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| Pollution characteristics and risk assessment of heavy metals in surface sediments of the upper Hanjiang River, China |
| Received:February 10, 2020 |
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| KeyWord:sediment;heavy metal;pollution assessment;the upper Hanjiang River |
| Author Name | Affiliation | | SONG Feng-min | School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China
Collaborative Innovation Center for Bioresource Comprehensive Development in the Qinling-Bashan Area, Hanzhong 723001, China | | YUE Xiao-li | School of Public Art, Sichuan Fine Arts Institute, Chongqing 401331, China | | LIU Zhi-feng | School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China
Collaborative Innovation Center for Bioresource Comprehensive Development in the Qinling-Bashan Area, Hanzhong 723001, China | | GE Hong-guang | School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China
Collaborative Innovation Center for Bioresource Comprehensive Development in the Qinling-Bashan Area, Hanzhong 723001, China | | LI Chen | School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China
Collaborative Innovation Center for Bioresource Comprehensive Development in the Qinling-Bashan Area, Hanzhong 723001, China | | ZHAO Zuo-ping | School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China
Collaborative Innovation Center for Bioresource Comprehensive Development in the Qinling-Bashan Area, Hanzhong 723001, China |
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| Abstract: |
| In order to investigate the pollution characteristics and sources of heavy metals, the concentrations and spatial variation characteristics of Cd, Pb, Cu, Zn, As, Cr, and Ni from 33 surface sediment samples of the upper Hanjiang River were discussed. Meanwhile, the potential ecological risks were evaluated using the geo-accumulation index(Igeo)and pollution load index(PLI). The results showed in the surface sediments Cd pollution was the most serious, with 15 sample points which were exceeded the risk screening values of heavy metals in soil,accounting for 45.45% of the total samples,while there were no sample points which exceeded the risk screening values for Pb, Cu, Zn, As, Cr and Ni. According to the Igeo, Cd was the most serious pollutant among the seven types of metals, reaching the high pollution level, followed by Cu, Ni, and Cr at medium pollution levels and Pb, Zn, and As at the pollution-free level. According to the PLI, the comprehensive pollution index of the heavy metals in the surface sediments of the upper Hanjiang River was 0.79, which belonged to the pollution-free level. Correlation and principal component analyses indicated that As, Cu, and Cr mainly originated from natural sources; Pb, Zn, and Cd mainly originated from mineral exploitation activities and mineral-smelting sources; and Ni originated from a combination of these sources. There was a low ecological pollution risk of heavy metals in the surface sediments of the upper Hanjiang River, but the potential pollution risk of Cd cannot be ignored. |
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