Evaluation of Calcium Polysulfide as a Reducing Agent for the Restoration of a Cr(VI)-Contaminated Aquifer.

This study aims at investigating the efficiency of calcium polysulfide (CPS) as a reducing agent for decontamination of a heavily Cr(VI)-contaminated aquifer. Batch experiments were carried out in order to evaluate the effect of time, CPS concentration and the presence of soil on the reductive behavior of CPS. CPS was used at several stoichiometric excesses with respect to Cr(VI) concentration detected in the contaminated groundwater.