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Assessment of heavy metal accumulation in freshwater fish of Dongting Lake,China:Effects of feeding habits,habitat preferences and body size

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Journal of Environmental Sciences 2022年第2期34卷 355-365页

作者： Xiaoming Jiang Jun Wang Baozhu Pan Dianbao Li Yuzhu Wang Xinyuan Liu State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China Xi'an University of TechnologyXi'an 710048China

We measured the concentrations of Cr,Fe,Ni,Cu,Zn,Cd,Pb and Hg,and the stable isotope ratios(δ^(13)C and δ^(15)N)in 87 fish samples within 12 economic fish species collected from the Dongting Lake,the second largest freshwater lake in *** few exceptions in concentration of Cr,most of fish species showed lower concentrations of the 8 metals than legislation *** fishes had significantly higher values of δ^(15)N(possessing higher trophic level)and metal concentrations than planktivorous and herbivorous ***,demersal fishes showed higher concentrations of Cu,Zn,Cd and Pb than pelagic and benthopelagic *** found positive correlations between concentrations of Fe,Pb and Hg and δ^(15)N ratio,confirming the biomagnification of the three metals through trophic *** contrast,fishes showed clear growth dilution effect for Ni,Zn,Cu,Pb and Hg,indicated by the negative correlations between their concentrations and fish weight or *** regression analysis demonstrated that growth dilution and biomagnification effects simultaneously governed the metal concentrations in fish muscle,and the two effects'importance varied among different *** human health risk assessment indicated that all 8 metals gave target hazard quotient(THQ)values<1.0,i.e.,the estimated daily intake(EDI)of metals did not exceed the oral reference dose(Rf D),indicating a safe consumption of these fish species for *** study provides comprehensive approaches to better understand the determining processes and potential risk of heavy metals in freshwater lake fishes.

关键词： Heavy metals Stable isotope ratio Biomagnification growth dilution Risk assessment Edible fishes

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