Title: Distribution Characteristics and Ecological Risk Assessment of Soil Heavy Metals in Bojianghaizi Basin
Abstract: 54 soil samples were taken from the Bojianghaizi Basin to analyze the concentration of As, Cd, Cr, Hg, Ni, Pb and Zn, and to obtain the spatial distribution characteristics, soil quality and potential ecological risk assessment by Arc GIS10.1, single factor pollution index, comprehensive pollution index and Hakanson potential ecological risk indices. The results showed that the average metal concentrations were in the order of Zn(79.60 mg / kg), Cr(56.40 mg / kg, Ni(12.89 mg / kg), As(12.48 mg / kg), Cu(8.34 mg / kg), Pb(6.60 mg / kg), Hg(0.03 mg / kg). All of them reached the national soil environmental quality standards(GB 15618-1995). The average concentration of Zn, Cr and Pb were higher than background value of Inner Mongolia area. Their variation coefficients were comparatively high. The single factor index was in decreasing order of As,Zn,Cr,Ni,Cu,Hg,Pb,Hg.The average Nemerow index of soil was 0.95, indicating that the soil was clean. Compared with the national standard, about one-third of the soil suffered from different levels of heavy metal contamination. Zn was the key factor, and closely related with the soil quality. The average potential ecological risk was 85.98, indicating that this soil was under slightly ecological hazard. Hg and As were the main contributors of the ecological risk.
Publication Year: 2015
Publication Date: 2015-01-01
Language: en
Type: article
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