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| Model-averaging species sensitivity distributions of perfluorooctanoic acid and its ecological risk assessment |
| GUAN Shuo1, JIN Zhong-wu1, DING Bing1, GU Yan-sheng2, LIU Xiao-guang1 |
1. Key Laboratory of River and Lake Regulation and Flood Control in the Middle and Lower Reaches of the Yangtze River of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan 430010, China;
2. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China |
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Abstract 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.
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Received: 24 May 2025
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