CAJ | 학술논문

以重金属Zn、Pb、Cu复合污染土壤为对象，采用淋洗方法，研究了柠檬酸与皂素对人工污染土壤的联合淋洗修复效果。结果表明，40 mmol·L-1的柠檬酸与质量分数为3%的皂素在体积比为1：5的情况下对重金属Zn、Pb淋洗的累计去除效率较高，分别为67.2%，68.8%；在体积比为1：1时对Cu的累积去除率较高，为37.7%，不及单独用柠檬酸淋洗的效果好。柠檬酸与皂素对土壤中重金属淋洗的联合效应与二者的体积比和重金属种类有关，两者的联合淋洗可去除Zn的96%酸溶态、38.9%可氧化态，淋洗后可还原态显著增加；Pb酸溶态、可还原态均减少了80%左右；Cu的酸溶态、可还原态减少了80%以上，可氧化态和残渣态则没有显著性变化。
이중금속Zn、Pb、Cu복합오염토양위대상，채용림세방법，연구료저몽산여조소대인공오염토양적연합림세수복효과。결과표명，40 mmol·L-1적저몽산여질량분수위3%적조소재체적비위1：5적정황하대중금속Zn、Pb림세적루계거제효솔교고，분별위67.2%，68.8%；재체적비위1：1시대Cu적루적거제솔교고，위37.7%，불급단독용저몽산림세적효과호。저몽산여조소대토양중중금속림세적연합효응여이자적체적비화중금속충류유관，량자적연합림세가거제Zn적96%산용태、38.9%가양화태，림세후가환원태현저증가；Pb산용태、가환원태균감소료80%좌우；Cu적산용태、가환원태감소료80%이상，가양화태화잔사태칙몰유현저성변화。
Soil contamination with heavy metals has become an increasingly severe global environmental issue. Considerable efforts have been made to remediate contaminated soils. In this study, Zn, Pb and Cu spiked soil was employed to evaluate leaching of metals from the soil with citric acid and saponin. First, optimal concentration of citric acid or saponin was determined in mono-leaching experiments with single citric acid or saponin. Second, removal rates of heavy metals were examined by co-leaching of citric acid and saponin at their optimal concentrations. Finally, chemical species of heavy metals in soils after co-leaching were analyzed using BCR procedure. The optimal con-centration of citric acid was 40 mmol·L-1 and saponin 3%. The removal rates of Zn and Pb were greatest at 1:5 volume ratio of citric acid to saponin solution, being 67.2%and 68.8%, respectively. However, the greatest removal rate of Cu was 37.7%, at 1:1 volume ratio of citric acid to saponin, less than that of citric acid alone. Compared to the control, combined leaching removed 96%of acid soluble, 38.9%of oxi-dizable and 51.5%of residual Zn, but increased reducible Zn significantly. Leaching reduced both acid soluble and reducible Pb and Cu by 80%. Oxidizable and residue Cu did not change significantly after leaching.