Abstract
Studies were made at first on the separation of tin in iron and steel. The separation of small amount of tin in a sample was difficult by the usual separation method by hydrogen sulfide, therefore the separation of tin by coprecipitation with manganese dioxide was tried. The conditions of precipitation were decided and the analytical procedures of tin in iron and steel were proposed as follows. Dissolve the sample with nitric acid, dilute with water, and add the manganese sulfate solution. Then add the potassium permanganate solution to the boiling solution and, thus precipitate manganese dioxide. Filter and wash the precipitate, dissolve it with hydrochloric acid and reduce it by aluminium in a stream of carbon dioxide. The colour is developed by adding the cacotheline solution and the determination of tin is carried out by measuring the colour density with Pulflich’s photometer. The time required for this analysis was about 1.5∼2 hours.
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