Mackinawite, an iron monosulfide, has been demonstrated to be an expected reductant for chlorinated natural mixes under anaerobic conditions. Chlorinated natural mixes are frequently found with inorganic contaminants. This examination explores the effect of different change metals on the reductive dechlorination by mackinawite utilizing a promptly degradable chlorinated natural compound, hexachloroethane (HCA). Various classes of change metals show particular examples in their effect on the HCA dechlorination:  10-3 M Cr(III) and Mn(II) (hard metals) diminished the dechlorination rates, while 10-4, 10-3, and 10-2 M Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) (middle of the road/delicate metals) expanded the rates. The tried hard metals, because of their frail partiality for sulfides, are thought to frame surface accelerates of hydroxides around FeS under the test conditions with these hydroxides impeding the electron move among FeS and HCA. Because of their high partiality for sulfides, notwithstanding, the tried halfway/delicate metals can respond with FeS in different ways:  precipitation of unadulterated metal sulfides (MS), arrangement of metal-subbed FeS by cross section trade, and coprecipitation of the blended sulfides in a Fe−M−S framework. Fe(II), discharged because of the association of FeS with moderate/delicate metals, upgrades the HCA dechlorination at the portions of 10-4 and 10-3 M through sorbed or broke down Fe(II) species, while Fe(OH)2(s) framed at the higher portion of 10-2 M likewise improves the reductive dechlorination.