METHOD OF SUPPRESSING ELUTION OF ARSENIC FROM SOIL CONTAMINATED BY ARSENIC

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PROBLEM TO BE SOLVED : To provide a simple and economically superior method of suppressing the elution of arsenic from soil, which is capable of suppressing arsenic in both of trivalent and pentavalent forms from a soil contaminated by arsenic and satisfying the soil elution standard by elution test conforming to the soil contamination countermeasure law. SOLUTION : By the method, an arsenic concentration of 0.01 mg/L or lower being a standard soil elution can be achieved by a small consumption of rare earth salts, by controlling the pH of a soil to be 6-9 by adding a rare earth salt solution containing cerium as a main component and a slaked lime water-dispersed liquid at the same time or separately to the soil contaminated by trivalent or pentavalent arsenic. COPYRIGHT : (C)2008, JPO&INPIT