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<p>The deterioration of water quality in Chishui river, a first-class tributary of the Yangtze River, has been reported frequently in the recent years. Many studies are merely focused on physical and chemical indicators of water in Chishui river, while the inner relationship between water quality indexes and heavy metals (HMs) concentrations in the different land use types in Chishui river was ignored. Therefore, the study systematically elaborates the inner relationship between water quality indexes and HMs in the different land use types in Chishui river. The effect of HMs exposure in Chishui river on human body through health risk assessment is also evaluated. The results showed that total nitrogen concentration in Chishui river was gather than the standard level II proposed by Chinese environmental quality standards for surface water (GB3838-2002). HQ and HI values were less than 1 and the non- cancer risk value of the selected HMs did not exceed 1, implying a slight threat to human body. Although the present study did not find that HMs exposure posed a threat to children and adult, it was necessary to the excessive Cd and Cr concentrations in Chishui river. Our results suggested that brewing wastewater maybe the important reason that was the poorest water quality in industrial area. The application of the massive chemical fertilizers cannot be fully absorbed by crops, and the residual part will enter the water body through rainwater runoff or leaching, leading to the relatively poor water quality in agricultural area. The scouring of rainstorm intensified the effect of pollutants generated by baijiu industry, agricultural activities and urbanization on water quality in Chishui river. Our suggestion is that water pollution early warning system and emergency treatment mechanism during rainstorm should be established to ensure drinking water safety, especially in flood season. It is necessary to strengthen the sewage treatment and discharge supervision of industrial point sources such as Baijiu enterprises to reduce their impact on water bodies, especially in the middle and lower reaches. Our study emphasized a reference for treating water quality deterioration in Chishui river and other poor water quality areas by employing analogous environmental protection measures.</p>

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Influence of Different Land-Use Types on Hydrochemistry, Heavy Metals and Health Risks in Surface Water in Chishui Rriver, Southern China

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Xianliang Wu,
  • Jinxing Zhan

摘要

The deterioration of water quality in Chishui river, a first-class tributary of the Yangtze River, has been reported frequently in the recent years. Many studies are merely focused on physical and chemical indicators of water in Chishui river, while the inner relationship between water quality indexes and heavy metals (HMs) concentrations in the different land use types in Chishui river was ignored. Therefore, the study systematically elaborates the inner relationship between water quality indexes and HMs in the different land use types in Chishui river. The effect of HMs exposure in Chishui river on human body through health risk assessment is also evaluated. The results showed that total nitrogen concentration in Chishui river was gather than the standard level II proposed by Chinese environmental quality standards for surface water (GB3838-2002). HQ and HI values were less than 1 and the non- cancer risk value of the selected HMs did not exceed 1, implying a slight threat to human body. Although the present study did not find that HMs exposure posed a threat to children and adult, it was necessary to the excessive Cd and Cr concentrations in Chishui river. Our results suggested that brewing wastewater maybe the important reason that was the poorest water quality in industrial area. The application of the massive chemical fertilizers cannot be fully absorbed by crops, and the residual part will enter the water body through rainwater runoff or leaching, leading to the relatively poor water quality in agricultural area. The scouring of rainstorm intensified the effect of pollutants generated by baijiu industry, agricultural activities and urbanization on water quality in Chishui river. Our suggestion is that water pollution early warning system and emergency treatment mechanism during rainstorm should be established to ensure drinking water safety, especially in flood season. It is necessary to strengthen the sewage treatment and discharge supervision of industrial point sources such as Baijiu enterprises to reduce their impact on water bodies, especially in the middle and lower reaches. Our study emphasized a reference for treating water quality deterioration in Chishui river and other poor water quality areas by employing analogous environmental protection measures.