Wang Xiao-nan, Yan Zhen-guang, Liu Zheng-tao, Zhang Cong, Wang Wei-li
Huan Jing Ke Xue. 2015 Jul;36(7):2414-21.
In this study, toxicity data of aquatic species in Liaohe River for heavy metal chromium (VI) was collected and selected. The aquatic life criteria for chromium (VI) in Liaohe River was derived based on these toxicity data. Moreover, water samples of 25 sites in Liaohe River were collected, and the concentrations of chromium (VI) in these samples were analyzed. Finally, ecological risk assessment of chromium (VI) in Liaohe River was performed. Moreover, interspecies correlation estimation method (ICE) established by US EPA was used to predict the acute toxicity of species in Liaohe River, and aquatic life criteria based on predicted toxicity data was derived. The results showed that: the measured CMC (criteria maximum concentration), measured CCC (criteria continuous concentration) and the predicted CMC were 17. 73, 12. 15 and 13. 97 µg . L -1, respectively. Therefore, the ICE method could be used to predict the aquatic life criteria, because the predicted criteria value was very similar to the measured criteria value. Analysis of chromium (V) showed that the chromium (VI) concentrations of the 25 sites in Liaohe River were all below Class I or Class II water quality standards (GB 3838-2002), and the water quality was in good condition. However, for the potential risk of chromium (VI) exposure to the aquatic life of Liaohe River, the result of ecological risk assessment showed that chromium (V) concentrations in 7 sites exceeded the CCC in July, and chromium (VI) concentrations in 6 sites exceeded the CCC in December. Therefore, unacceptable effect on aquatic species caused by chromium (VI) exposure might have occurred in some sites of Liaohe River.
本研究收集并筛选了辽河水体中重金属铬（VI）的水生生物毒性数据，基于这些毒性数据推导了辽河铬（VI）的水生生物基准。此外，采集了辽河25个点位的水样，分析了这些样品中铬（VI）的浓度。最后，对辽河铬（VI）进行了生态风险评估。同时，采用美国环保署建立的物种间相关性估计方法（ICE）预测辽河物种的急性毒性，并推导基于预测毒性数据的水生生物基准。结果表明：实测临界最大浓度（CMC）、实测连续浓度（CCC）和预测CMC分别为17.73、12.15和13.97μg·L-1。因此，ICE方法可用于预测水生生物基准，因为预测基准值与实测基准值非常接近。铬（VI）分析表明，辽河25个点位的铬（VI）浓度均低于《地表水环境质量标准》（GB 3838—2002）Ⅰ类或Ⅱ类水质标准，水质状况良好。然而，对于铬（VI）对辽河水生生物的潜在暴露风险，生态风险评估结果显示，7个点位的铬（VI）浓度在7月超过了CCC，6个点位的铬（VI）浓度在12月超过了CCC。因此，辽河部分点位可能已发生铬（VI）暴露对水生生物产生不可接受的影响。
