溶解性有机碳组成对生物配体模型预测Cu毒性的影响
Influence of Dissolved Organic Carbon Composition on Prediction of Copper Toxicity to Medaka by Biotic Ligand Model
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摘要: 为揭示溶解性有机碳(DOC)的组成对生物配体模型(BLM)预测铜的生物毒性准确性的影响,研究了不同浓度黄腐酸 (FA)、腐殖酸(HA)和两者不同浓度比例混合物影响铜对青鳉急性毒性。结果表明:在相同水质条件下,黄腐酸或腐殖酸浓度增加时,铜对青鳉的LC50 均增加;两者共存时,当腐殖酸质量百分比从10%增至90%时,铜对青鳉的LC50 也增加。当天然水中DOC的组成不确定时,可假设HA和FA的组成比例为1:1,此时BLM 预测铜对青鳉的LC50 的偏差最小。Abstract: To study the influence of the composition of dissolved organic carbon (DOC) on predicting the uncertainty of copper toxicity by the biotic ligand model (BLM), three sets of toxic bioassays were performed to study the influences of humic acid (HA) and fulvic acid (FA) at different concentrations, and various mixtures of both HA and FA on copper acute toxicity to medaka. The results indicated that LC50 of copper to medaka increased with the concentration of HA or FA increasing in same water. As the weight percent of HA added from 10% to 90% when HA and FA in the same water, LC50 of copper to medaka also increased. To natural waters with unknown DOC compositions, when the ratio of HA and FA was assumed to be 1:1, the predicted LC50 by BLM would be optimized.
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Key words:
- DOC /
- fulvic acid /
- humic acid /
- biotic ligand model /
- copper /
- medaka
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