The extensive use of chlorinated hydrocarbons (especially chlorinated alkanes and alkenes; CAEs) as solvents, degreasers, dry-cleaning agents, and fumigants has resulted in localized contamination of soils and aquifers, particularly in regard to carbon tetrachloride (CT; CCl4), chloroform (CF; CHCl3), methylene chloride (DCM; CH2Cl2), 1,1,1-trichloroethane (C2H3Cl3), 1,2dichloroethane (C2H4Cl2), perchloroethene (PCE; C2Cl4), and trichloroethene (TCE; C2HCl3) . Given the human health and ecotoxicity issues associated with CAEs, there has been a concerted effort to develop approaches for the remediation of CAE contaminated environments, often by means of reductive dechlorination to lesser-or non-chlorinated products . Reductive dechlorination of CAEs by green rust is highly variable, with some, such as CT and hexachloroethane (C2Cl6) undergoing rapid reduction, and others such as chloromethane (CH3Cl) and chloroethane (C2H5Cl) being completely unreactive . However, the rates and extents of CAE reductive dechlorination by green rust can be enhanced by the presence of amendments that can facilitate electron transfer from green rust to the CAE , and the transition metals Cu(II), Ag(I), Pt(IV), and Au(III) are particularly effective in that regard .