A method is described for the spectrophotometric determination of 10∼80μg. of bismuth with Xylenol Orange. The error is not likely to exceed ±10 per cent. The molar extinction coefficient of bismuth in 0.1 n nitric acid solution is 1.6×104 at 530 mμ. Instead of nitric acid perchloric acid or sulfuric acid may also be used. The interference of small amounts of zirconium, thorium, and iron can be eliminated by masking. Lead and thallium do not interfere with the determination of bismuth. A 1 :1 complex of bismuth with Xylenol Orange is suggested.
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Ōnishi et al. (1960) studied this question.
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