Bioavailable soil Pb minimized by in situ transformation to plumbojarosite
Ranju R. Karna, Matthew Noerpel, Clay Nelson, Brittany Elek, Karen Herbin-Davis, Gary Diamond, Karen D. Bradham, David J. Thomas, Kirk G. Scheckel
Abstract
test) in mice that consumed diets amended with remediated soils than with U soils. Estimated RBA for Pb in both remediated natural soils and Pb-mineral spiked soils were reduced by >90% relative to Pb RBA for U soils, which is substantially more effective than other soil amendments, including P. X-ray absorption spectroscopy showed that >90% of all Pb species in remediated soils were converted to PLJ, and ingested PLJ was not chemically transformed during gastrointestinal tract transit. Post treatment neutralization of soil pH did not affect PLJ stability, indicating the feasibility in field conditions. These results suggest that formation of PLJ in contaminated soils can reduce the RBA of Pb and minimize this medium's role as a source of Pb exposure for young children.