无患子提取物促进柠檬酸-EDTA修复铜、铅污染土壤
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摘要
为了探讨天然无患子提取物对柠檬酸-EDTA复合淋洗剂萃取高原红壤中重金属Cu、Pb的促进作用,采用恒温振荡提取的方法,研究无患子提取物对高原红壤中Cu、Pb的萃取促进作用。结果表明,无患子提取物的浓度对重金属去除率有明显影响。在萃取试验中,以0.013 mol/L EDTA、0.2 mol/L柠檬酸作为复合淋洗剂,在振荡时间为2 h、液固比值为10 m L/g的最佳淋洗修复条件下,加入无患子提取物具有明显的萃取促进作用。当无患子提取物浓度达到2.5%时, Cu、Pb去除率均能提高9%。此时Cu、Pb的去除率分别为77.70%和67.75%,无患子促进淋洗能有效去除Cu、Pb重金属在土壤中的酸溶态和可还原态,从而大大降低重金属的环境风险,同时说明利用天然表面活性剂可达到增效去除土壤中Cu、Pb重金属的作用。
To explore the promotion of the natural extracts of sapindus for acid unite EDTA compound leaching extracting Cu and Pb in plateau red soil, the method of oscillation extraction to study the effect of sapindus extraction to extracting of Cu and Pb in red soil was used. The result showed that the concentration of soapberry extraction had obvious effects on the removal rate of heavy metals. In the extraction experiments, with 0.013 mol/L EDTA and 0.2 mol/L citric acid as the compound leaching reagent, the best washing remediation conditions were oscillation time 2 h, and the ratio of liquid to solid 10 mL/g. Adding the soapberry extract could significantly promote the extraction. When sapindus extract concentration reached 2.5%, the removal rate of Cu and Pb could improve 9%, and the removal rates of Cu and Pb were 77.7% and 67.75%. Sapindus leaching could effectively promote removal the acid soluble and reducible of Cu and Pb, greatly reducing the risk of heavy metals in the environment. Meanwhile, it showed that natural surfactants could achieve synergistic effect of the removal of heavy metals.
To explore the promotion of the natural extracts of sapindus for acid unite EDTA compound leaching extracting Cu and Pb in plateau red soil, the method of oscillation extraction to study the effect of sapindus extraction to extracting of Cu and Pb in red soil was used. The result showed that the concentration of soapberry extraction had obvious effects on the removal rate of heavy metals. In the extraction experiments, with 0.013 mol/L EDTA and 0.2 mol/L citric acid as the compound leaching reagent, the best washing remediation conditions were oscillation time 2 h, and the ratio of liquid to solid 10 mL/g. Adding the soapberry extract could significantly promote the extraction. When sapindus extract concentration reached 2.5%, the removal rate of Cu and Pb could improve 9%, and the removal rates of Cu and Pb were 77.7% and 67.75%. Sapindus leaching could effectively promote removal the acid soluble and reducible of Cu and Pb, greatly reducing the risk of heavy metals in the environment. Meanwhile, it showed that natural surfactants could achieve synergistic effect of the removal of heavy metals.
引文
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[4]黄益宗,郝晓伟,雷鸣,等.重金属污染土壤修复技术及其修复实践[J].农业环境科学学报,2013(3):25-31.
[5]LI R,ZHOU Y,YANG Y C.Tandem mass spectrometry analysis of saponins from Sapindus mukurossi[J].Chemical JChin Univ,2006(27):52-54.
[6]WANG X C.Analysis of surface-active substances in Sapindus mukurossi by high performance liquid chromatographymass spectrometry[J].Chin J Chromatography,2001(19):529-631.
[7]陈晓婷,王欣,陈新.几种螯合剂对污染土壤的重金属提取效率的研究[J].江苏环境科技,2005,18(2):9-13.
[8]蒋煜峰,展惠英,袁建梅,等.表面活性剂强化EDTA络合洗脱污灌土壤中重金属的试验研究[J].农业环境科学学报,2006,25(1):119-123.
[9]宋丹丹,梁生康,王江涛.槐糖脂生物表面活性剂的结构特征及理化性质初探[J].环境化学,2011(8):119-125.
[10]马满英,施周,刘有势.生物表面活性剂修复HOCS污染土壤的研究进展[J].生态学杂志,2008,27(5):835-840.
[11]卢宁川,郁建桥,杨芳.皂角苷对土壤中重金属的解吸过程及机制[J].安徽农学通报(上半月刊),2010(9):18-21.
[12]王学浩.无患子皂苷增强洗脱污染土壤中PAHs及表面活性剂淋洗液回收处理的研究[D].杭州:浙江大学,2013.
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[14]刘恩峰,沈吉,朱育新.重金属元素BCR提取法及在太湖沉积物研究中的应用[J].环境科学研究,2005,18(2):57-60
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[16]李光德,张中文,敬佩.茶皂素对潮土重金属污染的淋洗修复作用[J].农业工程学报,2009,25(10):231-235.