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• W2569431378 abstract "In this paper we review the physiological and geochemical factors affecting lead bioavailability, and particularly, the unique physical/chemical properties of lead derived from mining wastes based on both theory and empirical observations. The relationship between blood lead levels and soil lead concentrations derived from epidemiological studies indicates that lead in soil from mining sites appears to have less of an effect on blood lead levels in children than does lead at urban sites or sites with an active lead smelter. Differences in bioavailability of various lead species offers a plausible explanation for the relative differences in their impact on blood lead. In this paper, we evaluate from a physiological viewpoint aqueous solubility, absorption/desorption processes, and uptake mechanisms that may control lead bioavailability within the Gl tract. A number of these processes, including the role of passive diffusion, competition with calcium for a common transport mechanism, and the role of organic ligands, are discussed. Geochemical processes that relate to lead bioavailability in the Gl tract are also considered. Galena (PbS) and its alteration product, anglesite (PbSO4), are the primary forms of lead associated with mining wastes. Equilibrium thermodynamics and dissolution kinetics of PbSO4 are modeled because this solid is likely to control the concentration of dissolved lead from many mine wastes in the Gl tract. The geochemical models DIASTAB and MINTEAQ2 are used to calculate theoretical estimates of lead dissolution and a model is proposed to evaluate lead bioavailability by laboratory methods taking into account both kinetic and equilibrium considerations. This type of model requires calibration with animal toxicological studies of lead bioavailability and with epidemiological studies of different types of lead sites. Ultimately, such a geochemical model could be used to evaluate the potential for public health impacts from a particular type of lead in soil." @default.
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• W2569431378 date "1991-12-01" @default.
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• W2569431378 title "The Bioavailability of Lead in Mining Wastes: Physical/Chemical Considerations" @default.
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• W2569431378 doi "https://doi.org/10.1080/09542299.1991.11083165" @default.
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