Copper Speciation and Binding by Organic Matter in Copper-Contaminated Streamwater

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• 作者：Robert F. Breault ; John A. Colman ; George R. Aiken ; and Diane McKnight
• 刊名：Environmental Science & Technology
• 出版年：1996
• 出版时间：December 1996
• 年：1996
• 卷：30
• 期：12
• 页码：3477 - 3486
• 全文大小：425K
• 年卷期：v.30,no.12(December 1996)
• ISSN：1520-5851

文摘

Fulvic acid binding sites (1.3-70 µM) and EDTA(0.0017-0.18 µM) accounted for organically boundCu in seven stream samples measured by potentiometrictitration. Cu was 84-99% organically bound infiltrateswith 200 nM total Cu. Binding of Cu by EDTA waslimited by competition from other trace metals. Waterhardness was inversely related to properties ofdissolved organic carbon (DOC) that enhance fulvicacid binding: DOC concentration, percentage ofDOC that is fulvic acid, and binding sites per fulvic acidcarbon. Dissolved trace metals, stabilized by organicbinding, occurred at increased concentration in softwater as compared to hard water.