ホワイトメタル中のスズおよびアンチモンの容量分析

概要

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A modified method based on JIS and ASTM for continuous determination of tin and antimony in white metal has been planned out. 0.3 to 1 g of sample is decomposed in 20 ml of sulphuric acid and 4 g of potassium sulphate mixture, and 40 ml of hydrochloric acid and 50 ml of water added, and boiled about 5 min. After cooling, the solution is diluted to 250 ml, and antimony is titrated with N/10 potassium permanganate. Continuously, 10 g of sodium hypophosphite and 5 ml of saturated mercuric chloride solution are added to the previously titrated solution. Then, tin (IV) is reduced to the stannous state by heating in a carbon dioxide atomosphere. After cooling in ice water, tin is titrated with N/10, or N/50 iodine standard solution. The expelling techniques of sulfur dioxide and arsenic, which interfere with the determination of tin and antimony, were studied in detail.
社団法人日本分析化学会の論文