Modelling Pb bioaccessibility in soils contaminated by mining and smelting activities

Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Julien CabocheGuido Rychen

Abstract

This investigation was undertaken to identify the most significant parameters that can be used to model the bioaccessibility of lead in contaminated soils. Twenty-five soil samples contaminated by two distinct sources of contamination (mining and smelting areas) were investigated in this work. Edaphic soil properties were determined using the classic techniques. Speciation and solid phase distribution of Pb were determined by sequential fractionation and physical analysis (XRD and SEM-EDX). Bioaccessibility of Pb was measured using the unified BARGE protocol on each soil samples and each residue following the different steps of the sequential extraction procedure. Results showed that Pb speciation varied according to the source of contamination. Pb gastric bioaccessibility ranged from 12% to 86% in mining soils and from 40% to 95% in smelting soils. Soil edaphic properties (pH, CEC, clays content or organic matter content) cannot be used to model Pb bioaccessibility as these parameters could not be extrapolated from on site to another. The differences in Pb bioaccessibility between the 25 soils were better reflected by the nature of the Pb-bearing minerals as characterized by sequential extractions. Soluble, exchangeable and ac...Continue Reading

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Citations

Nov 24, 2012·Chemistry Central Journal·Elise DeshommesMichèle Prévost
May 8, 2015·Environmental Science and Pollution Research International·Xiaodong ZhuChaoyang Wei
May 20, 2015·Environmental Geochemistry and Health·Xiaodong ZhuTao Liang
Dec 8, 2016·Journal of Exposure Science & Environmental Epidemiology·Veronica M Ngole-JemeSandile P Songca
Feb 28, 2013·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Mark R CaveHeather Harrison

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