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Current soil remediation principles for toxic metals have some limitations even though theyvary with different technologies. An alternative technology that transforms hazardous substances into non-hazardous ones would be environmentally beneficial. Objective of this research was to assess optimum con-ditions for Cr(VI) reduction in soils as influenced by ZVI (Zero-Valent Iron), organic matter and moisturecontent. The reduction ratio of Cr(VI) was increased from 37 to 40% as organic matter content increasedfrom 1.07 to 1.75%. In addition, Cr(VI) concentration was reduced as soil moisture content increased, butthe direct effect of soil moisture content on Cr(VI) reduction was less than 5% of the Cr(VI) reductionratio. However, combined treatment of ZVI (5%), organic matter (1.75%) and soil moisture (30%) effec-tively reduced the initial Cr(VI) to over 95% within 5 days and nearly 100% after 30 days by increasingoxidation of ZVI and concurrent reduction of Cr(VI) to Cr (III). The overall results demonstrated that ZVIwas effective in remediating Cr(VI) contaminated soils, and the efficiency was synergistic with the com-bined treatments of soil moisture and organic matter.Key Words:

Effect of Organic Matter and Moisture Content on Reduction of Cr(VI) in Soils by Zerovalent Iron