Photometric Determination of Tin in Iron and Steel II : Application of the Reaction of Tin and Cacotheline

概要

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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 determined and the analytical procedures were 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 hydro-chloric acid and reduce it with aluminium in a stream of carbon dioxide. The color is developed by adding the cacotheline solution and the determination of tin is carried out by measuring the color density with Pulflich's photometer. The time required for this analysis was about 1.5〜2 hours.
東北大学の論文