Analysis of Microquantities of Antimony, Tin and Arsenic in Ferrotungsten

概要

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It is very difficult to determine microamounts of impurities in ferrotugsten. Antimony, tin and arsenic have been determined by volumetric or gravimetric method in JIS and A. S. T. M., so the determination of microquantities of these elements is difficult. The photometric method would be suitable for this purpose. The spectrophotometric determinations of antimony, tin and arsenic in ferrotungsten by a routine method developed in our laboratory are described here, that is, after these elements were separated as sulfide from main elements such as iron, tungsten and others, the precipitates obtained were dissolved and a certain definite amount of this solution was used in the following procedure. Arsenic with one protion of it was determined with molybdenum blue method directly, and antimony and tin with other portion of it were separated from copper and others by the coprecipitation with manganese dioxide and then determined respectively by methyl violet-amyl acetate extraction method and cacotherine method.