Characteristic of soils and behavior of hexavalent chromium in soil-water interaction

Chromium exists in two forms mainly Cr3+ and Cr6+, and out of the two forms the later one is highly toxic and is documented as high priority pollutant. In order to investigate the extent and degree of heavy metal contamination in soils and sediments influenced by past mining activities, and to estimate the effects of the various soils on Cr speciation were examined. Experimental results on the kinesics of chromate reduction indicate that residual amounts of ferrous iron in weathering minerals can act as reductions for oxidized aqueous species. Chromium reduction by ferrous ion is used an oxidation-reduction reaction. The ferrous uses in particular that it become ferric after having reduced Cr6+ element in Cr3+. In this study, we examined relations with pH-Eh of the solution while examining the iron contents and removal rate in the soils of Cr6+.