Distribution Characteristics and Risk Assessment of Heavy Met-als in Wanning Xiaohai
In order to understand the pollution status and the health risk of heavy metals in the seawater and fish organisms of Wanning Xiaohai,this study measured the content of 6 heavy metals(Cu,Pb,Zn,Cd,Hg,and As)in seawater and the muscle tissue of five common economic fish species in Wanning Xiaohai.Single-factor index(Pi,j)and BioConcentration Factor(BCF)were used to evaluate the contamination degree in fish,and Target Risk Factor(THQ)was adopted to assess the health risk of heavy metals to humans.The results showed that the content of Cu,Zn,Cd,and As in the seawater was below the first class seawater standard,while that of Hg and Pb was within the scope of the second class seawater quality standard.The content of Pb in some stations at the tidal channel was within the range of the third class seawater quality standard,exceeding the management requirement.Compared with that in other sea areas in China,the seawa-ter in Wanning Xiaohai demonstrated high content of Pb and Cd,moderate content of Hg,and low content of Cu,As,and Zn.Compared with the historical data,Pb and Hg pollution aggravated.In this study,fish show-cased obvious concentration of Zn,Hg,and As,weak concentration of Pb and Cd,and the As content in some fish exceeding the limits specified in National Food Safety Standard Limits for Contaminants in Food.The evaluation based on Pi,j and THQ showed that the common fish in Wanning Xiaohai had mild pollution of As and Hg,and As was the main health risk element.Long-term moderate consumption of the five common fish species in this sea area will not pose health risks,while the metal pollution of seawater and fish here should still be concerned.The regulatory authorities should strengthen the early warning and monitoring of Pb and Hg in seawater and As and Hg in fish to prevent heavy metal pollution from harming human health.
万方数据
维普
