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Environmental Monitoring and Assessment

, Volume 132, Issue 1–3, pp 83–92 | Cite as

Leaching Characteristics of Heavy Metals and As from Two Urban Roadside Soils

  • Xue Song Wang
  • Yong Qin
Article

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.

Keywords

Heavy metals EDTA extraction TCLP BCR sequential extraction Metal partitioning 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Department of Chemical EngineeringHuaihai Institute of TechnologyLianyungang, JiangsuChina
  2. 2.College of Mineral Resources and Geo-scienceChina University of Mining and TechnologyXuzhou, JiangsuChina

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