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| Heavy metal pollution and potential ecological risk assessment in farmland soils located in Xiangtan County in Hunan Province,China |
| Received:November 29, 2018 |
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| KeyWord:Xiangtan County;farmland soil;heavy metals;pollution characteristics;ecological risk |
| Author Name | Affiliation | E-mail | | LIU Rui-xue | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | QIAO Dong-yun | Agricultural Environmental Protection and Rural Energy Management Station in Jilin Province, Changchun 130021, China | | | WANG Ping | Agricultural Resources and Environmental Management Station in Guizhou Province, Guiyang 550001, China | | | AN Yi | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUO Li-li | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | huoliliforgood@163.com |
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| Abstract: |
| To characterize the pollution and potential ecological risk from heavy metals in soil of farmland in Xiangtan County, eight heavy metals(As, Hg, Zn, Pb, Cu, Cr, Cd, and Ni)were analyzed and evaluated, using the Potential Ecological Hazard Index. Based on the Soil Environmental Quality Risk Control Standards for Soil Contamination of Agricultural Land(GB 15618-2018), we found that only Cd concentration(mean value)exceeded the risk screening value(RSV)among all the soil heavy metals in the study region. Cd and Hg showed high accumulation, and the minimum Cd and Hg concentration was 1.53 times and 1.04 times that of the local background values, respectively. With regards to single index evaluations, the proportion of samples with concentrations of Cr, As, Hg and Pb lower than the RSV was more than 90%. In most samples, Cd concentration was higher than RSV. The high Cd concentration occured in the eastern region. No samples with heavy metals concentrations higher than the risk intervention value(RIV)were found. The results of this comprehensive evaluation indicate that 92% of the samples may have soil pollution risks, and edible agricultural products may not be meeting quality and safety standards. The soil pollution in this county should be attributed to Cd pollution. Furthermore, the average of the potential ecological risk factor is 314.9 in this area, which indicates a high level of potential risk, mainly due to the high levels of Cd contamination. |
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