Mineralogic constraints on the bioavailability of arsenic in smelter-impacted soils

Article Abstract:

The toxicity of arsenic in drinking water is the primary basis for Superfund risk assessments and the resulting soil As cleanup levels selected for mining sites. Anaconda soils and house dusts contain less soluble smelter-related arsenic phases, mainly in the form of metal-arsenic oxides and phosphates. It is shown that arsenic bioaccessibility is limited by the soluble nature of arsenic-bearing phases, the prevalence of authigenic carbonate and silicate rinds, the kinetic hindrance to dissolution and the inaccessible nature of encapsulated arsenic.

Soils, Arsenic, Smelting

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Lead bioavailability: dissolution kinetics under simulated gastric conditions

Article Abstract:

The bioavailability of lead from mining sites is lower than lead ingested in urban settings. The dissolution kinetics of mine-waste-contaminated soil and pure anglesite (PbSO4) were tested in vitro in a simulated gastrointestinal tract. Less lead from the mine waste was readily soluble than in the urban soil, so less was absorbed during the 2 hours passage through the gastric system. Lead dissolution from the PbSO4 solution was best described by a first-order kinetic equation, while a parabolic diffusion equation best fit the mine test soil.

Soil pollution, Mineral deposits, Bioavailability, Mines and mineral resources, Mining

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Micromineralogy of mine wastes in relation to lead bioavailability, Butte, Montana

Article Abstract:

A study of mine waste, Butte, Montana assists explanation of low blood lead (Pb) levels in children from the area. Ingestion of soil containing lead has been regarded as a possible source of raised blood Pb levels in young children. Mineralogical analysis contributed to risk assessment in mining communities. Investigation established oxidised Pb minerals predominate in Butte minewaste. Alteration of galena to anglesite decreased solubility. Results indicated Pb blood levels of children bear no relation to soil Pb concentration in Butte.

Lead, Mine soils

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