淡水环境中双酚A的长期水质基准推导及生态风险评估

Derivation of Long-term Water Quality Criteria and Ecological Risk Assessment of Bisphenol A in Freshwater Environment

  • 摘要: 双酚A(BPA)是一种内分泌干扰物,目前国内外地表水水质标准均缺乏BPA的环境质量限值,针对淡水环境开展BPA水质基准研究迫在眉睫。本研究搜集筛选出BPA对8门23科共30种本土淡水生物的慢性毒性数据,基于Boltzmann、DoseResp、Langevin、SGompertz、Slogistic和SRichards共6种分布模型,在系统尺度上构建了BPA的物种敏感度分布曲线,运用最优函数推导出淡水环境中BPA的长期水质基准值为1.44 μg·L-1。分别利用风险熵法(RQ)和安全阈值法(ST)评估了国内22处淡水水体中BPA的长期生态风险,风险表征结果显示,无风险及低风险占比为27.27%,高风险、中风险占比分别为22.73%和50.00%。研究结果可为我国地表水BPA水质标准制定及生态风险评估提供科学依据。

     

    Abstract: Bisphenol A (BPA) is an endocrine disruptor, and currently, there are no environmental thresholds for BPA in surface water quality standards, both domestically and internationally. It is urgent to conduct researches on the water quality standards of BPA in freshwater environments. This study collected and screened chronic toxicity data of BPA on 30 native freshwater organism species belonging to 8 phyla and 23 families, and constructed species sensitivity distribution curves on a system scale using six distribution models, including Boltzmann, DoseResp, Langevin, SGompertz, Slogistic, and SRichards. The long-term water quality criteria value for BPA in freshwater environments was derived as 1.44 μg·L-1 by using the optimal function. Meanwhile, the long-term ecological risks of BPA in 22 freshwater bodies in China were evaluated using the risk quotient (RQ) and the safety threshold (ST) methods, respectively. The calculated risk results show that the proportion of risk-free and low risk was only 27.27%, while the proportion of high risk and moderate risk was 22.73% and 50.00%, respectively. The research results can provide scientific evidence for the formulation of quality standard and ecological risk assessment of BPA for surface water in China.

     

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