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Search Result from the July 2004 Issue

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USE OF SOIL AMENDMENTS TO REDUCE THE BIOAVAILABILITY OF LEAD, ZINC AND CADMIUM IN SITU
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 1-II, p 10-11, 2003

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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