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在0．01mol／lHNO3介质中，溴化十四烷基吡啶（TPB）表面活性剂存在下，铋与偶氮肿Ⅲ形成络合物，最大吸收波长为630nm，表观摩尔吸光系数为6．50×104l-1·cm-1，铋在0～30μg／25ml范围内服从比尔定律，铋与偶氮胂Ⅲ络合比1：2．拟定的方法测定黄铜中铋，结果满意．
In the presence of 0.01 mol / l HNO3 in the presence of tetradecylpyridine (TPB) surfactant, bismuth complexed with azo nitrogen Ⅲ and the maximum absorption wavelength was 630 nm with an apparent molar absorptivity of 6. 50 × 104l-1 · cm-1. Bismuth obeys Beer’s law in the range of 0 ~ 30μg / 25ml. The complex ratio of bismuth to arsenazo Ⅲ is 1: 2. The proposed method for the determination of bismuth in brass was satisfactory.