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Distribution and risk assessment of heavy metals in surface water of Tuojiang River basin
CHEN Jia-luo, WEI Yao, WANG Tao
HUBEI AGRICULTURAL SCIENCES
2022, 61 (5):
76-82.
DOI: 10.14088/j.cnki.issn0439-8114.2022.05.015
In order to understand the distribution of heavy metalsand health risks under pollution levels in the Tuojiang River of Sichuan Basin. In 2018, the contents of 7 heavy metals Hg, Pb, Cu, Zn, As, Cd, Cr（Ⅵ） in the surface water of 24 sites in the Tuojiang River were investigated and their temporal and spatial distribution characteristics were analyzed, and then the heavy metal pollution index （HPI） and health risk assessment model were used to evaluate the risk of heavy metals in the waters of Tuojiang River. The results showed that the overall concentration of heavy metals in the waters of Tuojiang River was maintained at a low level,lower than the “Surface Water Environmental Quality Standard” Class I standard, and there was no obvious pollution. In some densely populated areas, the concentration of heavy metals in some river sections increased slightly, but they were all lower than the “Surface Water Environmental Quality Standard” Class I standard; In the main stream of the Tuojiang River, except for the seasonal variation of Cu and Zn concentrations, the seasonal variation of other heavy metal concentrations was not obvious. From the spatial distribution, the Cu concentration peak appeared in the Qiuxi River and the Zn concentration was higher in Pihe and Qiuxi River. The peaks of Cd concentration appeared in Jiuqu River and Yanghua River. The concentration of As and Pb were higher in the middle and lower reaches of Tuojiang River, and the spatial distribution of Hg and Cr（Ⅵ） concentration was not significantly different; The results of HPI and health risk assessment showed that the heavy metal pollution of surface water in the Tuojiang River posed a low risk to human health.
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