Bioavailable soil Pb minimized by in situ transformation to plumbojarosite

Karna, Ranju R.; Noerpel, Matt R.; Nelson, Clay; Elek, Brittany; Herbin-Davis, Karen; Diamond, Gary; Bradham, Karen; Thomas, David J.; Scheckel, Kirk G.

doi:10.1073/pnas.2020315117

Bioavailable soil Pb minimized by in situ transformation to plumbojarosite

Journal Article · Mon Dec 21 00:00:00 EST 2020 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.2020315117· OSTI ID:1761437

Karna, Ranju R. ^[1]; ^[2]; Nelson, Clay ^[3]; Elek, Brittany ^[4]; Herbin-Davis, Karen ^[4]; Diamond, Gary ^[5]; Bradham, Karen ^[4]; ^[4]; ^[2]

US Army Engineer Research and Development Center, Vicksburg, MS (United States). Bennett Aerospace, Inc.
US Environmental Protection Agency (EPA), Cincinnati, OH (United States)
BioGeoChem Scientific LLC, Austin, TX (United States)
US Environmental Protection Agency (EPA), Research Triangle Park, NC (United States)
SRC, Inc., North Syracuse, NY (United States)

Exposure to lead (Pb) during early life has persistent adverse health effects. During childhood, ingestion of bioavailable Pb in contaminated soils can be a major route of Pb absorption. Remediation to alter physiochemical properties of soil-borne Pb can reduce Pb bioavailability. Our laboratory-based approach for soil Pb remediation uses addition of iron (Fe) sulfate and application of heat to promote formation of plumbojarosite (PLJ), a sparingly soluble Pb-Fe hydroxysulfate mineral. We treated two soils with anthropogenic Pb contamination and samples of clean topsoil spiked with various Pb compounds (i.e., carbonate, chloride, phosphate [P], or sulfate) to convert native Pb species to PLJ and used a mouse assay to assess relative bioavailability (RBA) of Pb in untreated (U) and remediated soils. Bone and blood Pb levels were significantly lower (P < 0.001, Student's t 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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: E.I. DuPont de Nemours and Co.; Northwestern University; The Dow Chemical Company; USDOE Office of Science (SC); USEPA

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1761437

Alternate ID(s):: OSTI ID: 1763133
OSTI ID: 1764294

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 3 Vol. 118; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Bioavailable soil Pb minimized by in situ transformation to plumbojarosite

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