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首页> 外文期刊>Environmental toxicology and chemistry >HETEROGENEITY IN PHYSICOCHEMICAL PROPERTIES EXPLAINS DIFFERENCES IN SILVER TOXICITY AMELIORATION BY NATURAL ORGANIC MATTER TO DAPHNIA MAGNA
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HETEROGENEITY IN PHYSICOCHEMICAL PROPERTIES EXPLAINS DIFFERENCES IN SILVER TOXICITY AMELIORATION BY NATURAL ORGANIC MATTER TO DAPHNIA MAGNA

机译：理化性质的非均质性解释了天然有机物对麻疯树的银毒性缓解作用的差异。

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摘要

Recently collected data have shown that natural organic matter (NOM) source is an important parameter influencing the toxicity of silver to the freshwater crustacean Daphnia magna. The present study attempted to correlate the physicochemical properties of 11 naturally isolated and commercially available NOM sources with their ameliorative effects. The protection offered by these samples was standardized to the protective effect of Aldrich humic acid using geochemical modeling approaches that accounted for associated changes in water chemistry and, consequently, silver speciation. The protective ability of NOM was not correlated with reactive siilflde or nitrogen content, which are considered to be strong silver-binding ligands. Color (specific absorbance coefficient) was positively correlated with protection but narrowly eluded statistical significance. The peak wavelength of emission fluorescence following excitation at 370 nm and the fluorescence index values of NOM samples were significantly correlated with protective effects, suggesting that aromatic carbon content may govern the ameliorative actions of NOM. Simple optical properties may therefore act as a suitable indicator for the ability of a given NOM to protect against waterborne silver toxicity to D. magna as long as changes in water chemistry and, thus, silver speciation, are considered.
机译：最近收集的数据表明，天然有机物（NOM）来源是影响银对淡水甲壳类水蚤（Daphnia magna）毒性的重要参数。本研究试图将11种天然分离的和可商购的NOM来源的物理化学特性与其改善作用相关联。这些样品提供的保护作用已通过地球化学建模方法标准化为Aldrich腐植酸的保护作用，该方法考虑了水化学的相关变化，因此也解释了银的形态。 NOM的保护能力与反应性甲硅烷基或氮含量无关，后者被认为是强的银结合配体。颜色（比吸收系数）与保护呈正相关，但在统计学意义上微不足道。 370 nm激发后发射荧光的峰值波长和NOM样品的荧光指数值与保护作用显着相关，表明芳香碳含量可能决定NOM的改善作用。因此，只要考虑到水化学的变化以及因此所形成的银的形态变化，简单的光学性质就可以作为给定NOM防止水银对巨鳞藻的毒性的合适指标。

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