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• W2020630688 abstract "Recent evidence indicates that organic environmental contaminants associate with or bind to dissolved humic materials. Binding constants for many systems have been determined, but little is known about the nature of these interactions. Using UV difference spectroscopy we have established the electron donating ability of humic materials and introduced a simple, direct method for measuring binding constants. Chloranil (tetrachlorobenzoquinone), a well known electron acceptor, was combined with Aldrich humic materials (2.7 mg C/l) giving rise to a shift in the chloranil 290 nm band. Spectra of several such solutions with differing chloranil concentrations when analyzed versus a chloranil reference contained a negative peak at this wavelength due to the binding interaction. The concentration of bound chloranil could be directly determined by measurement of the negative peak. The binding constant (Kdoc) for the chloranil-humic system was determined to be 1.2 × 105. Binding continued to occur over a period of several weeks, indicating that studies which measured binding constants for relatively short periods of time may have generated binding constants which were lower than those applicable to the environment. A charge transfer mechanism can be postulated for the chloranil-humic system as well as for similar systems." @default.
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• W2020630688 date "1987-01-01" @default.
• W2020630688 modified "2023-09-24" @default.
• W2020630688 title "Evidence for a charge-transfer interaction between dissolved humic materials and organic molecules: I. Study of the binding interaction between humic materials and chloranil" @default.
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• W2020630688 doi "https://doi.org/10.1016/0045-6535(87)90049-x" @default.
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