Copper Speciation and Binding by Organic Matter in Copper-Contaminated Streamwater
Received: February 13, 1996 Revised
July 10, 1996 Accepted July 26, 1996 Abstract: Fulvic acid binding sites (1.3-70 µM) and EDTA
(0.0017-0.18 µM) accounted for organically bound
Cu in seven stream samples measured by potentiometric
titration. Cu was 84-99% organically bound in
filtrates
with 200 nM total Cu. Binding of Cu by EDTA was
limited by competition from other trace metals. Water
hardness was inversely related to properties of
dissolved organic carbon (DOC) that enhance fulvic
acid binding: DOC concentration, percentage of
DOC that is fulvic acid, and binding sites per fulvic acid
carbon. Dissolved trace metals, stabilized by organic
binding, occurred at increased concentration in soft
water as compared to hard water.
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