Estimation of Lead Releasing Characteristics in Contaminated Agricultural Soils by Chelating Agents

Abstract:

Lead (Pb) is a highly toxic element because of its accumulative and persistent character in the environment. Especially, the risks of their potential entry into the food chain and pollution of heavy metal in an agricultural system will threaten to human health. Songsan wastewater irrigation region, a big rice production area of Anshan, Liaoning province, was polluted by containments of heavy metals for more than 80 years. The total Pb concentration in polluted soil sample was higher than in natural soil (value of environmental standard ≤35 mg•kg-1). In the study, the two chelating agents (EDTA and DTPA) were used to release Pb from the polluted soil. On the basis of single extraction procedures of Pb with two extracting agents, we found that EDTA had a significantly higher chelating capacity than DTPA (P<0.05). In addition, among our researches on releasing kinetics of lead with two reagents, the results indicated that the equilibrium action time was about 16 h.

• Periodical: Advanced Materials Research (Volume 664)
• Pages: 106-110
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.664.106
• Online since: February 2013
• Authors: Cheng Bin Xu, Yao Yao Li, Xue Kai Sun, Jie Bai
• Keywords: Chelating Agent, Heavy Metal, Lead, Soil Remediation

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