为了探讨茶皂素淋洗修复土壤重金属污染的可行性,该文采用振荡提取和土柱淋洗的方法,研究了茶皂素对污染土壤中重金属的去除作用.结果表明,茶皂素溶液的浓度和土壤的pH值对重金属去除率有明显影响.土柱淋洗试验中,采用质量分数7%茶皂素溶液作淋洗液,pH 5.0±0.1、土液质量体积比1:4为最佳淋洗修复条件,此时,Pb、Cd、Zn、Cu的去除率分别为6.74%、42.38%、13.07%、8.75%,去除率的大小顺序为Cd＞Zn＞Cu＞Pb.茶皂素淋洗能有效去除酸溶态和可还原态的重金属,从而大大降低了重金属的环境风险,同时说明茶皂素用于土壤重金属污染淋洗修复有较大潜力.%For the purpose of investigating the possibility of tea-saponin on leaching remediation of heavy metal contaminated soil, the effect of tea-saponin on the removal of heavy metals from contaminated soil were analyzed by oscillation and soil leaching methods. The results showed that the concentrations of tea-saponin and the soil pH value had obvious effects on the removal efficiency of heavy metals. In the soil leaching experiment, 7% tea-saponin solution was used as flushing agents, the optimum conditions were as follows: pH value was 5.0±0.1, the ratio of soil to solution was 1:4. Then the removal efficiency could reach 6.74%, 42.38%, 13.07% and 8.75% for Pb, Cd, Zn and Cu, respectively. The removal efficiency of heavy metals was in a sequence of Cd>Zn>Cu>Pb. After soil leaching by tea-saponin, heavy metals in acid-soluble fraction and oxide fraction were effectively removed, and the environment risk of heavy metals was decreased. It also shows that tea-saponin has great potentiality in leaching remediation of heavy metal contaminated soil.
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