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- W2385655496 abstract "Soil washing is one option to remediate heavy metal contaminated soils. The present study examined the removal efficiency of cadmium(Cd)and lead(Pb)from a farmland soil by batch extraction with mixture of organic acid(citric acid or tartaric acid)and Fe Cl3. Metal fractions before and after soil washing were also determined. The Cd and Pb removal efficiency from the soil was up to 40.7% and 20.9% for mixture of citric acid(100 mmol·L-1)and Fe Cl3(20 mmol·L-1), and up to 42.6% and 16.5% for mixture of tartaric acid(100 mmol·L-1)and Fe Cl3(20 mmol·L-1), respectively. The metal removal efficiency was higher for mixed reagents than single reagent. Increasing p H of washing solution decreased the removal efficiency of heavy metals. The optimum washing conditions were liquid to solid ratio of 5 ∶1, washing time of 24 h and washing cycles of 3. Metal fractionation showed that the removed Cd by organic acids combined with Fe Cl3 was mainly from exchangeable(77.3%~79.8% decline)and Fe-Mn oxides forms(86.7%~87.0% reduction), while the organic matter bound metals were almost unchanged. The removed Pb came from Fe-Mn oxides(70.0%~70.8% decrease)and organic matter form(58.8%~66.0% drop). After soil washing, however, the exchangeable Pb significantly increased to 24.2%~24.5%, but Cd and Pb in carbonates almost disappeared with residual metal form unchanged. The removal efficiency of Pb in soil could be significantly increased by repeated washing, and up to 47.0%~48.2% of Pb could be extracted after 3 washing cycles." @default.
- W2385655496 created "2016-06-24" @default.
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- W2385655496 date "2014-01-01" @default.
- W2385655496 modified "2023-09-27" @default.
- W2385655496 title "Remediation of Cadmium and Lead Contaminated Farmland Soil by Washing with Combined Organic Acids and FeCl_3" @default.
- W2385655496 hasPublicationYear "2014" @default.
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