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• W4308957547 endingPage "160149" @default.
• W4308957547 startingPage "160149" @default.
• W4308957547 abstract "Compare to the content of Cr(VI), the distribution of specific Cr(VI) species in soil is rarely paid attention to, which may lead to an inaccurate environmental risk assessment of Cr(VI) contaminated soil or inability to meet stringent requirement for soil remediation. Herein, to reveal the primary mechanisms and factors controlling the evolution of Cr(VI) species in soil, the distribution of Cr(VI) and Cr(III) species in soils with different particle sizes and textures was systematically investigated by using a modified sequential extraction procedure and spectroscopy characterizations (e.g., SEM-EDS mapping). The results show that a significant proportion of Cr(VI) can be captured by minerals containing exchangeable calcium ions and metal oxide hydrates in the soil, forming a relatively stable adsorbed Cr(VI). Also, a small fraction of Cr(VI) can precipitate as calcium chromate with free calcium ion which is the most stable Cr(VI) species in the soil. The majority of Cr(VI) discharged into soil tends to be reduced by ferrous ions or minerals containing ferrous ions with a product of Fe(III)-Cr(III) coprecipitate. Therefore, the speciation of Cr in the soil is closely correlated to Fe and Ca. After the equilibrium of adsorption, precipitation, and reduction reactions of Cr(VI), the rest of Cr(VI) retains as the form of its original water-soluble state in soil. The evolution of Cr(VI) species and the content of specific Cr species in soil are mainly determined by the contents of iron, exchangeable calcium ions and metal oxide hydrates, which effect the Cr(VI) reduction, precipitation and adsorption, respectively." @default.
• W4308957547 created "2022-11-20" @default.
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• W4308957547 date "2023-02-01" @default.
• W4308957547 modified "2023-10-03" @default.
• W4308957547 title "Insights into the evolution of Cr(VI) species in long-term hexavalent chromium contaminated soil" @default.
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• W4308957547 doi "https://doi.org/10.1016/j.scitotenv.2022.160149" @default.
• W4308957547 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36372161" @default.
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