School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; School of Marine Science and Technology, Tianjin University, Tianjin 300072, China.
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
Chemosphere. 2018 Feb;193:403-411. doi: 10.1016/j.chemosphere.2017.11.037. Epub 2017 Nov 9.
The eutrophication of surface water has been the main problem of water quality management in recent decades, and the ecological risk of microcystin-LR (MC-LR), which is the by-product of eutrophication, has drawn more attention worldwide. The aims of our study were to determine the predicted no effect concentration (PNEC) of MC-LR and to assess the ecological risk of MC-LR in the upstream section of the Haihe River. HC (hazardous concentration for 5% of biological species) and PNEC were obtained from a species sensitivity distribution (SSD) model, which was constructed with the acute toxicity data of MC-LR on aquatic organisms. The concentrations of MC-LR in the upstream section of the Haihe River from April to August of 2015 were analysed, and the ecological risk characteristics of MC-LR were evaluated based on the SSD model. The results showed that the HC of MC-LR in freshwater was 17.18 μg/L and PNEC was 5.73 μg/L. The concentrations of MC-LR ranged from 0.68 μg/L to 32.21 μg/L and were obviously higher in summer than in spring. The values of the risk quotient (RQ) ranged from 0.12 to 5.62, suggesting that the risk of MC-LR for aquatic organisms in the river was at a medium or high level during the study period. Compared with other waterbodies in the world, the pollution level of MC-LR in the Haihe River was at a moderate level. This research could promote the study of the ecological risk of MC-LR at the ecosystem level.
地表水富营养化一直是近几十年来水质管理的主要问题，而富营养化的副产品微囊藻毒素-LR（MC-LR）的生态风险已引起全球更多关注。本研究的目的是确定 MC-LR 的预测无效应浓度（PNEC），并评估海河流域上游段 MC-LR 的生态风险。HC（生物物种 5%的危害浓度）和 PNEC 是从物种敏感性分布（SSD）模型中获得的，该模型是使用 MC-LR 对水生生物的急性毒性数据构建的。分析了 2015 年 4 月至 8 月海河流域上游段 MC-LR 的浓度，并根据 SSD 模型评估了 MC-LR 的生态风险特征。结果表明，淡水 MC-LR 的 HC 为 17.18μg/L，PNEC 为 5.73μg/L。MC-LR 的浓度范围为 0.68μg/L 至 32.21μg/L，夏季明显高于春季。风险商（RQ）的值范围为 0.12 至 5.62，表明研究期间河流中 MC-LR 对水生生物的风险处于中等或高水平。与世界其他水体相比，海河流域 MC-LR 的污染水平处于中等水平。本研究可以促进对 MC-LR 在生态系统水平上的生态风险的研究。
