摘要
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 TPB, a violet-red complex of bismuth arsenazo Ⅲ is formed immediately at 0.01mol/l HNO3 medium. In the composition ratio of 1: 2, its maximum absorbance is measured at 630 nm, and the molar absorptivity is 6.50x 104 l-1· cm- 1. Beer's law is obeyed for solutions containing 0-30μg/25ml bismuth. This method is successfully applied to the determination of micro amounts Bi in brass.
