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Report No.
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Electrochemical study on the redox properties of humic substances from deep sedimentary groundwater

Saito, Takumi; Terashima, Motoki; Onuki, Toshihiko

Redox properties of humic substances extracted from deep sedimentary groundwater was investigated by cyclic voltammetry and bulk electrolysis with a mediator organic molecule. Reversible current-potential curves were observed with the mediator, although electrode reaction of humic substances are slow in general. The redox capacities of various humic substances exhibited positive correlation with their aromaticity; those of deep groundwater humic substances were appreciably smaller than those of surface humic substances.

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