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- W2337322533 abstract "Weak organic acids have the capabilities ofwashing heavy metals without seriously deteriorating the soil properties. A clay loam naturally contaminated by heavy metals was characterized physically and analyzed for its content in Cr, Hg, Mn, and Pb. At various pH, concentration, and reaction time, several weak organic acids and their salts were used to leach out heavy metals. The optimum pH ranged from 5 to 7 for citrate and 2 to 3 for tartarate in the case of Cr, Hg, and Mn and 2 to 7 in the case ofPb. More than 85% ofPb was removed with both citrate and tartarate at a concentration of 0.12 and 0.2 M, respectively, within 24 h. From 86 to 99% ofHg was removed by tartarate and citrate, whereas up to 60% ofCr was removed. EDTA and DTPA were found to be quite effective in removing Pb but not the other metals. Four citrate or tartarate extractions were required to remediate the experimental soil to a category A except for Hg. For Hg, remediation criteria are so strict that only the C criteria were met after two extractions, with citrate and tartarate, that left levels of32 and 62 mglkg, respectively, when a category A soil requires no more than 0.5 mglkg." @default.
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- W2337322533 date "1998-01-01" @default.
- W2337322533 modified "2023-09-23" @default.
- W2337322533 title "Organic acids to remediate a clay loam polluted by heavy metals" @default.
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