A method is described for the determination of bismut h in lead-base and tin-base allovs. Tin, arsenic, and antimony are volatilized a s t he bromides from a perchloric acid solution. The bismuth is t hen precipitated a s the oxychloride in a perchloric-nitric acid solution. The precipitate is dissolved in nitric acid, and the bismuth is treated wit h thiourea to form a yellow comp!ex. The ab s ~r~a~cy of the colored solution is ~easured. with a filter phot ometer a t approximately 425 mllhmlCrons , and the amount of bis muth I S read from a curve prepared by trea ting known amoun t~ of bismuth with thiourea. An accuracy of 0.002 percent of bismuth is indicated for lead-base and tin-base alloys containing from 0 .02 to O.lO percent .
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Bendigo et al. (1951) studied this question.