Abstract
THE decrease of manganous ion concentration which occurs when a manganous salt is shaken with manganese dioxide has been known for a long time. Being most marked with freshly precipitated oxides, it is not surprising it should first have been considered an adsorption. For some time this observation has found practical application in the removal of soluble manganese in water supplies1, while recently it has been shown of significance in the chemistry of the dry cell depolarizer2, and also in the oxidation-reduction cycle of manganese in the soil3,4.
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