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A Novei Approach to Determining a Population-Level Threshold in Ecological Risk Assessment: A Case Study of Zinc

机译:确定生态风险评估中的人口水平阈值的Novei方法:以锌为例

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摘要

A novel approach to population-level assessment was applied in order to demonstrate its utility in estimating and managing the risk of zinc in a water environment. Much attention has been paid to population-level risk assessment, but there have been no attempts to determine a "safe" population-level concentration as an environmental criterion. Based on the published results of toxicity tests for various species, we first theoretically derived a threshold concentration at which a population size is unchanged due to the adverse effects of zinc exposure. To derive a zinc concentration that will protect populations in natural environments, we adopted the concept of species sensitivity distribution. Assuming the threshold concentrations of a set of species are log-normally distributed, we calculated the 95% protection level of zinc (PHC_5:population-level hazardous concentration of 5% of species), which is 107 μg/L. Meanwhile, the 95% protection criterion (HC_5) based on conventional individual-level chronic toxicity, was calculated to be 14.6 μg/L. The environmentally "safe" concentration for a population-level endpoint is about 7 times greater than that for an individual-level endpoint. The proposed method provides guidance for a pragmatic approach to population-level ecological risk assessment and the management of chemicals.
机译:为了证明其在估计和管理水环境中锌风险方面的效用,采用了一种新颖的人口水平评估方法。人们已经非常重视人口水平的风险评估,但是没有尝试确定“安全的”人口水平浓度作为环境标准。基于已发表的各种物种毒性测试的结果,我们首先在理论上得出了阈值浓度,在该阈值浓度下,由于锌暴露的不利影响,种群数量没有变化。为了得出锌的浓度以保护自然环境中的种群,我们采用了物种敏感度分布的概念。假设一组物种的阈值浓度呈对数正态分布,我们计算出95%的锌保护水平(PHC_5:5%物种的种群危险水平),为107μg/ L。同时,基于常规的个人慢性毒性的95%保护标准(HC_5)计算为14.6μg/ L。人口水平终点的环境“安全”浓度约为个人水平终点的7倍。所提出的方法为以实用的方法进行人口级生态风险评估和化学品管理提供了指导。

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