本文研究了ＰＡＮ－Ｓ铋的显色反应。配合物的最大吸收峰位于５４６ｎｍ处，表现摩尔吸光系数为１．２０×１４￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），铋量ρ（Ｂｉ）／（μｇ·ｍｌ￣（－１））在０－２．４范围内符合比尔定律，采用疏基棉分离常见干扰离子富集铋，使选择性和灵敏度显著提高，方法用于水及矿石中铋的测定，结果满意。 In this paper, the color reaction of PAN-S bismuth was studied. The maximum absorption peak of the complex was at 546 nm, showing a molar absorptivity of 1.20 × 14-4L · mol -1 (-1) · cm -1 and a bismuth content of (Bi) / (μg · ml -1) -1)), Beer’s law was obeyed in the range of 0-2.4, and the common interference ions were enriched with sparse base cotton to enrich bismuth, which improved the selectivity and sensitivity remarkably. The method was applied to the determination of bismuth in water and ore with satisfactory results.