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首页> 外文期刊>Environmental toxicology and chemistry >MODELING SILVER BINDING TO GILLS OF RAINBOW TROUT (ONCORHYNCHUS MYKISS)
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MODELING SILVER BINDING TO GILLS OF RAINBOW TROUT (ONCORHYNCHUS MYKISS)

机译：银绑定到虹鳟G（ONCORHYNCHUS MYKISS）的建模

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摘要

Rainbow trout (Oncorhynchus mykiss, 1-3 g) were exposed to ～0.1 μM silver (Ag) (～11 μg·L~(-1) Ag) for 2 to 3 h in synthetic soft water (Ca, Na ～300 μM, pH 6.5-7.5) to which was added Ca, Na, H~+, dissolved organic carbon (DOC), Cl, or thiosulfate (S_2O_3). Gills were extracted and gill Ag concentrations were measured using graphite-furnace atomic absorption spectrophotometry. The concentrations of cations (Ca, Na, H~+) and complexing agents (DOC, Cl, S_2O_3) needed to keep Ag off the gills were used to calculate conditional equilibrium binding constants (K) at the gills. Log K for Ag-gill binding was 10.0, with approximately 1.3 nmol Ag binding sites per fish. All experimentally determined log lvalues were entered into an aquatic chemistry equilibrium model, MINEQL~+, to predict Ag binding at trout gills. For a series of natural waters, model-predicted gill Ag concentrations correlated well with observed gill Ag concentrations, with one exception, very hard city of Waterloo tapwater. This exception may indicate a kinetic constraint on the thermodynamic basis of the model.
机译：在合成软水（Ca，Na〜300μM）中，虹鳟鱼（Oncorhynchus mykiss，1-3 g）暴露于〜0.1μM银（Ag）（〜11μg·L〜（-1）Ag）中2至3 h。 （pH 6.5-7.5），向其中加入Ca，Na，H〜+，溶解的有机碳（DOC），Cl或硫代硫酸盐（S_2O_3）。提取，并使用石墨炉原子吸收分光光度法测量g Ag浓度。使银脱离the所需的阳离子（Ca，Na，H〜+）和络合剂（DOC，Cl，S_2O_3）的浓度用于计算the的条件平衡结合常数（K）。 Ag-g结合的Log K为10.0，每条鱼约有1.3 nmol Ag结合位点。将所有实验确定的对数左值输入水生化学平衡模型MINEQL〜+，以预测鳟鱼g处的Ag结合。对于一系列的天然水，模型预测的g银浓度与观察到的g银浓度相关性很好，唯一的例外是非常坚硬的滑铁卢自来水城。该例外可能表明在模型的热力学基础上存在动力学约束。

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