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Abstract
The reductive dechlorination of carbon tetrachloride (CT) was examined in aqueous suspensions of sulfate green rust (GRSO4) amended with either Co(II), Cr(VI), Hg(II), Mn(II), Mo(VI), Ni(II), Pb(II), V(III), or Zn(II). The rate of CT reduction in the Hg(II)-amended GRSO4 suspension was ~1000 times faster than in unamended GRSO4. CT reduction was moderately enhanced in the Cr(III) , Mn(II)-, Mo(VI)-, Pb(II)-, and V(III)-amended systems. No increase in the rate of CT reduction was observed in the Co(II)-, Ni(II)-, or Zn(II)-amended systems. Chloroform (CF) was the major product of CT reduction, with minor amounts of methane and traces of ethene, and ethane; dichloromethane and chloromethane were not observed. A reaction pathway scheme is proposed in which CT is reduced primarily to chloroform (CF) and minor non-chlorinated end products, largely through a series of one-electron reductions forming radicals and carbenes/carbenoids.
