化学
氯
质谱法
氯同位素
同位素
同位素比值质谱法
同位素分析
气相色谱法
同位素稀释
电感耦合等离子体质谱法
气相色谱-质谱法
环境化学
氯化物
乙草胺
色谱法
有机化学
杀虫剂
物理
生物
量子力学
生态学
农学
作者
Christina Lihl,Julian Renpenning,Steffen Kümmel,Faina Gelman,Heide K. V. Schürner,Martina Daubmeier,Benjamin Heckel,Aileen Melsbach,Anat Bernstein,Orfan Shouakar-Stash,Matthias Gehre,Martin Elsner
出处
期刊:Analytical Chemistry
[American Chemical Society]
日期:2019-08-27
卷期号:91 (19): 12290-12297
被引量:11
标识
DOI:10.1021/acs.analchem.9b02463
摘要
Increasing applications of compound-specific chlorine isotope analysis (CSIA) emphasize the need for chlorine isotope standards that bracket a wider range of isotope values in order to ensure accurate results. With one exception (USGS38), however, all international chlorine isotope reference materials (chloride and perchlorate salts) fall within the narrow range of one per mille. Furthermore, compound-specific working standards are required for chlorine CSIA but are not available for most organic substances. We took advantage of isotope effects in chemical dehalogenation reactions to generate (i) silver chloride (CT16) depleted in 37Cl/35Cl and (ii) compound-specific standards of the herbicides acetochlor and S-metolachlor (Aceto2, Metola2) enriched in 37Cl/35Cl. Calibration against the international reference standards USGS38 (−87.90 ‰) and ISL-354 (+0.05 ‰) by complementary methods (gas chromatography-isotope ratio mass spectrometry, GC-IRMS, versus gas chromatography-multicollector inductively coupled plasma mass spectrometry, GC-MC-ICPMS) gave a consensus value of δ37ClCT16 = −26.82 ± 0.18 ‰. Preliminary GC-MC-ICPMS characterization of commercial Aceto1 and Metola1 versus Aceto2 and Metola2 resulted in tentative values of δ37ClAceto1 = 0.29 ± 0.29 ‰, δ37ClAceto2 = 18.54 ± 0.20 ‰, δ37ClMetola1 = −4.28 ± 0.17 ‰ and δ37ClMetola2 = 5.12 ± 0.27 ‰. The possibility to generate chlorine isotope in-house standards with pronounced shifts in isotope values offers a much-needed basis for accurate chlorine CSIA.
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