Abstract

Vanitha Murugaiyan, S. Selvarajand P. Kamatchi Selvaraj

DOI : http://dx.doi.org/10.13005/ojc/340318

Present study explore the possibility of reducing toxic Cr(VI) to Cr(III) without adding acid externally to the level of regulatory norms. Trial experiments were carried out with standard solution containing Cr(VI) of 1976 mg/L to reveal the suitability of SnCl₂ as reducing agent for hazardous hexavalent chromium in the absence of mineral acid. Under the same conditions contaminated ground water from COPR dump site was examined. Complete reduction of Cr(VI) and level of total Cr to discharge limit were observed  within fifteen minutes for both simulated and contaminated water. This green chemistry approach and lower time duration for reduction is not reported earlier. The efficacy of the process is ascertained by analysing the other important heavy metals like Ni, Cu, Pb and Zn using AASP. Level of chloride, sulphate, BOD, TDS and pH of the treated water were also recorded.  Results imply that SnCl₂ effectively reduces mobile hexavalent chromium  to harmless Cr(III) in the absence of  acid.

Contaminated Groundwater; Hexavalent Chromium; Tin Chloride; Reduction and Precipitation

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