DOI: 10.1021/acs.est.9b06139
论文题名: Chlorine Isotope Fractionation of the Major Chloromethane Degradation Processes in the Environment
作者: Keppler F. ; Barnes J.D. ; Horst A. ; Bahlmann E. ; Luo J. ; Nadalig T. ; Greule M. ; Hartmann S.C. ; Vuilleumier S.
刊名: Environmental Science and Technology
ISSN: 0013936X
出版年: 2020
卷: 54, 期: 3 语种: 英语
Scopus关键词: Biodegradation
; Chlorine
; Isotopes
; Troposphere
; Bacterial degradation
; Biotic process
; Carbon and hydrogens
; Chlorine isotope fractionations
; Degradation process
; Global cycling
; Marine environment
; Organochlorines
; Chlorine compounds
; carbon
; chlorine
; hydrogen
; hydroxyl group
; methyl chloride
; bacterium
; biodegradation
; chlorine isotope
; global change
; hydrogen
; hydroxyl radical
; isotopic fractionation
; organochlorine
; troposphere
; Article
; atmosphere
; bacterial growth
; dehalogenation
; fractionation
; hydrogen bond
; hydrolysis
; Leisingera methylohalidivorans
; marine environment
; mass fragmentography
; Methylobacterium extorquens
; microbial degradation
; nonhuman
; troposphere
; Bacteria (microorganisms)
; Leisingera methylohalidivorans
英文摘要: Chloromethane (CH3Cl) is an important source of chlorine in the stratosphere, but detailed knowledge of the magnitude of its sources and sinks is missing. Here, we measured the stable chlorine isotope fractionation (ϵCl) associated with the major abiotic and biotic CH3Cl sinks in the environment, namely, CH3Cl degradation by hydroxyl (·OH) and chlorine (·Cl) radicals in the troposphere and by reference bacteria Methylorubrum extorquens CM4 and Leisingera methylohalidivorans MB2 from terrestrial and marine environments, respectively. No chlorine isotope fractionation was detected for reaction of CH3Cl with ·OH and ·Cl radicals, whereas a large chlorine isotope fractionation (ϵCl) of -10.9 ± 0.7‰ (n = 3) and -9.4 ± 0.9 (n = 3) was found for CH3Cl degradation by M. extorquens CM4 and L. methylohalidivorans MB2, respectively. The large difference in chlorine isotope fractionation observed between tropospheric and bacterial degradation of CH3Cl provides an effective isotopic tool to characterize and distinguish between major abiotic and biotic processes contributing to the CH3Cl sink in the environment. Our findings demonstrate the potential of emerging triple-element isotopic approaches including chlorine to carbon and hydrogen analysis for the assessment of global cycling of organochlorines. Copyright © 2019 American Chemical Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159371
Appears in Collections: 气候变化与战略
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作者单位: Institute of Earth Sciences, Heidelberg University, Im Neuenheimer Feld 236, Heidelberg, 69120, Germany; Department of Geological Sciences, University of Texas, Austin, TX 78712, United States; Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research - UFZ, Permoserstr.15, Leipzig, 04318, Germany; Leibniz Institute for Baltic Sea Research Warnemünde, Seestrasse 15, Rostock, 18119, Germany; UMR 7156 CNRS Génétique Moléculaire, Génomique, Microbiologie, Université de Strasbourg, 4 allée Konrad Roentgen, Strasbourg, 67000, France; Max Planck Institute for Chemistry, Hahn-Meitner-Weg 1, Mainz, 55128, Germany
Recommended Citation:
Keppler F.,Barnes J.D.,Horst A.,et al. Chlorine Isotope Fractionation of the Major Chloromethane Degradation Processes in the Environment[J]. Environmental Science and Technology,2020-01-01,54(3)