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首页> 外文期刊>Journal of the Brazilian Chemical Society >The effects of solar irradiation on copper speciation and organic complexation
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The effects of solar irradiation on copper speciation and organic complexation

机译：太阳辐射对铜形态和有机络合的影响

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The aims of this research were to evaluate the effects of solar irradiation on copper speciation in water samples obtained in eutrophic and metal contaminated reservoir. Anodic stripping voltammetry and ion selective electrode were used for metal determinations of solar irradiated and non-irradiated samples. The results showed that after 7 h of solar irradiation, dissolved organic matter (DOM) was degraded promoting the increase of labile, free Cu2+ ions and dissolved inorganic carbon (DIC). Decreases of ligand concentration (C L) and dissolved organic carbon (DOC) were also observed. Conditional stability constant (logK') values varied for two sampling sites, but remained unchanged for the others. The present results demonstrated that photochemical reactions affected copper speciation and Cu-DOM interactions. This research is a contribution to the understanding of biogeochemical cycle of copper and highlights some ecological implications of photooxidation in freshwater ecosystems, such as the increase of copper bioavailability.
机译：这项研究的目的是评估富营养化和金属污染的水库中水样中太阳辐射对铜形态的影响。阳极溶出伏安法和离子选择电极用于测定太阳辐照和非辐照样品的金属含量。结果表明，日光照射7h后，可溶性有机物（DOM）降解，促进了不稳定，游离Cu2 +离子和可溶性无机碳（DIC）的增加。还观察到配体浓度（C L）和溶解的有机碳（DOC）的降低。两个采样点的条件稳定性常数（logK'）值不同，而其他采样点则保持不变。目前的结果表明，光化学反应影响了铜的形态和Cu-DOM的相互作用。这项研究有助于理解铜的生物地球化学循环，并强调了淡水生态系统中光氧化的某些生态影响，例如铜生物利用度的增加。

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