title: Enhanced desorption of PCB and trace metal elements (Pb and Cu) from contaminated soils by saponin and EDDS mixed solution.
abstract: 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.
authors.affiliation: Environmental Science Research Institute, College of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
authors.forename: Menghua
authors.initials: M
authors.lastname: Cao
authors.forename: Yuan
authors.initials: Y
authors.lastname: Hu
authors.forename: Qian
authors.initials: Q
authors.lastname: Sun
authors.forename: Linling
authors.initials: L
authors.lastname: Wang
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Lu
mesh_terms: D052918:Environmental Restoration and Remediation / Q000379:methods*; D005029:Ethylenediamines / Q000737:chemistry*; D008670:Metals / Q000032:analysis / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D013386:Succinates / Q000737:chemistry*
chemical_list: D005029:Ethylenediamines; D008670:Metals; D012503:Saponins; D012987:Soil; D012989:Soil Pollutants; D013386:Succinates; C041447:N,N'-ethylenediamine disuccinic acid; D011078:Polychlorinated Biphenyls