Abstract：
Microplastics (MPs) in the water environment pose a potential threat to aquatic organisms. The Species Sensitivity Distribution (SSD) method was used to assess the ecological risks of microplastics on aquatic organisms in this study. However, the limited toxicity data of aquatic organisms made it impossible to derive water quality criteria (WQC) for MPs and difficult to implement an accurately ecological risk assessment. To solve the data gaps, the USEPA established the interspecies correlation estimation (ICE) model, which could predict toxicity data to a wider range of aquatic organisms and could also be utilized to develop SSD and HC5 (hazardous concentration, 5th percentile). Herein, we collected the acute toxicity data of 11 aquatic species from 10 families in 5 phyla to fit the metrical-based SSDs, meanwhile generating the ICE-based-SSDs using three surrogate species (Oncorhynchus mykiss, Hyalella Azteca, and Daphnia magna), and finally compared the above SSDs, as well as the corresponding HC5. The results showed that the measured HC5 for acute MPs toxicity data was 112.3 μg/L, and ICE-based HC5 was 167.2 μg/L, which indicated there were no significant differences between HC5 derived from measured acute and ICE-based predicted values thus the ICE model was verified as a valid approach for generating SSDs with limited toxicity data and deriving WQC for MPs.
摘要：
水环境中的微塑料（MPs）对水生生物构成潜在威胁。本研究采用物种敏感性分布（SSD）方法评估微塑料对水生生物的生态风险。然而,水生生物的毒性数据有限，因此无法得出MPs的水质标准（WQC），并且难以实施准确的生态风险评估。为了解决数据差距，美国环保局建立了种间相关性估计(ICE)模型，它可以预测对更广泛的水生生物的毒性数据，也可以用于开发SSD和HC5(危险浓度，第5百分位数）。在这里，我们收集了来自5门10科的11种水生物种的急性毒性数据，以适应基于度量的SSD，同时使用三种替代物种(Oncorhynchusmykiss，HyalellaAzteca,和大型水蚤)，最后比较了上述SSD，以及相应的HC5。结果表明，测定的HC5对MPs的急性毒性数据为112.3μg/L，基于ICE的HC5为167.2μg/L，这表明从测量的急性和基于ICE的预测值得出的HC5之间没有显着差异，因此ICE模型被验证为生成具有有限毒性数据的SSD并得出MPs的WQC的有效方法。
