Origin of a Mixed Brominated Ethene Groundwater Plume:Contaminant Degradation Pathways and Reactions

BRADLEY M.PATTERSON; ELIZABETH COHEN; HENNING PROMMER

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Origin of a Mixed Brominated Ethene Groundwater Plume:Contaminant Degradation Pathways and Reactions

机译：Origin of a Mixed Brominated Ethene Groundwater Plume:Contaminant Degradation Pathways and Reactions

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On the basis of a combination of laboratory microcosm experiments,column sorption experiments,and the current spatial distribution of groundwater concentrations,the origin of a mixed brominated ethene groundwater plume and its degradation pathway were hypothesized.The contaminant groundwater plume was detected downgradient of a former mineral processing facility,and consisted of tribromoethene (TriBE),c/s-1,2-dibromoethene (c-DBE),trans-1,2-dibromoethene (f-DBE),and vinyl bromide (VB).The combined laboratory and field data provided strong evidence that the origin of the mixed brominated ethene plume was a result of dissolution of the dense non-aqueous-phase liquid 1,1,2,2-tetrabromoethane (TBA) at the presumed source zone,which degraded rapidly (half-life of 0.2 days) to form TriBE in near stoichiometric amounts.TriBE then degraded (half-life of 96 days) to form c-DBE,f-DBE,and VB via a reductive debromination degradation pathway.Slow degradation of c-DBE (half-life >220 days),f-DBE (half-life 220 days),and VB (half-life >220 days) coupled with their low retardation coefficients (1.2,1.2,and 1.0 respectively) resulted in the formation of an extensive mixed brominated ethene contaminant plume.Without this clearer understanding of the mechanism for TBA degradation,the origin of the mixed brominated ethene groundwater contamination could have been misinterpreted,and inappropriate and ineffective source zone and groundwater remediation techniques could be applied.

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《Environmental Science & Technology: ES&T》 |2007年第4期|1352-1358|共7页
作者
BRADLEY M.PATTERSON; ELIZABETH COHEN; HENNING PROMMER;
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CSIRO Land and Water,Private Bag No.5,Wembley,WA 6913,Faculty of Life and Physical Sciences,University of Western Australia,Crawley,WA 6907,Colder Associates,P.O.Box 1914,West Perth,WA 6872,and Rio Tinto Technical Services,Ground Floor,120 Christie S;

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正文语种英语
中图分类环境化学;
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Origin of a Mixed Brominated Ethene Groundwater Plume:Contaminant Degradation Pathways and Reactions

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