualitative) surface analysis (AFM, XPS and ATR-FTIR) on pre-loaded mineral specimens were carried out in air at ambient temperature conditions. No naphthalene was positively identified on the surfaces of the studied sorbents. Factors such as molecular size, sorbents characteristics (i.e. roughness, surface charge) and loading conditions impeded the detection of the target molecules. Innovative sample preparation protocols as well as controlled analytical conditions would need to be implemented and evaluated before this kind of analytical tool can be used. The main outcome of this research work was the successful adaptation of SPME to the rapid extraction of naphthalene in electrolyte solutions at optimal and sub-optimal concentration levels; as the proof of concept preliminary experiment showed.
APA, Harvard, Vancouver, ISO, and other styles
25

Brown, James S. "The chemistry of nickel on the edge of polycyclic aromatic hydrocarbons /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1422914.

Full text
APA, Harvard, Vancouver, ISO, and other styles
26

Chen, Dongping. "Numerical investigation of polycyclic aromatic hydrocarbon clusters." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708341.

Full text
APA, Harvard, Vancouver, ISO, and other styles
27

Onchoke, Kefa Karimu. "Experimental and theoretical studies of nitrated polycyclic aromatic hydrocarbons." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1143220534.

Full text
APA, Harvard, Vancouver, ISO, and other styles
28

McConkey, Brendan. "Environmental photooxidation and mixture toxicity of polycyclic aromatic hydrocarbons." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0028/NQ51212.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
29

Mannion, Michael R. "Synthesis and chemistry of highly distorted polycyclic aromatic hydrocarbons." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0017/NQ52693.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
30

Parbin, Elbin Sehnza. "Synthesis of polycyclic aromatic hydrocarbons via benzannulated enediynyl alcohols." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5331.

Full text
Abstract:
Thesis (M.S.)--West Virginia University, 2007.
Title from document title page. Document formatted into pages; contains vii, 65 p. : ill. Includes abstract. Includes bibliographical references (p. 33-36).
APA, Harvard, Vancouver, ISO, and other styles
31

Hatjian, Berj Armen. "Risk assessment of occupational exposure to polycyclic aromatic hydrocarbons." Thesis, University of Newcastle Upon Tyne, 1995. http://hdl.handle.net/10443/372.

Full text
Abstract:
A novel strategy was used to assess the risk to health from exposure to polycyclic aromatic hydrocarbons (PAHs), an important class of chemical carcinogens, in workers in the paving and roofing industries using bitumen. The aim was to evaluate the risk of exposure to PAHs at three different stages: these were external exposure "external dose", internal exposure "internal dose" and biological effect "biologically effective dose". The approaches used for quantifying the risk at these stages were ambient monitoring, biological monitoring and biological effect monitoring, respectively. Ambient monitoring was carried out by personal air sampling and measurement of PAH-exposure. Excretion of thioethers (a non-selective biomarker) and 1-hydroxypyrene (a selective biomarker of exposure to pyrene) in urine were determined. Urinary d-glucaric acid, sister chromatid exchange in peripheral blood lymphocytes and micronuclei in exfoliated cells were use for biological effect monitoring. Seven groups of workers were studied. These were office workers, departmental staff and manual workers who were not occupationally exposed to PAHs and who were included as controls, and two groups of payers and roofers who were exposed to bitumen fumes during their work. The ambient monitoring program revealed that concentrations of PAHs in environmental air could be as high as those found in the payers' and roofers' occupational environments. The contribution of these background levels to the external dose of the pa yers and roofers was considerable. Payers and roofers were occupationally exposed to low levels of PAHs. The PAH profile in the personal air sample of the workers was different between the two industries. This was attributed to the presence of PAH-emission sources other than hot bitumen, such as vehicle exhaust. The concentration of naphthalene measured in air samples was a good indicator for identifying the existence of these sources. The quantitative evaluation of the carcinogenic risk inherent in the external dose using the 8 hour TWA concentration as a measuring stick did not seem to be effective due to the low "noise" levels of carcinogenic PAHs present. A semi-quantitative measure of the external exposure was suggested which appeared to be a better reflection of the carcinogenic risk. Urinary thioethers are not sensitive enough to be used as a nonselective biomarker of exposure to low levels of PAHs; however, urinary 1- hydroxypyrene was a good indicator of internal exposure to pyrene and therefore PAHs in bitumen fume. The relationship between 1-hydroxypyrene in urine and specific airborne PAH-exposure indices in the results of the payers, but not the roofers, suggested that the route of exposure in the latter is mainly dermal while that in the payers is more related to respiratory uptake. This observation, however, did not agree with the subjective occupational hygiene assessment where it was observed that the roofers were closer to the source of PAH-emissions due to the nature of their job and both groups did not use any respiratory or personal protective equipment. The measurement of urinary d-glucaric acid excretion suggested, but not strongly, that hepatic enzyme activity was induced in the occupationally PAH-exposed groups in comparison to controls and reflected the internal dose of pyrene or total PAHs. These observation; however, need further investigation. Micronuclei in exfoliated epithelial cells could not be measured in these populations as insufficient bladder epithelial cells were obtained for analysis. Sister chromatid exchange in peripheral blood lymphocytes of payers and roofers was significantly elevated in comparison to control and manual worker group. The group mean frequencies of SCE were significantly correlated with the external exposure to carcinogenic PAHs. This observation suggested that sister chromatid exchange is a very sensitive cytogenetic endpoint and is useful for evaluating the risk of exposure to low levels of carcinogenic PAHs. Risk assessment, such as the one conducted in this study, allows a quantitative estimation of risk associated with long-term exposure to moderate and low levels of airborne exposure to PAHs in bitumen fume. Knowledge of dose response relationship may allow a review of current Occupational Exposure Standards (OES) and Biological Exposure Limits, which are at present either unavailable or based on poor background scientific knowledge for most PAH compounds. In this study we have suggested an Occupational Exposure Limit for PAHs based on the sum of fourteen PAH-species.
APA, Harvard, Vancouver, ISO, and other styles
32

Ives, Sian E. "The biodegradation of polycyclic aromatic hydrocarbons (PAHs) in groundwater." Thesis, University of Huddersfield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368319.

Full text
APA, Harvard, Vancouver, ISO, and other styles
33

O'Kane, Gerard Anthony. "Metabolites and potential metabolites of polycyclic aromatic hydrocarbons (PAH's)." Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317097.

Full text
APA, Harvard, Vancouver, ISO, and other styles
34

Umachandran, Meera. "Interactions between polycyclic aromatic hydrocarbons in the rat lung." Thesis, University of Surrey, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435165.

Full text
APA, Harvard, Vancouver, ISO, and other styles
35

Totton, Timothy Stephen. "Modelling interactions of polycyclic aromatic hydrocarbons during soot formation." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610194.

Full text
APA, Harvard, Vancouver, ISO, and other styles
36

Sushko, O. A., О. М. Bilash, and M. M. Rozhitskii. "Nanophotonic method for polycyclic aromatic hydrocarbons detection in water." Thesis, ISE, 2012. http://openarchive.nure.ua/handle/document/8866.

Full text
Abstract:
Polycyclic aromatic hydrocarbons (PAHs) are the widespread environmental contaminants that can be found in atmosphere, water, soil, sediment and organisms. Among most dangerous PAHs is benzo[a]pyrene (BP). The effects of BP on health are: short-term when people are exposed to it at levels above the maximum contaminant level (MCL) (0.2 ppm) for relatively short periods of time leading to red blood cells damage, anemia ect; suppression of immune system and long-term, when human beings are exposured do BP influence at levels above the MCL namely effects on reproducibility and high probability of cancer illnesses. There are known methods for PAHs detection, such as chromatography, immuno-chemistry, biological and chemical ones. However, they have several disadvantages, including high cost, duration and complexity of the analysis procedure, the high detection limit and low selectivity. So at present a development of a new method of PAHs detection based on modern technologies and materials such as nanotechologies and nanomaterials. Belonging to above mentioned is nanophotonic method of PAHs assay. Nanophotonic method for PAHs detection in particular BP in water is a combination of electrochemical and electrochemiluminescence analysis with the application of nanomaterials and nanotechnologies. This method can be carried out using nanophotonic sensor based on nanomaterials such as semiconductor quantum dots (QDs).
APA, Harvard, Vancouver, ISO, and other styles
37

Sushko, O. A., О. М. Bilash, and M. M. Rozhitskii. "Nanophotonic method and sensor for polycyclic aromatic hydrocarbons detection." Thesis, ECL 2014, 2014. http://openarchive.nure.ua/handle/document/8963.

Full text
Abstract:
Anthropogenic pollution of environmental water is a huge problem for humanity today as it leads to an increase of incurable diseases. For example, the penetration into the organism of organic carcinogens such as polycyclic aromatic hydrocarbons (PAHs) can lead to the development of cancer tumors. Among PAHs the most dangerous is 3,4-benzopyrene (BP). There are a number of analytical methods for BP detection such as chromatographic, immuno-chemical, spectroscopic, luminescent and biological methods. But these methods beside their advantages have a number of significant shortcomings such as high detection limit (immuno-chemical and biological method), insufficient selectivity of PAHs detection, complexity and duration of sample preparation and analysis, high cost of device. Therefore development of new methods and tools for PAHs detecting using modern nanotechnology and nanomaterials remains urgent. So this work is devoted to the development of nanophotonic method and sensor device construction for the PAH in particular BP detection in water environment objects. Nanomaterials such as spherical quantum dots (QDs) are perspective object of nanophotonics can be used for development of optical sensors as sensor’s detector elements. They have a high luminescence quantum yield, possibility of optical and non-optical excitation, narrow luminescence spectrum and its wavelength dependence on the QDs diameter, high selectivity. This defined the perspective of their use instead of the well known organic luminophores.
APA, Harvard, Vancouver, ISO, and other styles
38

Hoffman, Joseph D. "Firefighters’ Exposure to Fine Particles and Polycyclic Aromatic Hydrocarbons." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1282061833.

Full text
APA, Harvard, Vancouver, ISO, and other styles
39

Sobus, Jon Russell Rappaport Stephen Morris. "Comparing urinary biomarkers of exposure to polycyclic aromatic hydrocarbons." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,1952.

Full text
Abstract:
Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2008.
Title from electronic title page (viewed Dec. 11, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the department of Environmental Sciences and Engineering." Discipline: Environmental Sciences and Engineering; Department/School: Public Health.
APA, Harvard, Vancouver, ISO, and other styles
40

Safa, Behnam. "Role of the aromatic hydrocarbon receptor in the suppression of cytochrome P450 2C11 by polycyclic aromatic hydrocarbons." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0022/MQ33953.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
41

Giessing, Anders Michael Bernth. "Biogeochemical Fate of Sediment-Associated PAH: Effect of Animal Processing." Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/GiessingAMB2002.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
42

Powell, Joyce R. 1968. "Spectrofluorometric and Solubility Studies of Polycyclic Aromatic Hydrocarbons in Hydrogen Bonded Binary Solvent Mixtures." Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc279188/.

Full text
Abstract:
The purpose of this dissertation is to investigate the behavior of polycyclic aromatic hydrocarbons (PAHs) in binary solvent systems and determine and/or develop predictive mathematical expressions for describing solutions in which hydrogen-bonding occurs.
APA, Harvard, Vancouver, ISO, and other styles
43

Schwab, Matthias Georg [Verfasser]. "From large polycyclic aromatic hydrocarbons to extended aromate-rich networks / Matthias Georg Schwab." Mainz : Universitätsbibliothek Mainz, 2011. http://d-nb.info/1018186565/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
44

Turcotte, Dominique. "Toxicity and metabolism of alkyl-polycyclic aromatic hydrocarbons in fish." Thesis, Kingston, Ont. : [s.n.], 2008. http://hdl.handle.net/1974/1382.

Full text
APA, Harvard, Vancouver, ISO, and other styles
45

Lu, Mingming. "Formation and growth of polycyclic aromatic hydrocarbons by cyclopentadienyl moieties in combustion." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/32824.

Full text
APA, Harvard, Vancouver, ISO, and other styles
46

Xu, Jinhui. "Analysis of nitrated polynuclear aromatic hydrocarbons in urban air." HKBU Institutional Repository, 1999. http://repository.hkbu.edu.hk/etd_ra/187.

Full text
APA, Harvard, Vancouver, ISO, and other styles
47

Xue, Xiang. "Mechanistic studies on the thermal cyclodehydrogenations of polycyclic aromatic hydrocarbons." Thesis, Boston College, 2008. http://hdl.handle.net/2345/22.

Full text
Abstract:
Thesis advisor: Lawrence T. Scott
Thermal cyclodehydrogenation is the key step in the total synthesis of fullerene C60 and represents an important family of carbon-carbon bond-forming reactions. My research focuses on understanding the mechanism of C-C bond formation in the high temperature cyclodehydrogenations of PAHs using appropriate test cases to form 5- or 6-membered rings. My goal was to understand more about molecular reactions under extreme conditions and thereby realize new synthetic pathways for new molecules. This dissertation describes the synthesis of several substrates and studies of their thermal cyclodehydrogenations. Chapter 1 presents the cyclodehydrogenations of [5]helicene and benzo[5]helicene to form 6-membered rings under flash vacuum pyrolysis (FVP) conditions. An observed rate difference established that an electrocyclic mechanism is favored in this case and disproved the radical cyclization and 1,2-hydrogen shift/carbene insertion mechanisms. Chapter 2 describes the cyclodehydrogenations of phenyl-substituted phenanthrenes to form 6-membered rings under FVP conditions. The radical mechanism is ruled out because of the rate difference. Chapter 3 shows the synthesis of 7-(9H-fluoren-9-ylidene)-7H-benzo[c]fluorene and its thermal cyclodehydrogenation to form 6-membered rings under FVP conditions. In chapter 4, the cyclodehydrogenations of phenyl-substituted anthracenes and phenanthrenes to form 5-membered rings under FVP conditions are presented. The unexpected dominance of phenyl loss suggests that radical mechanisms are occurring during the cyclodehydrogenations. Chapter 5 describes the cyclodehydrogenations of [4]helicene and benzo[4]helicene to form 5-membered rings under FVP conditions. The results point to a carbene cyclization mechanism, in competition with the radical mechanism
Thesis (PhD) — Boston College, 2008
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Chemistry
APA, Harvard, Vancouver, ISO, and other styles
48

Dorel, Bruscas Ruth. "New annulation strategies: from polycyclic aromatic hydrocarbons to natural products." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/401589.

Full text
Abstract:
Aquesta Tesi Doctoral cobreix tres camps de la química orgànica sintètica dedicats a la síntesi de nous materials basats en hidrocarburs aromàtics policíclics (HAPs), el desenvolupament de noves metodologies sintètiques catalitzades per complexos metàl·lics, i la síntesi de derivats de productes naturals. El desenvolupament de noves estratègies per a la síntesi de nous fragments de grafè amb estructures ben definides és un camp de gran interès donada la seva potencial implementació en dispositius d’electrònica molecular. Els fragments de grafè amb estructures circulars resulten particularment interessants degut a les seves extraordinàries propietats optoelectròniques i d’autoassemblatge. En aquest context es va desenvolupar la síntesi d’un nou fragment circular de grafè d’elevada simetria C54H20, tetrabenzocircumpirè, les propietats electròniques del qual van ser examinades mitjançant microscòpia d’efecte túnel (STM). Els acens estan constituïts per anells de benzè fusionats en línia i representen un atractiu tipus de HAPs degut a les seves propietats semiconductores. Tanmateix, la seva aplicació en dispositius electrònics està limitada per la seva baixa solubilitat i la seva inherent inestabilitat. Una possible solució per salvar aquestes limitacions és preparar derivats parcialment saturats més estables, els quals poden emprar-se com precursors dels sistemes conjugats. Així doncs, va establir-se un nou mètode per a la preparació d’acens parcialment saturats basat en una ciclació catalitzada per or(I) d’1,7-enins que deriven d’un precursor comú. Aquest mètode va resultar ser general i va permetre la preparació de diversos dihidrotetracens funcionalitzats, així com d’hidroacens amb fins a nou anells linealment fusionats. L’excepcional habilitat dels complexos d’or(I) per a construir estructures policícliques complexes va ser examinada també en el marc de la síntesi de productes naturals. L’alcoxiciclació d’1,6-enins catalitzada per or(I) va permetre un ràpid assemblatge de l’esquelet tetracíclic [3,5,5,7] de les echinopines, fet què va donar lloc a un mètode per a la preparació de derivats funcionalitzats d’aquests productes naturals.
Esta Tesis Doctoral cubre tres campos de la química orgánica sintética dedicados a la síntesis de nuevos materiales basados en hidrocarburos aromáticos policíclicos (HAPs), el desarrollo de nuevas metodologías sintéticas catalizadas por complejos metálicos, y la síntesis de derivados de productos naturales. El desarrollo de nuevas estrategias para la síntesis de nuevos fragmentos de grafeno con estructuras bien definidas es un campo de gran interés dada su potencial implementación en dispositivos de electrónica molecular. Los fragmentos de grafeno con estructuras circulares resultan particularmente interesantes debido a sus extraordinarias propiedades optoelectrónicas y de autoensamblaje. En este contexto se desarrolló la síntesis un nuevo fragmento circular de grafeno de elevada simetría C54H20, tetrabenzocircumpireno, cuyas propiedades electrónicas fueron examinadas mediante microscopía de efecto túnel (STM). Los acenos están constituidos por anillos de benceno fusionados en línea, y representan otra atractiva clase de HAPs debido a sus propiedades semiconductoras. Sin embargo, su aplicación en dispositivos electrónicos está limitada por su baja solubilidad y su inherente inestabilidad. Una posible solución para salvar estas limitaciones es preparar derivados parcialmente saturados más estables, los cuales pueden usarse como precursores de los sistemas conjugados. Así, se estableció un nuevo método para la preparación de acenos parcialmente saturados, el cual está basado en una ciclación catalizada por oro(I) de 1,7-eninos que derivan de un precursor común. Este método resultó ser general y permitió la preparación de diversos dihidrotetracenos funcionalizados, así como de hidroacenos con hasta nueve anillos linealmente fusionados.
This PhD covers three fields of synthetic organic chemistry devoted to the synthesis of new materials based on polycyclic aromatic hydrocarbons (PAHs), the development of new metal-catalyzed synthetic methodology, and the synthesis of natural product derivatives. The development of new strategies for the precise synthesis of structurally well-defined novel graphene cutouts is a field of great interest due to their potential implementation in molecular electronic devices. Particularly interesting PAHs are disc-shaped fragments of graphene because of their unique optoelectronic and self-assembly properties, which are predicted to be enhanced for expanded systems. In this context, an efficient synthesis of a new discotic highly symmetric C54H20 graphene fragment – tetrabenzocircumpyrene – was developed and the electronic properties of this new graphene fragment were examined by scanning tunneling microscopy (STM). Acenes consist of planar sets of linearly fused benzene rings and represent another appealing class of PAHs due to their semiconducting properties. Nonetheless, their applicability in electronic devices is limited by their poor solubility and their inherent instability. One approach to circumvent these limitations is the preparation of more stable partially saturated derivatives, which can be used as precursors of the conjugated systems. Thus, a selective method for the preparation of partially saturated acenes under mild reaction conditions was developed based on a gold(I)-catalyzed cyclization of suitable 1,7-enynes that were assembled from a common precursor. The method proved to be general and allowed the preparation of functionalized dihydrotetracenes, as well as larger hydroacenes with up to nine linearly fused rings. The outstanding ability of gold(I) complexes to construct complex polycyclic frameworks was also examined in the context of the synthesis of natural products. Thus, the gold(I)-catalyzed alkoxycyclization of cyclopropyl-tethered 1,6-enynes allowed the ready assembly of the [3,5,5,7] tetracyclic skeleton of Echinopines, which opened an entry for the preparation of functionalized derivatives of these natural products.
APA, Harvard, Vancouver, ISO, and other styles
49

Dimitriou-Christidis, Petros. "Modeling the biodegradability and physicochemical properties of polycyclic aromatic hydrocarbons." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4290.

Full text
Abstract:
The biodegradability and physicochemical properties of unsubstituted and methylated polycyclic aromatic hydrocarbons (PAHs) were investigated. The focus was on the development of models expressing the influence of molecular structure and properties on observed behavior. Linear free energy relationships (LFERs) were developed for the estimation of aqueous solubilities, octanol/water partition coefficients, and vapor pressures as functions of chromatographic retention time. LFERs were tested in the estimation of physicochemical properties for twenty methylated naphthalenes containing up to four methyl substituents. It was determined that LFERs can accurately estimate physicochemical properties for methylated naphthalenes. Twenty unsubstituted and methylated PAHs containing up to four aromatic rings were biodegraded individually by Sphingomonas paucimobilis strain EPA505, and Monod-type kinetic coefficients were estimated for each PAH using the integral method. Estimated extant kinetic parameters included the maximal specific biodegradation rate, the affinity coefficient, and the inhibition coefficient. The generic Andrews model adequately simulated kinetic data. The ability of PAHs to serve as sole energy and carbon sources was also evaluated. Quantitative structure-biodegradability relationships (QSBRs) were developed based on the estimates of the kinetic and growth parameters. A genetic algorithm was used for QSBR development. Statistical analysis and validation demonstrated the predictive value of the QSBRs. Spatial and topological molecular descriptors were essential in explaining biodegradability. Mechanistic interpretation of the kinetic data and the QSBRs provided evidence that simple or facilitated diffusion through the cell membranes is the rate-determining step in PAH biodegradation by strain EPA505. A kinetic experiment was conducted to investigate biodegradation of PAH mixtures by strain EPA505. The investigation focused on 2-methylphenanthrene, fluoranthene, and pyrene, and their mixtures. Integrated material balance equations describing different interaction types were fitted to the depletion data and evaluated on a statistical and probabilistic basis. Mixture degradation was most adequately described by a pure competitive interaction model with mutual substrate exclusivity, a fully predictive model utilizing parameters estimated in the sole-PAH experiments only. The models developed in this research provide insight into how molecular structure and properties influence physicochemical properties and biodegradability of PAHs. The models have considerable predictive value and could reduce the need for laboratory testing.
APA, Harvard, Vancouver, ISO, and other styles
50

Pillai, Ilona G. "Identification and carcinogenicity of polycyclic aromatic hydrocarbons in transformer oil." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/4239.

Full text
Abstract:
Insulating oils are rich in polycyclic aromatic hydrocarbons (PAHs) which act as inhibitors of oil breakdown, but are believed to be the main source of oil mutagenicity when converted to their epoxide form by mammalian enzymes. The current industry- recognised measurement of oil risk, the IP 346 method, measures total aromatic content and therefore cannot be directly related to PAH risk. This thesis describes efforts made to establish the contribution of PAH species alone to total oil mutagenicity.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the bibliographies on the topic 'Polycyclic Aromatic Hydrocarbons' for other source types:
Journal articles Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography