title: Extraction of heavy metals from e-waste contaminated soils using EDDS.
abstract: Environmental contamination due to uncontrolled e-waste recycling activities is drawing increasing attention in the world. Extraction of these metals with biodegradable chelant [S,S]-ethylenediaminedisuccinic acid (EDDS) and the factors influencing extraction efficacy were investigated in the present study. Results showed that the addition of EDDS at low pH (5.5) produced higher metal extraction than that at high pH (8.0) solution. Metal speciation analysis indicated that Cu was completely complexed with EDDS at different pH conditions with various amounts of EDDS applied. For Pb and Zn, at low EDDS dose of 0.304 mol/kg soil, they were present as Pb- and Zn-EDDS. However, at high EDDS dose of 1.26 mol/kg soil, most of Pb was bound with dissolved organic matter. Ca and Al were found to be strong competitors for trace metals to EDDS at low application dose and low pH condition.
authors.affiliation: College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China. yangyangzhao33@hotmail.com
authors.forename: Renxiu
authors.initials: R
authors.lastname: Yang
authors.forename: Chunling
authors.initials: C
authors.lastname: Luo
authors.forename: Gan
authors.initials: G
authors.lastname: Zhang
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Li
authors.forename: Zhenguo
authors.initials: Z
authors.lastname: Shen
mesh_terms: D002614:Chelating Agents / Q000737:chemistry; D059029:Electronic Waste / Q000032:analysis*; D005029:Ethylenediamines / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000737:chemistry; D059027:Recycling; D012037:Refuse Disposal / Q000379:methods*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D013386:Succinates / Q000737:chemistry*
chemical_list: C499100:(S,S)-ethylenediaminedisuccinate; D002614:Chelating Agents; D005029:Ethylenediamines; D008670:Metals; D012987:Soil; D012989:Soil Pollutants; D013386:Succinates