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ABIOTIC DEHALOGENATION OF 1,2-DICHLOROETHANE AND 1,2-DIBROMOETHANE IN AQUEOUS SOLUTION CONTAINING HYDROGEN SULFIDE
Citation:
Barbash, J. AND M. Reinhard. ABIOTIC DEHALOGENATION OF 1,2-DICHLOROETHANE AND 1,2-DIBROMOETHANE IN AQUEOUS SOLUTION CONTAINING HYDROGEN SULFIDE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/352 (NTIS PB90216284), 1989.
Description:
The detection of significant levels of halogenated aliphatic contaminants in groundwater resources in the United States has spurred a considerable effort to understand the various mechanisms--both microbiological and abiotic--by which these compounds may be transformed. n aerobic environments, the abiotic reactions that predominate are elimination of hydrogen halide (dehydrohalogenation) and nucleophilic substitution by H2O (hydrolysis). ittle research has examined the rates and pathways of abiotic reactions that may be significant under hypoxic conditions. o gain a better understanding of the fate of holoaliphatic compounds in oxygen-deficient natural waters, we have examined the dehalogenation of 1,2-dichloroethane (1,2-DCA) and 1,2-dibromethane (EDB) in phosphate buffer alone, and in phosphate buffer containing hydrogen sulfide. inetic runs were conducted at pH 7 over the temperature range from 25 to 87.5 degrees C. hosphate buffer catalyzed the hydrolysis of both 1,2-DCA and EDB. his catalysis was attributed to the buffer anion HPO42-.
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ABIOTIC DEHALOGENATION OF 1,2-DICHLOROETHANE AND 1,2-DIBROMOETHANE IN AQUEOUS SOLUTION CONTAINING HYDROGEN SULFIDE