Abstract
For the estimation by polarography of a small amount of tin and antimony present as impurities in iron and steel, it is necessary to remove the effect of interference of iron. Tin and antimony in iron and steel are separated from iron by coprecipitating them with manganese dioxide, the precipitate is decomposed with hydrochloric acid and hydrogen peroxide, the tin is reduced with aluminium foil to Sn++ and polarogram is taken in ammonium chloride solution. Antimony solution is heated with sulfuric acid till the evolution of white fume to turn it into Sb3+ and the polarogram is taken in 0.1 N HCl.Iron and steel containing approximetely 0.020.01% tin and 0.0050.01% antimony are estimated by this method.
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