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IN SITU LEAD IMMOBILIZATION BY APATITE
Citation:
Ma, Q., S. Traina, T.J. Logan, AND J. Ryan. IN SITU LEAD IMMOBILIZATION BY APATITE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-95/309, 1993.
Description:
Lead contamination is of environmental concern due to its effect on human health. he purpose of this study was to develop a technology to immobilize Pb in situ in contaminated soils and wastes using apatite. ydroxyapatite [Ca10(PO4)6(OH)2]was reacted with aqueous Pb, resinexchangeable Pb, and Pb-contaminated soil material. he effectiveness of natural apatite to attenuate Pb was also tested. ydroxyapatite reduced initial Pb concentrations of 5-500 mg L-1 to 0.18-19.7 ug L-1. queous Pb in Pb-contaminated soil materials was reduced from 2273 to 36 ug L-1 after reaction with hydroxyapatite. e hypothesize that Pb was immobilized by dissolution of hydroxyapatite and precipitation of hydroxypyro-morphite [Ca10(PO4)6(OH)2]. he effective removal of Pb from aqueous solution, exchange resin, and Pb-contaminated soil material suggests that apatite has the potential to immobilize Pb in situ in Pb-contaminated soils and wastes.