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首页> 外文期刊>Environmental toxicology and chemistry >AN EVALUATION OF BIOTIC LIGAND MODELS PREDICTING ACUTE COPPER TOXICITY TO DAPHNIA MAGNA IN WASTEWATER EFFLUENT
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AN EVALUATION OF BIOTIC LIGAND MODELS PREDICTING ACUTE COPPER TOXICITY TO DAPHNIA MAGNA IN WASTEWATER EFFLUENT

机译：预测废水中铅对食蟹蚤严重毒性的生物配体模型的评估

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摘要

The toxicity of Cu to Daphnia magna was investigated in a series of 48-h immobilization assays in effluents from four wastewater treatment works. The assay results were compared with median effective concentration (EC50) forecasts produced by the HydroQual biotic ligand model (BLM), the refined D. magna BLM, and a modified BLM that was constructed by integrating the refined D. magna biotic ligand characterization with the Windermere humic aqueous model (WHAM) VI geochemical speciation model, which also accommodated additional effluent characteristics as model inputs. The results demonstrated that all the BLMs were capable of predicting toxicity by within a factor of two, and that the modified BLM produced the most accurate toxicity forecasts. The refined D. magna BLM offered the most robust assessment of toxicity in that it was not reliant on the inclusion of effluent characteristics or optimization of the dissolved organic carbon active fraction to produce forecasts that were accurate by within a factor of two. The results also suggested that the biotic ligand stability constant for Na may be a poor approximation of the mechanisms governing the influence of Na where concentrations exceed the range within which the biotic ligand stability constant value had been determined. These findings support the use of BLMs for the establishment of site-specific water quality standards in waters that contain a substantial amount of wastewater effluent, but reinforces the need for regulators to scrutinize the composition of models, their thermodynamic and biotic ligand parameters, and the limitations of those parameters.
机译：在一系列的48小时固定化分析中，对来自四个废水处理厂的废水进行了研究，研究了Cu对大型蚤的毒性。将测定结果与HydroQual生物配体模型（BLM），精制D.magna BLM以及通过将精制D.magna生物配体表征与HPLC整合而构建的改良BLM产生的中值有效浓度（EC50）预测值进行比较温德米尔腐殖酸水模型（WHAM）VI地球化学形态模型，该模型还提供了其他出水特征作为模型输入。结果表明，所有BLM均能够在2倍以内预测毒性，并且改良的BLM产生了最准确的毒性预测。精制的D. magna BLM提供了最强有力的毒性评估，因为它不依赖于包含废水特征或对溶解的有机碳活性成分进行优化，以得出准确度在2倍以内的预测。结果还表明，对于Na而言，生物配体稳定常数可能与控制Na影响的机制的近似值差，其中浓度超过确定生物配体稳定常数值的范围。这些发现支持使用BLM在含有大量废水的水中建立现场特定的水质标准，但也需要监管机构仔细研究模型的组成，其热力学和生物配体参数以及这些参数的局限性。

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