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- W2955132371 abstract "Methyl bromide (CH3Br) and methyl chloride (CH3Cl) significantly contribute to stratospheric ozone depletion. The atmospheric budgets of both compounds are unbalanced with known degradation processes outweighing known emissions. Stable isotope analysis may be capable to identify and quantify emissions and to achieve a balanced budget. Degradation processes do, however, cause isotope fractionation in methyl halides after emission and hence knowledge about these processes is a crucial prerequisite for any isotopic mass balance approach. In the current study, triple-element isotope analysis (2H, 13C, 37Cl/81Br) was applied to investigate the two main abiotic degradation processes of methyl halides (CH3X) in fresh and seawater: hydrolysis and halide exchange. For CH3Br, nucleophilic attack by both H2O and Cl– caused significant primary carbon and bromine isotope effects accompanied by a secondary inverse hydrogen isotope effect. For CH3Cl only nucleophilic substitution by H2O was observed at significant rates causing large primary carbon and chlorine isotope effects and a secondary inverse hydrogen isotope effect. Observed dual-element isotope ratios differed slightly from literature values for microbial degradation in water and hugely from radical reactions in the troposphere. This bodes well for successfully distinguishing and quantifying degradation processes in atmospheric methyl halides using triple-element isotope analysis." @default.
- W2955132371 created "2019-07-12" @default.
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- W2955132371 date "2019-06-25" @default.
- W2955132371 modified "2023-10-09" @default.
- W2955132371 title "Isotopic Characterization (<sup>2</sup>H, <sup>13</sup>C, <sup>37</sup>Cl, <sup>81</sup>Br) of Abiotic Degradation of Methyl Bromide and Methyl Chloride in Water and Implications for Future Studies" @default.
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- W2955132371 doi "https://doi.org/10.1021/acs.est.9b02165" @default.
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