研究了在阴离子表面活性剂存在的条件下,银与2-[3,5-二溴-2-吡啶偶氮]-5-二乙氨基苯酚的反应条件。阴离子表面活性剂十二烷基硫酸钠能使Ag-2-[3,5-二溴2-吡啶偶氮]-5-二乙氨基苯酚配合物增敏,其最大吸收峰位于565nm处,摩尔吸光系数为6.4×10~4L·mol~(-1)·cm~(-1),在0～0.48μg/ml时符合比尔定律。试剂与Ag~+形成2:1的配合物。此方法用于纯铅及铅锑合金中银的测定,可获得满意的结果。 The reaction conditions of silver with 2- [3,5-dibromo-2-pyridylazo] -5-diethylaminophenol were studied in the presence of anionic surfactants. The anionic surfactant sodium dodecyl sulfate sensitized Ag-2- [3,5-dibromo-2-pyridylazo] -5-diethylaminophenol complex with its maximum absorption peak at 565nm, The extinction coefficient was 6.4 × 10 ~ 4L · mol -1 (-1) cm -1 and Beer’s law was obeyed at 0 ~ 0.48μg / ml. The reagent forms a 2: 1 complex with Ag ~ +. This method is used for the determination of silver in pure lead and lead-antimony alloys and gives satisfactory results.