Leaching Characteristics of Heavy Metals and As from Two Urban Roadside Soils |
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Authors: | Xue Song Wang Yong Qin |
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Institution: | (1) Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu, 222005, China;(2) College of Mineral Resources and Geo-science, China University of Mining and Technology, Xuzhou, Jiangsu, 221008, China |
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Abstract: | The leaching tests, including the Toxicity Characteristic Leaching Procedure (TCLP), EDTA extraction and BCR sequential extractions
before and after EDTA treatments, were performed on two specific soils to elucidate heavy metal-associated mineral fractions
and general leachability. The TCLP illustrated the low leachability of heavy metals in soils from two sites. EDTA is a strong
chelator and therefore had higher extraction efficiency compared to that of TCLP. The lower extraction percentages by EDTA
for As and Sb were found compared to the other heavy metals derived from anthropogenic sources. Sequential extractions showed
that the importance of acid-extractable, organically-bound and Fe–Mn oxide fractions was identified for anthropogenic heavy
metals with the exception of As and Ni while the importance of residual fraction was identified for endogenous metals. Changes
in sequential fractions of heavy metals after leaching with EDTA are very complex and it is difficult to generalize on which
fraction was more mobile than the others. These combined results are helpful in elucidating the association of heavy metals
to soil fractions and the mobility characteristics of heavy metals under certain environmental conditions. |
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Keywords: | Heavy metals EDTA extraction TCLP BCR sequential extraction Metal partitioning |
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