Results 141 to 150 of about 116,875 (192)
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Compound-Specific Sulfur Isotope Analysis of Petroleum Gases
Analytical Chemistry, 2017We describe a simple, sensitive, and robust method for sulfur isotope ratio (34S/32S) analysis of ppm-level organic sulfur compounds (OSCs) in the presence of percent-level H2S. The method uses a gas chromatograph (GC) coupled with a multicollector inductively coupled plasma mass spectrometer (MC-ICPMS).
Ward Said-Ahmad +7 more
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Pitfalls in compound-specific isotope analysis of environmental samples
Analytical and Bioanalytical Chemistry, 2007In the last decade compound-specific stable isotope analysis (CSIA) has evolved as a valuable technique in the field of environmental science, especially in contaminated site assessment. Instrumentation and methods exist for highly precise measurements of the isotopic composition of organic contaminants even in a very low concentration range ...
Blessing, Michaela +2 more
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Compound-specific Stable Isotope Analysis
2012The use of Compound-specific Stable Isotope Analysis (CSIA) is increasing in many areas of science and technology for source allocation, authentication, and characterization of transformation reactions. Until now, there have been no textbooks available for students with an analytical chemical background or basic introductory books emphasising the ...
Jochmann, Maik, Schmidt, Torsten Claus
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Compound-Specific Stable Carbon Isotope Analysis of Chlorofluorocarbons in Groundwater
Analytical Chemistry, 2015Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs), controlled substances due to their role in stratospheric ozone loss, also occur as dissolved contaminants in groundwaters. Stable carbon isotopic signatures may provide valuable new information on the fate of these compounds as has been seen for other priority hydrocarbon contaminants ...
Axel, Horst +2 more
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Polycyclic Aromatic Hydrocarbon Purification Procedures for Compound Specific Isotope Analysis
Environmental Science & Technology, 2005Purification and isotope analysis methods were developed to accurately measure the stable carbon isotope ratio of individual PAHs in environmental samples. Sample extracts were separated into several fractions by column chromatography and were purified by high-performance liquid chromatographic and thin-layer chromatographic techniques.
Moonkoo, Kim +2 more
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Environmental Science & Technology, 2013
High-temperature pyrolysis conversion of organic analytes to H(2) in hydrogen isotope ratio compound-specific isotope analysis (CSIA) is unsuitable for chlorinated compounds such as trichloroethene (TCE) and cis-1,2-dichloroethene (DCE), due to competition from HCl formation.
Tomasz, Kuder, Paul, Philp
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High-temperature pyrolysis conversion of organic analytes to H(2) in hydrogen isotope ratio compound-specific isotope analysis (CSIA) is unsuitable for chlorinated compounds such as trichloroethene (TCE) and cis-1,2-dichloroethene (DCE), due to competition from HCl formation.
Tomasz, Kuder, Paul, Philp
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Environmental Science & Technology, 2008
Hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) is a common contaminant at explosives production sites. Here, we report on the use of compound-specific isotope analysis of RDX to obtain delta(15)N and delta(18)O enrichment factors during biodegradation in batch cultures.
Bernstein, Anat +6 more
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Hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) is a common contaminant at explosives production sites. Here, we report on the use of compound-specific isotope analysis of RDX to obtain delta(15)N and delta(18)O enrichment factors during biodegradation in batch cultures.
Bernstein, Anat +6 more
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Environmental Science & Technology, 2008
Nitroaromatic compounds that contaminate soil and groundwater can be biodegraded by different, sometimes competing reaction pathways. We evaluated the combined use of compound-specific stable C and N isotope analysis to distinguish between enzymatic nitrobenzene oxidation by Comamonas sp.
Thomas B, Hofstetter +4 more
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Nitroaromatic compounds that contaminate soil and groundwater can be biodegraded by different, sometimes competing reaction pathways. We evaluated the combined use of compound-specific stable C and N isotope analysis to distinguish between enzymatic nitrobenzene oxidation by Comamonas sp.
Thomas B, Hofstetter +4 more
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Compound‐specific isotope analysis of the organic constituents in carbonaceous chondrites
Mass Spectrometry Reviews, 2001Abstract I. Introduction 111 II. Stable Isotopes 112 III. CSIA 112 IV. CSIA of Organic Compounds from Carbonaceous Chondrites 115 A. Carbon 115 B. Nitrogen 118 C. Sulfur 118 D. Hydrogen 118 V. History of Meteoritic Organic Matter 118 Acknowledgments 118 References 118 The carbonaceous chondrite meteorites contain
M A, Sephton, I, Gilmour
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Fingerprinting TCE in a Bedrock Aquifer Using Compound‐Specific Isotope Analysis
Groundwater, 2012A dual isotope approach based on compound‐specific isotope analysis (CSIA) of carbon (C) and chlorine (Cl) was used to identify sources of persistent trichloroethylene (TCE) that caused the shut‐down in 1994 of a municipal well in an extensive fractured dolostone aquifer beneath Guelph, Ontario. Several nearby industrial properties
Paulo, Lojkasek-Lima +3 more
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