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Improved geochemical modeling of lead solubility in contaminated soils by considering colloidal fractions and solid phase EXAFS speciation
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2018 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 92, p. 110-120Article in journal (Refereed) Published
Abstract [en]

Lead (Pb) is a common contaminant in soils at e.g. mining, shooting range, and glassworks sites. In order to make reliable risk assessments and appropriate decisions on various "gentle remediation options", such as applying phosphate, compost, or zero-valent iron to soils, the binding mechanism of Pb and its speciation needs to be known. Multi-surface geochemical equilibrium models are useful tools for estimating trace metal solubility and speciation, but for Pb the predictions are often poor. This study evaluates the recent parameterization for Pb in the Visual MINTEQ code for its ability to predict the solubility of Pb at different pH values in four historically contaminated Swedish soils. As an independent validation of the model performance, the modeled solid-phase speciation was compared to measured Pb speciation retrieved using extended X-ray absorption fine structure (EXAFS) spectroscopy.

Place, publisher, year, edition, pages
2018. Vol. 92, p. 110-120
Keywords [en]
Soil, Lead, Metal, Geochemistry, pH, X-ray, Absorption, Solubility, Speciation, Sweden, Bibliography, English
National Category
Geotechnical Engineering Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:swedgeo:diva-767DOI: 10.1016/j.apgeochem.2018.01.014OAI: oai:DiVA.org:swedgeo-767DiVA, id: diva2:1339356
Available from: 2019-07-29 Created: 2019-07-29 Last updated: 2019-07-29

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