Demonstration of Compound-Specific Isotope Analysis of Hydrogen Isotope Ratios in Chlorinated Ethenes
| Autor: | Tomasz Kuder, Paul Philp |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Carbon Isotopes
Chromatography Gas Aqueous solution Halogenation Compound specific Hydrogen isotope Radiochemistry Uncertainty chemistry.chemical_element Benzene General Chemistry Environment Ethylenes Reference Standards Mass Spectrometry Dichloroethylenes Trichloroethylene Chromium chemistry Isotope Labeling Environmental chemistry Environmental Chemistry Pyrolysis Hydrogen Isotope analysis |
| Zdroj: | Environmental Science & Technology. 47:1461-1467 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/es303476v |
| Popis: | 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. For this reason, the information potential of hydrogen isotope ratios of chlorinated ethenes remains untapped. We present a demonstration of an alternative approach where chlorinated analytes reacted with chromium metal to form H(2) and minor amounts of HCl. The values of δ(2)H were obtained at satisfactory precision (± 10 to 15 per thousand), however the raw data required daily calibration by TCE and/or DCE standards to correct for analytical bias that varies over time. The chromium reactor has been incorporated into a purge and trap-CSIA method that is suitable for CSIA of aqueous environmental samples. A sample data set was obtained for six specimens of commercial product TCE. The resulting values of δ(2)H were between -184 and +682 ‰, which significantly widened the range of manufactured TCE δ(2)H signatures identified by past work. The implications of this finding to the assessment of TCE contamination are discussed. |
| Databáze: | OpenAIRE |
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