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Lead bioaccessibility in 12 contaminated soils from China: correlation to lead relative bioavailability and lead in different fractions

Li, Jie; Li, Kan; Cave, Mark; Li, Hong-Bo; Ma, Lena Q.. 2015 Lead bioaccessibility in 12 contaminated soils from China: correlation to lead relative bioavailability and lead in different fractions. Journal of Hazardous Materials, 295. 55-62. 10.1016/j.jhazmat.2015.03.061

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Abstract/Summary

This study investigated the relationship between Pb relative bioavailability (RBA) and bioaccessibility, and their relationships with Pb in different pools in soils. Twelve Pb-contaminated soils representing different contamination sources from China were analyzed for Pb bioaccessibility using four in vitro methods (UBM, SBRC, IVG, and PBET), Pb-RBA using a mouse blood model, and Pb fractionation using sequential extraction. Lead bioaccessibility in the gastric phase (GP) and Pb-RBA was generally lower in mining soils (0.46–29% and 7.0–26%) than smelting (19–92% and 31–84%) and farming soils (13–99% and 51–61%), with more Pb in the residual fraction in mining soils. Lead bioaccessibility varied with assays, with SBRC (3.0–99%) producing significantly higher bioaccessible Pb than other assays (0.46–84%) in the gastric phase. However, Pb bioaccessibility in the intestinal phase (IP) of all assays sharply decreased to 0.01–20% possibly due to Pb sorption to solid phase at higher pH. Lead bioaccessibility by UBM-GP assay was best correlated with Pb-RBA (r2 = 0.67), followed by IVG–GP (r2 = 0.55). Among different Pb fractions, strong correlation was found between Pb bioaccessibility/Pb-RBA and the sum of exchangeable and carbonate fractions. Our study suggested that UBM-GP assay has potential to determine Pb bioaccessibility in contaminated soils in China.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.jhazmat.2015.03.061
ISSN: 03043894
Date made live: 09 Jul 2015 13:33 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/511289

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