Chemical Fractionation and Bioavailability of Cd, Ni, Cu, Zn and Pb in Sewage-Irrigated Soils from Xiaoqing River, Zhangqiu Area, China

Abstract:

The total contents and chemical phase partitioning of Cd, Ni, Cu, Zn and Pb from long-time sewage- irrigated soil were analyzed in this paper. The results showed that the contents of Ni, Cu, Zn, and Pb did not exceed the the second-level limit of Standard of Soil Environment (GB15618-1995), but the average content of Cd was 1.81 mg•kg^-1, which was about three times more than the national standard. The chemical partitioning of metals analysis showed that Cd was present dominantly in the acetic acid extractable fraction with the average percentage of 37.44%, while the other four elements mostly in residual fraction, which indicated that Cd had the highest bioavailability, mobility and phyto-toxicity. Compared to the well-irrigated soils, the percentages of acetic acid extractable fractions of Cd, Ni, Zn and Cu were obviously higher in the contaminated soils, which increased the potential danger of heavy metals pollution.

• Periodical: Advanced Materials Research (Volumes 356-360)
• Pages: 891-895
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.356-360.891
• Online since: October 2011
• Authors: Su Ping Feng, Xiao Lin Du, Yong Li Liu, Nan Nan Zhang, Hai Lin
• Keywords: Bioavailability, Chemical Fractionation, Heavy Metal, Sewage Irrigation

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