Use of Soil Amendments to Reduce the Bioavailability of Lead, Zinc and Cadmium In Situ

Use of Soil Amendments to Reduce the Bioavailability of Lead, Zinc and Cadmium In Situ			June 2003
Author(s): Brown, S. (Univ. of Washington, Seattle); R. Chaney & J. Hallfrisch (USDA ARS Beltsville, MD); J. Ryan (U.S. EPA, Cincinnati, OH); W. Berti (Dupont Central Research & Development, Newark, DE)		Proceedings of the 7th International Conference on the Biogeochemistry of Trace Elements (7th ICOBTE), 15-19 June 2003, Uppsala, Sweden. Book of Abstracts. Vol I-II, p 10-11, 2003
Mine:	Waste Type: soil	Contaminant(s): lead, cadmium, zinc	Technology Type: various amendments
Keywords: bioavailability, lead, zinc, cadmium
Abstract: Both lab studies and a field trial were conducted to test the abilities of a range of amendments to reduce the bioavailability of Pb, Zn, and Cd in situ in soil from a mining district. Amendments included P added as triple super phosphate, H3PO4, and rock phosphate; a high Fe municipal biosolids compost, and Ferich, a high Fe byproduct of titanium processing. Changes in bioavailability were measured through an in vivo trial with weanling rats, plant tissue metal concentrations, and a physiologically based extraction test. The results indicate that it is possible to reduce the bioavailability of Pb, Cd, and Zn in field and lab studies; however, response across different environments, endpoints, and elements of concern will vary.
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