Model-averaging species sensitivity distributions of perfluorooctanoic acid and its ecological risk assessment
In this study,30 aquatic species and their associated 53 single toxicity data were collected and screened.Based on different toxicity endpoint data,an Species Sensitivity Distribution(SSD)model for perfluorooctanoic acid(PFOA)was created.In order to reduce the uncertainty introduced by model selection,the model-averaging method was employed and applied to ecological risk assessment.According to the data on lethality,growth inhibition,reproductive toxicity,and biochemical toxicity,the derived Predicted No-Effect Concentration(PNEC)values were 2.09,0.02,0.006,and 0.024mg/L,respectively.It is noteworthy that under PFOA exposure,the reproductive endpoint of aquatic species exhibited the highest sensitivity.Therefore,the PNEC value based on the reproductive toxicity endpoint was selected as the Aquatic Life Criteria(ALC)for PFOA.Furthermore,PFOA exposure concentration data in surface water from the Yangtze River basin were collected,and the ecological risk of surface water in the Yangtze River basin was assessed using the Hazard Quotients(HQ)method.The research results indicate that among the 12sampling sites in the Yangtze River basin,the HQ values of all surface water samples range from 0.0004 to 0.04,suggesting that the ecological risk of PFOA in the Yangtze River basin is low.The findings of this study provide important references for aquatic bioprotection and mitigating the ecological risks of PFOA in China.
perfluorooctanoic acidmodel-averaging methodecological risk assessmentYangtze River basin
万方数据
维普
