微量铋的分光光度测定,过去多用硫脲、碘化钾、二甲酚橙和偶氮肿Ⅲ等作显色剂,这些方法或灵敏度较低、干扰因素多,或操作手续繁杂,不易掌握。近年来,文献中又提出一些新的测定铋的分光光度法,尚未广泛应用。我们在酸性介质中用硼氢化钾将溶液中铋离子转化成铋化氢,再用二乙氨基二硫代甲酸银(简称AgDDC)氯仿溶液吸收,所得有色溶液在一定浓度范围内,其吸光度与铋量成正 Trace bismuth spectrophotometric determination of the past with thiourea, potassium iodide, xylenol orange and azo swollen Ⅲ as a developer, these methods or lower sensitivity, interference factors, or complicated procedures, not easy to grasp. In recent years, the literature also put forward some new spectrophotometric determination of bismuth has not yet been widely used. We use acidic potassium borohydride in the solution of bismuth ions into bismuth, and then diethyldithiocarbamate silver (referred to as AgDDC) chloroform solution, the resulting colored solution in a certain concentration range, the absorbance and Bismuth into positive