Analysis of Heavy Metals Distribution Characteristics and Pollution Assessment in Agricultural Region Soils of Huaihe Basin
XIAO Xue1, ZHAO Nan-jing1*, YUAN Jing2, MA Ming-jun1, FANG Li1, WANG Yin1, MENG De-shuo1, YU Yang1, TANG Jie2, ZHANG Xiao-ling1, DAI Yuan2, ZHANG Yu-jun1, LIU Jian-guo1, LIU Wen-qing1
1. Key Laboratory of Environment Optics and Technology, Chinese Academy of Sciences; Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 2. Yangzhou Environmental Monitoring Centre Station, Yangzhou 225007, China
Abstract：By means of field sampling and laboratory analysis, the content distribution characteristics of Cd, Cr, Cu, Ni, Pb and Zn in agricultural region soils of Huaihe basin in Anhui province were analyzed. Assessment of heavy metal pollutions was conducted using enrichment factor, geoaccumulation index and potential ecological risk index. The results showed that the average mass fraction of Cd and Cu was 0.113 5 and 22.09 mg·kg-1 respectively in the study area soil, which were above the background values 0.097 and 20.4 mg·kg-1 in Anhui Province. The average mass fraction of other four heavy metals did not exceed the average values of Anhui Province. The results of the evaluations from geoaccumulation index and ecological risk assessment discovered that Cd is the strongest pollution metal among six heavy metals in the study area soil. For some samples of the study soil, Cd was slight risk for the ecosystem. The ecosystem risks caused by the other five heavy metals were not obviously for the sampling points. The entire study area soils were mid integrated potential ecological risk.
Key words：Heavy metal;Soil;Enrichment factor;Geoaccumulation index;Potential ecological risk index
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