Environmental Science Research Institute, College of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Environ Pollut. 2013 Mar;174:93-9. doi: 10.1016/j.envpol.2012.11.015. Epub 2012 Dec 17.
This study investigated the simultaneous desorption of trace metal elements and polychlorinated biphenyl (PCB) from mixed contaminated soil with a novel combination of biosurfactant saponin and biodegradable chelant S,S-ethylenediaminedisuccinic acid (EDDS). Results showed significant promotion and synergy on Pb, Cu and PCB desorption with the mixed solution of saponin and EDDS. The maximal desorption of Pb, Cu and PCB were achieved 99.8%, 85.7% and 45.7%, respectively, by addition of 10 mM EDDS and 3000 mg L(-1) saponin. The marked interaction between EDDS and saponin contributed to the synergy performance. The sorption of EDDS and saponin on soil was inhibited by each other. EDDS could enhance the complexation of metals with the saponin micelles and the solubilization capabilities of saponin micelles for PCB. Our study suggests the combination of saponin and EDDS would be a promising alternative for remediation of co-contaminated soils caused by hydrophobic organic compounds (HOCs) and metals.
本研究采用新型生物表面活性剂皂素与可生物降解螯合剂 S,S-乙二胺二琥珀酸（EDDS）的组合，同时从混合污染土壤中解吸痕量金属元素和多氯联苯（PCB）。结果表明，皂素和 EDDS 的混合溶液对 Pb、Cu 和 PCB 的解吸有显著的促进和协同作用。通过添加 10 mM EDDS 和 3000 mg/L 皂素，Pb、Cu 和 PCB 的最大解吸率分别达到 99.8%、85.7%和 45.7%。EDDS 和皂素之间的显著相互作用导致了协同性能。EDDS 和皂素在土壤上的吸附相互抑制。EDDS 可以增强金属与皂素胶束的络合作用以及皂素胶束对 PCB 的溶解能力。我们的研究表明，皂素和 EDDS 的组合将是修复由疏水性有机化合物（HOCs）和金属引起的复合污染土壤的一种很有前途的替代方法。
