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Journal of Zhejiang University SCIENCE A 2007 Vol.8 No.11 P.1808-1815


Competitive adsorption of Cd, Cu, Hg and Pb by agricultural soils of the Changjiang and Zhujiang deltas in China

Author(s):  ZHANG Ming-kui, ZHENG Shun-an

Affiliation(s):  Department of Natural Resource Sciences, School of Natural Resource and Environmental Sciences, Zhejiang University, Hangzhou 310029, China

Corresponding email(s):   mkzhang@zju.edu.cn

Key Words:  Competitive adsorption, Adsorption sequence, Heavy metals, Agricultural soils

ZHANG Ming-kui, ZHENG Shun-an. Competitive adsorption of Cd, Cu, Hg and Pb by agricultural soils of the Changjiang and Zhujiang deltas in China[J]. Journal of Zhejiang University Science A, 2007, 8(11): 1808-1815.

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author="ZHANG Ming-kui, ZHENG Shun-an",
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publisher="Zhejiang University Press & Springer",

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%T Competitive adsorption of Cd, Cu, Hg and Pb by agricultural soils of the Changjiang and Zhujiang deltas in China
%A ZHANG Ming-kui
%A ZHENG Shun-an
%J Journal of Zhejiang University SCIENCE A
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%D 2007
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2007.A1808

T1 - Competitive adsorption of Cd, Cu, Hg and Pb by agricultural soils of the Changjiang and Zhujiang deltas in China
A1 - ZHANG Ming-kui
A1 - ZHENG Shun-an
J0 - Journal of Zhejiang University Science A
VL - 8
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SP - 1808
EP - 1815
%@ 1673-565X
Y1 - 2007
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2007.A1808

Soils can often be contaminated simultaneously by more than one heavy metal. The sorption-desorption behavior of a metal in a soil will be affected by the presence of other metals. Therefore, selective retention and competitive adsorption of the soils to heavy metals can affect their availability and movement through the soils. In this study, the simultaneous competitive adsorption of four heavy metals (Cd, Cu, Hg, and Pb) on ten agricultural soils collected from the Changjiang and Zhujiang deltas, China was assessed. The results showed that the competition affected the behavior of heavy metal cations in such a way that the soils adsorbed less Cd and Hg, and more Pb and Cu with increasing total metal concentrations, regardless of the molar concentration applied. As the applied concentrations increased, Pb and Cu adsorption increased, while Cd and Hg adsorption decreased. The adsorption sequence most found was Pb>Cu>Hg>Cd. The maximum adsorption capacity for the heavy metal cations was calculated, and affected markedly by soil properties. The results suggest that Hg and Cd have higher mobility associated to the lower adsorption and that Pb and Cu present the opposite behavior. Significant correlations were found between the maximum adsorption capacity of the metals and pH value and exchangeable acid, suggesting that soil pH and exchangeable acid were key factors controlling the solubility and mobility of the metals in the agricultural soils.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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