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Relevant bibliographies by topics / Gas chromatography-atomic fluorescence spectrometry

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Academic literature on the topic 'Gas chromatography-atomic fluorescence spectrometry'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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Journal articles on the topic "Gas chromatography-atomic fluorescence spectrometry"

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Ebdon, Les, Mike E. Foulkes, Sophie Le Roux, and Riansares Muñoz-Olivas. "Cold vapour atomic fluorescence spectrometry and gas chromatography-pyrolysis-atomic fluorescence spectrometry for routine determination of total and organometallic mercury in food samples." Analyst 127, no. 8 (2002): 1108–14. http://dx.doi.org/10.1039/b202927h.

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Creaser, Colin S., and Andrew Stafford. "Combined capillary column gas chromatography-molecular fluorescence spectrometry." Analyst 112, no. 4 (1987): 423. http://dx.doi.org/10.1039/an9871200423.

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Gómez-Ariza, J. L., F. Lorenzo, T. Garcı́a-Barrera, and D. Sánchez-Rodas. "Analytical approach for routine methylmercury determination in seafood using gas chromatography-atomic fluorescence spectrometry." Analytica Chimica Acta 511, no. 1 (May 2004): 165–73. http://dx.doi.org/10.1016/j.aca.2004.01.051.

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Gao, Y., S. De Galan, A. De Brauwere, W. Baeyens, and M. Leermakers. "Mercury speciation in hair by headspace injection–gas chromatography–atomic fluorescence spectrometry (methylmercury) and combustion-atomic absorption spectrometry (total Hg)." Talanta 82, no. 5 (October 15, 2010): 1919–23. http://dx.doi.org/10.1016/j.talanta.2010.08.012.

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Bowles, Karl C., and Simon C. Apte. "Determination of Methylmercury in Natural Water Samples by Steam Distillation and Gas Chromatography−Atomic Fluorescence Spectrometry." Analytical Chemistry 70, no. 2 (January 1998): 395–99. http://dx.doi.org/10.1021/ac970826s.

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GU, Yu-Xiao, Mei MENG, Jun-Juan SHAO, Jian-Bo SHI, Bin HE, and Gui-Bin JIANG. "Determination of Methylmercury in Soil Samples with Online Purge and Trap Gas Chromatography-Atomic Fluorescence Spectrometry." CHINESE JOURNAL OF ANALYTICAL CHEMISTRY (CHINESE VERSION) 41, no. 11 (2013): 1754. http://dx.doi.org/10.3724/sp.j.1096.2013.30546.

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Shi, Jian-bo, and Gui-bin Jiang. "Application of Gas Chromatography–Atomic Fluorescence Spectrometry Hyphenated System for Speciation of Butyltin Compounds in Water Samples." Spectroscopy Letters 44, no. 6 (September 2011): 393–98. http://dx.doi.org/10.1080/00387010.2011.559511.

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Lihua, Zhang. "Detection of Urethane in Non-alcoholic Fermented Food." E3S Web of Conferences 189 (2020): 02003. http://dx.doi.org/10.1051/e3sconf/202018902003.

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Among fermented foods, urethane often appears, which is a “2A” grade carcinogen. There are many types of fermented foods in my country, and the detection methods are not uniform enough, and no specific urethane detection standards have been formed. This article summarizes the specific experiments and results analysis based on previous work experience. At the same time, this article discusses six aspects from thin layer analysis, gas chromatography, gas chromatography-mass spectrometry, two-dimensional live multidimensional gas chromatography with stable isotope labeling mass spectrometry, high performance liquid chromatography-fluorescence, and nuclear magnetic resonance detection. The detection method of urethane in non-alcoholic fermented foods is introduced.

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Shi, Jian-Bo, Li-Na Liang, and Gui-Bin Jiang. "Simultaneous Determination of Methylmercury and Ethylmercury in Rice by Capillary Gas Chromatography Coupled On-line with Atomic Fluorescence Spectrometry." Journal of AOAC INTERNATIONAL 88, no. 2 (March 1, 2005): 665–69. http://dx.doi.org/10.1093/jaoac/88.2.665.

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Abstract A comprehensive method for simultaneous determination of methylmercury (MeHg) and ethylmercury (EtHg) in rice by capillary gas chromatography (GC) coupled on-line with atomic fluorescence spectrometry was developed. The experimental conditions, including the pyrolyzer temperature and flow rates of the make-up gas and sheath gas, were optimized in detail. The absolute detection limits (3σ) were 0.005 ng as Hg for both MeHg and EtHg. The relative standard deviation values (n = 5) for 10 ng Hg/mL of MeHg and EtHg were 2.5 and 1.3%, respectively. The method was evaluated by analyzing 2 certified reference materials (DORM-2 and GBW08508), and the determined values of MeHg and total mercury concentrations were in good agreement with the certified values. In addition, the recoveries of MeHg and EtHg spiked into a rice sample collected from Jiangsu province in China were 86 and 77%, respectively. The proposed method was applied to analysis of MeHg and EtHg in 25 rice samples cultivated in 15 provinces of China. In all samples, MeHg was detectable and no EtHg was found. The MeHg contents in rice samples ranged from 1.9 to 10.5 ng/g, accounting for 7–44% of the total mercury measured.

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Cai, Yong, Rudolf Jaffé, Azaam Alli, and Ronald D. Jones. "Determination of organomercury compounds in aqueous samples by capillary gas chromatography-atomic fluorescence spectrometry following solid-phase extraction." Analytica Chimica Acta 334, no. 3 (November 1996): 251–59. http://dx.doi.org/10.1016/s0003-2670(96)00309-1.

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Dissertations / Theses on the topic "Gas chromatography-atomic fluorescence spectrometry"

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Salman, M. S. "Atomiser, source, inductively coupled plasmas in atomic fluorescence spectrometry (A.S.I.A.) : a study of chemical and ionisation interference effects." Thesis, Loughborough University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235873.

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Bowles, Karl C., and n/a. "The cycling of mercury in Australasian aquatic systems." University of Canberra. School of Resource, Environmental & Heritage Sciences, 1998. http://erl.canberra.edu.au./public/adt-AUC20060609.144839.

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Methods were developed for the determination of methylmercury in natural waters and sediments based on steam distillation and aqueous phase ethylation followed by gas chromatography-atomic fluorescence spectrometry. The methods were shown to be free from measurable artefactual methylation of inorganic mercury and offered improved sample throughput over existing methods. Improvements were made to existing methods for the determination of total mercury in biota, sediments and natural waters and dissolved mercury species in natural waters. These methods were applied to the study of mercury cycling in two remote field sites. The cycling of mercury species was studied in Lake Murray in Western Province, Papua New Guinea, which has been historically noted as a region of high mercury concentrations in fish. Concentrations of methylmercury and total mercury in the water column were found to be variable and consistent with non-contaminated lake systems. Concentrations of methylmercury and total mercury in the sediments were also found to be low, except for in the south of the lake, which was influenced by an intermittent supply of water and sediments with elevated mercury concentrations from the Strickland River. Methylmercury concentrations in the sediments were generally higher in the backwater areas due to littoral processes. The low concentrations of methylmercury in the sediments and waters were inconsistent with other systems previously studied in the northern hemisphere, showing a link between high mercury concentrations in fish and high concentrations of methylmercury in waters or sediments. Therefore, the biota of Lake Murray were studied in order to account for the differences between this and other systems. A study was conducted of the stable isotope ratios of carbon and nitrogen in biota from Lake Murray to elucidate key food-web interactions. This study revealed that the dominant carbon source for fish in the lake is plankton, although algae and macrophytes may also be involved in the food-web. The methylmercury bioaccumulation factors between trophic levels were similar to those measured in temperate systems of the northern hemisphere. The high concentrations of methylmercury, observed in piscivorous fish, were shown to be a consequence of the complex food-web and the number of trophic levels in the food-chains. The cycling of mercury species was studied in Lake Gordon and Lake Pedder in southwest Tasmania, which has recently been identified as being in a region of high mercury concentrations in trout and eels. The concentrations of total mercury were found to be reasonably uniform in the waters of both lakes, spatially and temporally. The concentrations of methylmercury in the waters were seasonally variable, and were consistently lower in Lake Pedder than in Lake Gordon. Dilution of methylmercury concentrations by precipitation direct to the lake surface, probably accounts for the most of the difference in methylmercury concentrations between the lakes. Owing to the long residence time of water in Lake Gordon, this reservoir mixes inputs of water with varying methylmercury concentrations. Concentrations of total mercury and methylmercury in submerged soils were low and depth profiles of mercury species in the water column did not show evidence of a gradient of mercury concentrations due to releases from the sediments. The concentrations of methylmercury observed in the water column are consistent with the concentrations observed in the fish. A budget of the mercury inputs and outputs to Lake Gordon showed that in-lake processes and sources in the catchment areas both contributed significantly to the concentrations of methylmercury in the lake. The methylation of mercury in Lake Gordon appeared to mainly occur in the surface waters (< 10 m) and was not consistent with processes leading to the methylation of mercury at the oxic/anoxic boundary observed in seepage lakes in Wisconsin. The concentrations of total mercury and methylmercury in bogs in the catchment areas of Lakes Gordon and Pedder, were high and governed by the concentration of organic matter in the sediments. The processes involved in the supply of mercury species from the Lake Gordon and Lake Pedder catchments appear to be similar to those in drainage lakes in the temperate and boreal regions of the northern hemisphere. The formation of the Lake Gordon and Lake Pedder reservoirs appears to have had little impact on the mean annual concentrations of methylmercury released to the downstream environment.

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Armstrong, Helen Elisabeth Louise. "Speciation of mercury by chromatography coupled with atomic spectrometry." Thesis, University of Plymouth, 2000. http://hdl.handle.net/10026.1/1868.

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A commercial GC-AFS instrument has been developed and optimised for the speciation of organomercury. This instrument couples a GC oven to a modified atomic fluorescence detector via a ceramic pyrolyser. Organomercury compounds in dichloromethane solvent were directly injected through a Programmable Temperature Vaporiser Injector onto a DBl Megabore column. Once separated, the compounds eluted from the column and were atomised in the pyrolyser then detected by AFS. The direct injection technique, ceramic pyrolysis design and argon purged detector have improved previous instrument designs by enhancing and maintaining sensitivity. The instrumental limit of detection was determined to be 0.25 pg Hg absolute. Methods were developed for the extraction of methylmercury from a variety of marine samples. The techniques were validated using mussel homogenate and dogfish liver (IAEA 142, SRM 8044 and DOLT-2) certified reference materials. An interlaboratory comparision exercise was participated in and a method was developed for the detemination of methylmercury in Fucus sea plant (IAEA 140). A concentration of 0.63 ± 0.006 ng g-1 was reported. The material is now certified at 0.626 +0.139 ng g-1. Of all the participating laboratories, this was the closest result to the certified value. The instrument and methods were also applied to soil and sediment samples. Once again validation was performed with a CRM sediment, IAEA 356. Although this material has been reported to give positive artifact formation when using a steam distillation sample preparation procedure, good agreement and no artifects were observed upon analysis. A further contaminated land, an uncontaminated soil and sediment sample were also studied. For all the samples studied by GC-AFS total mercury measurements were also made following an appropriate digestion procedure and CV-AFS. A gas chromatograph was also coupled with ICP-MS and HPLC was coupled to CV-AFS as comparative techniques. Both approaches were optimised and validated with CRM's. The GC-ICP-MS had the advantage of providing additional element information and confirmed the presence of methylmercury bromide in the final mussel homogenate extract. The HPLC approach found to be much less sensitive than the GC techniques and also suffered from vapour generation interferences. The PTV injector was considered for large volume injection and thermal desorption techniques. Injector breakdown problems were overcome by optimising the conditions and solid phase adsorbent for cold splitless injection. A recovery of 70% was achieved for a 50 ul large volume injection of methylmercury chloride in DCM. This technique indicated the possibility that LVI may in the future offer increased method sensitivity.

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Alli, Azaam. "Analysis of organomercurials in environmental and biological samples by capillary column gas chromatography with atomic fluorescence detection." FIU Digital Commons, 1994. http://digitalcommons.fiu.edu/etd/1069.

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The general method for determining organomercurials in environmental and biological samples is gas chromatography with electron capture detection (GC-ECD). However, tedious sample work up protocols and poor chromatographic response show the need for the development of new methods. Here, Atomic Fluorescence-based methods are described, free from these deficiencies. The organomercurials in soil, sediment and tissue samples are first released from the matrices with acidic KBr and cupric ions and extracted into dichloromethane. The initial extracts are subjected to thiosulfate clean up and the organomercury species are isolated as their chloride derivatives by cupric chloride and subsequent extraction into a small volume of dichloromethane. In water samples the organomercurials are pre-concentrated using a sulfhydryl cotton fiber adsorbent, followed by elution with acidic KBr and CuSO 4 and extraction into dichloromethane. Analysis of the organomercurials is accomplished by capillary column chromatography with atomic fluorescence detection.

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Rouveirolles, Pierre. "Etude de la cinetique en phase gazeuse de reactions du radical nh2 a haute temperature." Orléans, 1987. http://www.theses.fr/1987ORLE2019.

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Reactions du radical nh::(2) avec des alcanes, h::(2) et h::(2)o. Les reactions etudiees jouent un role important dans la modelisation des processus de combustion ou de post-combustion des hydrocarbure et dans la connaissance du mecanisme reactionnel gouvernant le traitement par injection d'ammoniac des oxydes d'azote contenus dans les gaz d'echappement des machines thermiques

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Laggoun-Defarge, Fatima. "Etude de la diagenese organique des series paleozoiques du bassin de sbaa (algerie) : approche geochimique et petrologique." Orléans, 1987. http://www.theses.fr/1987ORLE2031.

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L'etude porte sur la genese des reserves d'huile trouvees dans le bassin de sbaa, sahara algerien, notamment dans la formation du tournaisien des "gres de sbaa". Les echantillons sont analyses du point de vue petrologique par microspectrofluorimetrie et du point de vue geochimique par pyrolyse et chromatographie en phase gazeuse. La roche mere des hydrocarbures est le silurien; leur generation, suivie de peu par la migration date probablement de la fin du primaire. L'orogenie hercynienne est responsable de la mise en place des pieges structuraux. D'autre part, un concentre d'algues tasmanacees provenant du silurien a ete soumis a une simulationd e generation d'hydrocarbure (pyrolyse en milieu confine): on montre ainsi qu'elles participent a la formation du petrole du bassin de sbaa

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Nguyen, Van Dong. "Speciation analysis of butyl- and phenyltin compounds in environmental samples by GC separation and atomic spectrometric detection." Doctoral thesis, Umeå : Department of Chemistry, Umeå University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-892.

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Harkabusová, Veronika. "Sledování forem arsenu v potravinách." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216226.

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The diploma thesis is dealing with monitoring of arsenic in foodstuffs. The aim of this thesis is the determination of arsenic in samples of fish and rice and the study of forms, in which arsenic occurs, using speciation analysis. Arsenic is known as a toxic element, but its measure of toxicity depends on the chemical form it occurs in. Arsenic is present in the environment naturally or it gets in the environment by human activities. Complete characterization of arsenic compounds is necessary to understand intake, accumulation, transport, detoxification and activation of this element in the natural environment and living systems. The field of arsenic speciation analysis has grown rapidly in recent years, because determination of the total element content is not sufficient in the case of arsenic. Speciation method was done using separation by high performance liquid chromatography and detection by atomic fluorescence spectrometry with hydride generation. Extractable arsenic was present in the form of nontoxic arsenobetaine in all analysed samples of fish. In samples of rice there was confirmed the presence of toxic inorganic species of arsenic, esspecially As (III), but their concentration was at low level.

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Suarez, Carlos Alfredo. "Estabilidade de espécies de arsênio em amostras biológicas acoplando cromatografia líquida ou eletroforese capilar com detectores atômicos." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/64/64135/tde-16092010-151341/.

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Neste projeto foram abordados procedimentos analíticos para extração, separação e identificação de espécies de arsênio encontradas normalmente em quantidades de traços e ultra-traços em amostras biológicas e ambientais. Entre as amostras alvo deste estudo, teve-se alimentos de origem marinha como por exemplo camarão. Foi avaliada a estabilidade das espécies de arsênio nas soluções geradas pelos processos de extração. Para separação das espécies inorgânicas (arsenito e arsenato), metiladas (ácidos mono e dimetil arsênio) e orgânicas (arsenobetaina) empregaram-se as técnicas eletroforese capilar (CE) e cromatografia líquida (LC). Os sistemas de separação para a determinação das espécies de arsênio foram acoplados com os espectrômetros massas (ICP-MS), e de fluorescência atômica (AFS). Os sistemas acoplados apresentaram resolução e sensibilidade na determinação das espécies de arsênio nas amostras estudadas neste trabalho. A extração com água de espécies de As utilizando-se banho de ultra-som apresentou eficiência acima de 78%. A estabilidade das espécies nas soluções padrão e nos extratos das amostras foi mantida por um período de até uma semana quando armazenadas em geladeira (+4°C). Visando uma política de química limpa, foi desenvolvida uma metodologia para evitar desperdiço preparando micro-volumes de amostras e soluções padrão, para especiação de arsênio por eletroforese capilar. Para tal se empregou um injetor seqüencial, também foi desenvolvido um dispositivo de injeção hidrodinâmica para eletroforese capilar. Além disto, as soluções residuais geradas durante a pesquisa analítica foram tratadas para a recuperação de arsênio e boro. A extração no ponto nuvem foi empregada para recuperar As entanto que a precipitação por mineralização hidrotérmica foi aplicada para a recuperação de B . A aplicação deste procedimento resultou na extração de 80% de arsênio e 75% de boro. Isto, permitiu converter grandes volumes de resíduos líquidos perigosos em um pequeno volume de resíduos sólidos
Analytical procedures for extraction, separation and identification of arsenic species at ultra-trace levels in biological and environmental samples were investigated. Stability studies of arsenic species in sample extracts and standard solutions were carried out. Separation of arsenite, arsenate, monomethylarsonic and dimethylarsinic acids and also arsenobetaine were carried out by capillary electrophoresis or liquid chromatography. Determination of the separated arsenic species was accomplished by coupling the separation techniques to inductively coupled plasma mass spectrometry (ICP-MS) or atomic fluorescence spectrometry (AFS). Satisfactory resolution and sensibility were achieved by the coupled systems described. Extraction efficiency better than78% were achieved with water in an ultrasonic bath at the laboratory temperature (23-27°C). Whereas, stability of species in solutions stored in refrigerator at +4°C was efficient for aperiod up to one week. Micro-volumes of standards and sample solutions mixed in a sequential injector were prepared for arsenic speciation by capillary electrophoresis, aiming green chemistry. A time controlled micro-volume injector device for hydrodinamic injections was also developed. Finally, waste solutions from arsenic speciation analysis in a system with hydride generation were treated for arsenic and boron removal. Cloud point extraction for recovery of arsenic and hydrothermal mineralization of boron by calcium hydroxide were employed. Satisfactory removal of 80% of arsenic and 75% of boron from waste solution was achieved. These procedures allowed to reduce volumes of hazardous waste solutions

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Motlová, Tereza. "Speciační analýza selenu v kvasinkách kultivovaných v médiu s přídavkem selenu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2010. http://www.nusl.cz/ntk/nusl-216569.

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The aim of the theses was determination of selenium species in yeast Saccharomyces cerevisiae cultivated in medium with added inorganic form of selenium (Sodium Selenite). Concentrations of Sodium Selenite in cultivation medium were 0,1; 1; 10 and 100 mg.l-1. Cultivation was undertaken in fermenting tub for period of 72 hours. Cultivated yeasts were extracted by use of enzymes and subsequently the species of selenium in particular parts of yeasts were determined. In order to determine selenium species, the method of high-performance liquid chromatography in combination with atomic fluorescent spectrometer and technique of hydride generation was used. Having analysed different fractions of the yeasts Saccharomyces cerevisiae it was ascertained that during cultivation the sorption of selenium occurred in form of Se4+ in cell membranes while in cytoplasm no inorganic forms of selenium were found. Furthermore, it was stated that yeasts Saccharomyces cerevisiae are able to metabolically change inorganic forms of selenium to organic forms (selenomethionine), while these forms are present in cytoplasm and they are likely to be bound to proteinic structures of cell membranes. An increase of concentration of Se4+ in cell membranes could be observed as a result of increasing concentration of Sodium Selenite in cultivation medium. In proteinic structures the concentration of organic selenium forms increased only to concentration 10 mg.l-1 of Sodium Selenite in cultivation medium.

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Book chapters on the topic "Gas chromatography-atomic fluorescence spectrometry"

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Sullivan, James J., and Bruce D. Quimby. "Characterization of Interferences Affecting Selectivity in Gas Chromatography—Atomic Emission Spectrometry." In ACS Symposium Series, 62–89. Washington, DC: American Chemical Society, 1992. http://dx.doi.org/10.1021/bk-1992-0479.ch004.

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Matuszewska, Aniela, and Maria Czaja. "The Use of Synchronous Fluorescence Technique in Environmental Investigations of Polycyclic Aromatic Hydrocarbons in Airborne Particulate Matter from an Industrial Region in Poland." In Environmental Emissions. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.92402.

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The applicability of the fluorescence techniques to identify the polycyclic aromatic hydrocarbons (PAHs) in environmental samples is presented. The technique of synchronous fluorescence enabled the identification of the PAHs series containing 2–6 condensed rings in urban airborne particulate matter from Upper Silesia industrial region in Poland. The results obtained by synchronous and conventional fluorescence measurements have been confirmed by those from gas chromatography-mass spectrometry. As the air sample was taken in summer season, the main source of pollution by PAHs component seems to be transport – the exhaust gases from motor vehicles.

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Bianchi, Thomas S., and Elizabeth A. Canuel. "Analytical Chemical Methods and Instrumentation." In Chemical Biomarkers in Aquatic Ecosystems. Princeton University Press, 2011. http://dx.doi.org/10.23943/princeton/9780691134147.003.0004.

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This chapter provides a background on the important role technology has played in the study of chemical biomarkers, and the many advances in the field that have resulted from the development of new analytical tools. It introduces some of the classic analytical tools used in organic geochemistry, including gas chromatography-mass spectrometry (GC-MS), pyrolysis GC-MS, direct temperature-resolved MS, compound-specific isotope analysis, high-performance liquid chromatography, and nuclear magnetic resonance (NMR) spectroscopy. Additionally, characterization of dissolved organic matter (DOM) and chromophoric DOM by fluorescence, use of pulsed amperometric detector (PAD) detectors in the analysis of sugars, and capillary electrophoresis are introduced. Recent advances in the following areas are also covered: (1) analysis of polar organic compounds utilizing liquid chromatography mass spectrometry, (2) multidimensional NMR, and (3) Fourier transform ion cyclotron resonance MS.

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"Atomic Masses and Isotope Abundances." In Gas Chromatography and Mass Spectrometry, 359. Elsevier, 1996. http://dx.doi.org/10.1016/b978-012483385-2/50044-0.

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"Atomic Masses and Isotope Abundances and Other Information for the Determination of an Elemental Composition from Isotope Peak Intensity Ratios." In Gas Chromatography and Mass Spectrometry: A Practical Guide, 431–32. Elsevier, 2011. http://dx.doi.org/10.1016/b978-0-12-373628-4.00039-3.

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Morrison, L., B. Chen, and W. Corns. "Arsenic speciation in seaweeds using liquid chromatography hydride generation atomic fluorescence spectrometry (HPLC-HG-AFS)." In Arsenic in the Environment - Proceedings, 185–86. CRC Press, 2014. http://dx.doi.org/10.1201/b16767-69.

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"Arsenic speciation in rice using liquid chromatography and flow injection atomic fluorescence spectrometry (FI-HPLC-HG-AFS)." In Understanding the Geological and Medical Interface of Arsenic - As 2012, 434–35. CRC Press, 2012. http://dx.doi.org/10.1201/b12522-156.

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"The use of ion chromatography hydride generation atomic fluorescence spectrometry (HPLC-HG-AFS) for arsenic speciation in apple juice." In Understanding the Geological and Medical Interface of Arsenic - As 2012, 457–58. CRC Press, 2012. http://dx.doi.org/10.1201/b12522-166.

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Zhang, Nina, Liping Liu, Wujie Ren, and Shaozhan Chen. "Determination of selenium species in Se-enriched food supplement tablets by anion-exchange liquid chromatography-hydride generation-atomic fluorescence spectrometry." In Global Advances in Selenium Research from Theory to Application, 39–40. CRC Press, 2015. http://dx.doi.org/10.1201/b19240-21.

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Conference papers on the topic "Gas chromatography-atomic fluorescence spectrometry"

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de Vries, J. X., R. Raedsch, A. Stiehl, U. Voelker, I. Walter-Sack, and E. Weber. "EVIDENCE FOR BIIIARY EXCRETION OF PHENPROCOUMON AND ITS METABOLITES IN HUMANS; IDENTIFICATION BY HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY AND GAS CHROMATOGRAPHY-MASS SPECTROMETRY." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643272.

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Recently it has been shown that in man the oral couma-rin anticoagulant phenprocoumon is eliminated up to 60-70 % in urine and 30-40 % in faeces; in urine phenprocoumon (PH) and its metabolites 7-hydroxy-(7-OH),6-hydroxy-(6-OH) and 4'-hydroxy-(4'-OH) phenprocoumon are present mainly as conjugates. No data so far were available on the biliary excretion of these compounds.We examined bile obtained from four in-patients during PH treatment; bile samples were aspirated in the duodenum at the papilla during routine diagnostic endoscopy and immediately deep frozen before analysis. Samples were extracted both untreated as well as after hydrolysis with 6-glucuronidase/aryl sulfatase and separated by reversed phase gradient elution high performance liquid chromatography (HPLC) with fluorescence detection; for confirmation, the same extracts were methylated and analysed by gas chromatography-mass spectrometry (CG-MS) (J.X.de Vries et al J Chromatogr., 338 (1985) 325). PH, 7-OH, 6-OH and 4'-OH were identified by comparison with synthetic authentic samples'''''''

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Law, B., S. Stone, D. Frazer, and P. Siegel. "295. Chemical Characterization of Laboratory Simulated Road Paving-Like Asphalt Fume Generated by Gas Chromatography-Mass Spectrometry and High Performance Liquid Chromatography-Fluorescence Techniques." In AIHce 2005. AIHA, 2005. http://dx.doi.org/10.3320/1.2758760.

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Chen, Hsieh, Sehoon Chang, Gawain Thomas, Wei Wang, Afnan Mashat, and Hussain Shateeb. "Comparison of Water and Gas Tracers Field Breakthrough." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205863-ms.

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Abstract We are developing new classes of barcoded advanced tracers, which, compared to present commercial offerings, can be optically detected in an automated fashion. The eventual goal for the advanced tracers is to deploy cost-effective, ubiquitous, long-term, and full-field tracer tests in supporting large-scale waterflooding optimization for improved oil recovery. In this paper, we compare model predictions to breakthrough data from two field tests of advanced tracers in a pilot during water alternating gas (WAG) cycles, where gas tracer tests have recently been performed as well. Two advanced tracer injections were performed at the test site. For the first injection, only a dipicolinic acid based advanced tracer (DPA) was injected. For the second injection, DPA and a phenanthroline- based advanced tracer, 4,7-bis(sulfonatophenyl)-1,10-phenanthroline-2,9-dicarboxylic acid (BSPPDA), was injected in conjunction with a commercially available fluorobenzoic acid-based tracer (FBA) to benchmark their performance. Produced water samples were collected weekly for tracer analysis. Both newly developed 2D-high performance liquid chromatography/time-resolved fluorescence optical detection method (2D-HPLC/TRF) and liquid chromatography-mass spectrometry (LC-MS) were used to construct the breakthrough curves for the advanced tracers. In parallel, gas chromatography-mass spectrometry (GC-MS) was used to detect FBA tracer. Gas tracer tests have been performed on the same field. Since DPA, BSPPDA and FBA tracers were water tracers as designed, they were expected to appear in between gas tracer breakthroughs, and we observed exactly that for BSPPDA and FBA. Unexpectedly, the DPA predominantly appeared along with gas tracer breakthroughs, suggesting its favorable compatibility with the gas phase. We suspect the presence of some gas components rendered the medium more acidic, which likely protonates DPA molecules, thereby alters its hydrophilicity. A wealth of information could be gathered from the field tests. First, all tracers survived not only the harsh reservoir conditions but also the irregular WAG injections. Their successful detection from the producers suggested robustness of these materials for reservoir applications. Second, the breakthrough curves of the BSPPDA tracers using optical detection method were very similar to those of FBA tracers detected by GC-MS, substantiating the competency of our in-house materials and detection methods to the present commercial offerings. Finally, even though DPA has passed prior lab tests as a good water tracer, its high solubility to gas phase warrants further investigation. This paper summarizes key results from two field trials of the novel barcoded advanced tracers, of which both the tracer materials and detection methods are new to the industry. Importantly, the two co- injected advanced tracers showed opposite correlations to the gas tracers, highlighting the complex physicochemical interactions in reservoir conditions. Nevertheless, the information collected from the field trials is invaluable in enabling further design and utilization of the advanced tracers in fulfilling their wonderful promises.

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Mazurkiewicz, Paul. "A Fast and Inexpensive Product Screening Method for R.O.H.S. Compliance." In ISTFA 2005. ASM International, 2005. http://dx.doi.org/10.31399/asm.cp.istfa2005p0451.

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Abstract The Directive 2002/95/EC (referred as ROHS) of the European Parliament and of the Council restricts the use of certain hazardous substances in electrical and electronic equipment. This article reports on a fast and inexpensive methodology for rapidly screening entire electronic assemblies that acts as a high-level screen for obvious ROHS violations. Using this methodology, this lab has been able to check entire product lines for basic ROHS compliance and has identified many cases where vendors needed to be informed of ROHS violations before a product could be certified as ROHS compliant. Four tests are employed. Each of them is described, along with the basic theory behind the test: pre-screening with x-ray fluorescence spectroscopy and electron dispersion spectroscopy; detection and identification of polybrominated biphenyl ethers using gas chromatography - mass spectrometry; and chromium 6 colorimetric testing based on diphenylcarbazide.

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Chen, Juan, Xiaoping Yu, Yafei Guo, and Tianlong Deng. "Chromatography coupled atomic fluorescence spectrometry for mercury species analysis." In 2011 International Conference on Consumer Electronics, Communications and Networks (CECNet). IEEE, 2011. http://dx.doi.org/10.1109/cecnet.2011.5768458.

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Blebea, Nicoleta Mirela, and Simona Negreș. "METHODS FOR QUANTIFICATION OF THE MAIN CANNABINOIDS IN CBD OIL." In GEOLINKS Conference Proceedings. Saima Consult Ltd, 2021. http://dx.doi.org/10.32008/geolinks2021/b1/v3/13.

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Cannabidiol (CBD) is an alkaloid present in Cannabis sativa, together with tetrahydrocannabinol (THC) and more than 120 other substances belonging to a group of compounds named cannabinoids. Due to the continuous increased usage of CBD oils, it became necessary to be developed efficient methods for the identification of its compounds and especially for the characterization of the cannabinoids from the commercial specimens. Cannabinoids may be detected by many and different analytical methods, including immunoassays (EMIT®, Elisa, fluorescent polarization, radioimmunotest), techniques of flat chromatography: classic thin layer chromatography (TLC), optimum performance laminar chromatography (OPLC) and multiple development automatization (AMD), gas chromatography-mass spectrometry (GC-MS), high-performance liquid chromatography-mass spectrometry (HPLC-MS). Ultraviolet signal (UV) is used for the quantification of major cannabinoids and the mass spectrometer is used for the quantification of minor cannabinoids. The purpose of this study was to compare the performances of TLC, Ultra High-Performance Liquid chromatography with Photodiode Array Detection (UHPLC with PDA) and LC-MS/ MS technique for the qualitative and quantitative determination of cannabinoids in 3 commercial oils with CBD. Having in view that CBD may be found in many forms of oils, on the legal market of the internet, we believe that the development of a method for the qualitative and quantitative determination may be an interesting subject for the pharmaceutical professional persons.

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Shouhui Dai, Min Wang, Jing Qiu, Hui Yang, and Fuhua Wang. "Speciation analysis of arsenic in fruits and vegetables by high performance liquid chromatography-hydride generation-atomic fluorescence spectrometry with ultrasonic extraction." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5966002.

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Nan, Xue-Jiao, Xiao-Ping Yu, Ya-Fei Guo, and Tian-Long Deng. "Function and Effects of L-cysteine on the Speciation Analysis of Mercury by High Performance Liquid Chromatography Coupled with on-line Cold Vapor Generation Atomic Fluorescence Spectrometry." In 2nd 2016 International Conference on Sustainable Development (ICSD 2016). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/icsd-16.2017.113.

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Seo, Young Woo, Andrey Ovcharenko, Yongqi Yan, and Frank E. Talke. "Experimental Investigation of the Effect of Hydrocarbon Oil Contamination on a Disk Surface." In ASME 2016 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/isps2016-9610.

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Hydrocarbon oil is used to lubricate the spindle motor as well as the pivot actuator arm in current hard disk drives. Previous investigations using molecular dynamics have shown that hydrocarbon oil can contaminate the head-disk interface. In this paper, an experimental study is conducted to investigate the mechanism of hydrocarbon oil contamination on the disk surface using contact angle measurements, atomic force microscopy (AFM), ellipsometry, and gas chromatography mass spectrometry (GC-MS).

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Chatterjee, Piyali, and Tapas Chakraborty. "ISOMERIC DISTRIBUTION OF FLUORESCENT LASER DYE DCM IN METHANOL AND IN GAS PHASE: AN ION MOBILITY MASS SPECTROMETRIC STUDY IN COMBINATION WITH HIGH PERFORMANCE LIQUID CHROMATOGRAPHY." In 2020 International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2020. http://dx.doi.org/10.15278/isms.2020.wi07.

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