Fig. 4. Profiles of Cr in soils contaminated with 1000 mg L^-1 Cr(VI) solutions, then exposed to 4000 mg L^-1 organic carbon (OC) solutions (Days 5 [circles], 84 [solid triangles], and 205 [squares], relative to addition of OC). (A) Measured profiles of total Cr concentrations. (B) Measured profiles of Cr(VI) to total Cr concentration ratios, with the predicted profile at the initial addition of Cr(VI) shown as a dashed line.

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