Abstract
The stability of acidic tin(II) solutions was investigated polarographically in the presence of substances with mild antioxidant properties. The best stabilizing action is exerted by pyrogallol, hydrazine or phenolsulphonic acid. In methanolic solutions containing perchloric acid, the stability improves whereas chloride ions hasten the oxidation of tin(II). It is shown that the enhanced stability is due neither to complexation of tin(II) nor to reduction of oxygen by the antioxidants used. The fact that some of the reagents tested exert a powerful stabilizing action even in very small concentrations supports an earlier suggestion that the reaction between tin(II) and oxygen is a chain reaction which is inhibited by the stabilizer.
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