Influence of organic acid and amino acid on cadmium and lead desorption from soil
S. Chen A B C , L. N. Sun A D , L. Chao B C , Q. X. Zhou B and T. H. Sun A BA Key Laboratory of Environment Engineering of Shenyang University, Shenyang 110044, P.R. China.
B Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, P.R. China.
C Graduate School of Chinese Academy of Sciences, Beijing 100039, P.R. China.
D Corresponding author. Email: mailsydx@yahoo.com.cn
Australian Journal of Soil Research 45(7) 554-558 https://doi.org/10.1071/SR07029
Submitted: 26 February 2007 Accepted: 13 September 2007 Published: 12 November 2007
Abstract
A study was conducted to investigate the influence of organic acid (citric acid, oxalic acid) and amino acid (histidine) on the desorption of cadmium and lead from artificial contaminated soil in north-east China. Results showed that when the concentration of organic acid and amino acid in desorption solution was relatively low, the presence of organic ligands inhibited the desorption behaviour of Cd. When organic acid and amino acid concentrations were higher (>2 mmol/L), the presence of organic acid and amino acid obviously promoted Cd desorption. The increment of citric acid, oxalic acid, and histidine concentration significantly (P < 0.01) accelerated the desorption of Pb. The influence of organic acid and amino acid on the desorption behaviour of Cd and Pb followed the same sequence: citric acid > oxalic acid > histidine. This revealed that the organic acids had stronger affinity with heavy metals than that of amino acids. Functional group positions and types were important in determining if an organic acid or an amino acid would complex metals and increase their potential leaching. The results of this work implicated that amendment of organic acid and amino acid would enhance conditionally the bioavailability of heavy metals adsorbed by soils, relying on the type and concentration of organic acid and amino acid in soil solution.
Additional keywords: organic acid, amino acid, cadmium, lead, desorption, soil.
Acknowledgments
This project was financially supported by the Natural Science Foundation of China (approved No. 20477029) and the National key basic research program (973) of China (No. 2004CB418506).
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