Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 174, Issue 1-3, Pages 59-63Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.09.016
Keywords
Soil washing; Copper; Ethylenediaminedisuccinic acid (EDDS); Ethyl lactate; Remediation
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Funding
- National Natural Science Foundation of China [20407012]
- National Natural Science Foundation of Jiangsu Province [BK2007523]
- National High Technology Research and Development Program (863 Program) of China [2007AA06Z307]
- National Science Foundation [40725010]
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A new approach using aqueous ethyl lactate-modified [S,S]-ethylenediaminedisuccinic acid (EDDS) washing solutions for the removal of Cu from field-contaminated soils was examined in the laboratory. At pH 7 the maximum extraction efficiencies of Cu were about 41% by EDDS solution (EDDS:Cu molar ratio = 8), and < 2% by ethyl lactate solution. However, greater extraction efficiencies of up to 50% were achieved by amending the EDDS solution with ethyl lactate (EDDS:Cu molar ratio = 2, ethyl lactate:Cu molar ratio = 25). The pH of the extraction solution did not have a significant effect on the extraction of Cu. The washing agent could also be regenerated quite effectively for economy of use. Sequential extraction results showed that the two most bioavailable Cu fractions, i.e., the acid extractable and reducible fractions, were significantly reduced. The mechanism responsible for the enhanced extraction efficiency in the presence of ethyl lactate is the increased the stability constant of Cu-EDDS complexes in the presence of ethyl lactate, which enhanced desorption of Cu from soil. (C) 2009 Elsevier B.V. All rights reserved.
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