Abstract
TETRAMETHYLDIAMINODIPHENYLMETHANE (‘tetrabase’) has been widely used for the colorimetric estimation of quantities of manganese of the order of 0.01–0.1 µgm.1–4. As generally applied, the test involves the addition of tetrabase and potassium periodate in excess to a sodium acetate–acetic acid buffer containing manganese in solution. The intensity of the transient blue colour1–3—or more permanent green4—so produced is closely related to the concentration of manganese. The nature of the reaction or of its end-products does not appear to have been elucidated, although it is known that manganese hydroxide reacts with tetrabase to produce a blue colour2, and it has been suggested that in the presence of periodate, manganese acts as a catalyst in the oxidation of tetrabase3.
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References
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SINGLE, W. Colorimetric Estimation of Manganese. Nature 180, 250–251 (1957). https://doi.org/10.1038/180250b0
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DOI: https://doi.org/10.1038/180250b0
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