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首页> 外文期刊>Journal of Environmental Engineering >Chelating-agent-enhanced heavy metal extraction from a contaminated acidic soil
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Chelating-agent-enhanced heavy metal extraction from a contaminated acidic soil

机译：从污染的酸性土壤中萃取螯合剂增强重金属

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摘要

An acidic soil was deliberately contaminated with lead (Pb), cadmium (Cd), and chromium (Cr). The heavy metal speciation in the aged soil sample was analyzed using a sequential extraction procedure. A single-step extraction procedure was then employed to remove the heavy metals from the soil using sodium ethylenediaminetetraacetic acid, sodium nitrilotriacetic acid, and calcium trisodium diethylenetriaminepentaacetic acid. The extraction parameters were the type and concentration of chelating agent and the duration, of extraction time. All the extractions that involved chelating agents were carried out at pH 7.0. The heavy metal extraction efficiencies of chelating agents were compared to those of HNO3, CaCl2, and deionized water. The extraction results showed that the chelating agents were more efficient in extracting Pb and Cd from the acidic soil than HNO3. The extractable Pb and Cd were removed from the soil within 15 min of extraction time with the chelating agents. However, the chelating agents demonstrated a poor Cr extraction. The extraction efficiency seemed to be dependent on the heavy metal speciation in the solid phase. The extraction with a low chelating agent: metal molar ratio and short extraction time was proven to be optimal for Pb and Cd extractions. In contrast, an effective Cr extraction would require a high dosage of chelating agent and a long extraction time.
机译：酸性土壤被铅（Pb），镉（Cd）和铬（Cr）故意污染。使用顺序提取程序分析了老化土壤样品中的重金属形态。然后采用一步提取程序，使用乙二胺四乙酸钠，次氮基三乙酸钠和二亚乙基三乙胺五乙酸三钠钙从土壤中去除重金属。提取参数为螯合剂的类型和浓度以及提取时间的长短。所有涉及螯合剂的提取均在pH 7.0下进行。比较了螯合剂与HNO3，CaCl2和去离子水的重金属萃取效率。萃取结果表明，螯合剂比HNO3更有效地从酸性土壤中萃取铅和镉。在15分钟内用螯合剂将可提取的Pb和Cd从土壤中去除。然而，螯合剂显示出差的Cr提取。萃取效率似乎取决于固相中的重金属形态。事实证明，采用低螯合剂：金属摩尔比和较短的萃取时间进行萃取对于Pb和Cd萃取是最佳的。相反，有效的Cr萃取将需要高剂量的螯合剂和较长的萃取时间。

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