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重金属污染土壤的草酸和EDTA混合淋洗研究

Keywords: 重金属,污染土壤,草酸,EDTA,混合淋洗

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Abstract:

采用不同浓度的草酸(oxalicacid,OX)和乙二胺四乙酸(EDTA)混合的淋洗方法研究重金属污染土壤的最佳混合淋洗方式,探讨了液固比、淋洗时间及pH对淋洗效果的影响,并分析了0.2mol/LOX+0.2mol/LEDTA处理前后土壤中重金属形态的变化。结果表明,采用0.2mol/LOX+0.2mol/LEDTA混合的淋洗法可同时去除多种重金属,且对Cu、Zn、Ni和Cr的去除率明显高于单用OX和EDTA,去除率分别为Cu41.29%、Zn84.73%、Ni54.2%和Cr66.01%。0.2mol/LOX+0.2mol/LEDTA在液固比为5:1、淋洗时间为4h、pH为6时可分别达到最佳淋洗效果,且分别为Cu62.59%、Zn93.48%、Ni55.95%和Cr71.57%;Cu50.47%、Zn86.67%、Ni61.53%和Cr72.68%;Cu44.40%、Zn81.82%、Ni68.76%和Cr74.93%。形态分析结果表明,0.2mol/LOX+0.2mol/LEDTA能较好地改变土壤中重金属形态的分布。

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