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Title: Speciation and leaching of trace metal contaminants from e-waste contaminated soils
Authors: Cui, JL
Luo, CL
Tang, CWY
Chan, TS
Li, XD
Keywords: E-waste contaminated soil
Speciation and mobilization
Trace metal
Issue Date: 2017
Publisher: Elsevier
Source: Journal of hazardous materials, 2017, v. 329, p. 150-158 How to cite?
Journal: Journal of hazardous materials 
Abstract: Primitive electrical and electronic waste (e-waste) recycling activities have caused serious environmental problems. However, little is known about the speciation and leaching behaviors of metal contaminants at e-waste contaminated sites. This study investigated trace metal speciation/mobilization from e-waste polluted soil through column leaching experiments involving irrigation with rainwater for almost 2.5 years. Over the experimental period, Cu and Zn levels in the porewater were 0.14 ± 0.08 mg/L, and 0.16 ± 0.08 mg/L, respectively, increasing to 0.33 ± 0.16 mg/L, and 0.69 ± 0.28 mg/L with plant growth. The amounts of Cu, Zn, and Pb released in surface soil (0–2 cm) contributed 43.8%, 22.5%, and 13.8%, respectively, to the original levels. The released Cu and Zn were primarily caused by the mobilization of the carbonate species of metals, including Cu(OH)2, CuCO3, and Zn5(CO3)2(OH)6, and amorphous Fe/Mn oxides associated fractions characterized by sequential extraction coupling with X-ray absorption spectroscopy. During the experiments, trace metals were not detected in the effluent, and the re-sequestration of trace metals was mainly attributed to the adsorption on the abundant Fe/Mn oxides in the sub-layer soil. This study quantitatively elucidated the molecular speciation of Cu and Zn in e-waste contaminated soil during the column leaching process.
ISSN: 0304-3894
EISSN: 1873-3336
DOI: 10.1016/j.jhazmat.2016.12.060
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