| This research is a preliminary study of the dehalogenation of halogenated aliphatic compounds in the presence of iron powder. The haloaliphatics evaluated in this study include carbon tetrachloride (CT), 1,1,1,-trichloroethane (TCA), trichloroethylene (TCE) and tetrachloroethylene (PCE). Variables evaluated include temperature, pH, haloaliphatics concentration and buffer type. Pseudo-first-order kinetics were used to quantify the reaction kinetics of CT and TCE; zero order kinetics were used for TCA.; In the iron-mediated reactions, phosphate appears to play a central role in promoting dechlorination. The order of reactivity was: CT {dollar}>{dollar} 1,1,1,-TCA {dollar}>{dollar} TCE {dollar}>{dollar} PCE. The reaction rate was temperature and pH dependent. Highest rates occurred at high temperature and low pH. |
