Use of carbon stable isotope to investigate chloromethane formation in the electrolytic dechlorination of trichloroethylene [An article from: Journal of Hazardous Materials]

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Description:
Carbon stable isotope trichloroethylene (^1^3C TCE) was used to investigate the formation of chloromethane (CM) during the electrolytic dechlorination of trichloroethylene (TCE) at a granular-graphite packed cathode. A method was developed to use a conventional GC/MS to analyze and quantify regular and ^1^3C TCE and their dechlorination products. The concentration of a ^1^3C compound can be calculated, based on the concentration of its regular counterpart, from the response ratio of two fragments of different mass per charge values from the compounds in a sample and two characteristic MS spectrum ratios: one is the response ratio of the two fragments of the regular compound, and the other is the response ratio of the corresponding fragments of the regular and ^1^3C compounds at the same concentrations. The method was used to analyze the regular and ^1^3C compounds observed in an experiment of dechlorination in an ammonium acetate solution that contained both regular TCE and ^1^3C TCE. Results of analysis confirmed that CM was not a direct product of TCE dechlorination at the granular graphite cathode that cis-DCE was an intermediate product of TCE dechlorination, and that 1,1-DCE was not a dechlorination product.