用[(Phen-Ag-Phen)_2~+BPR~(2-)]蓝色三元络合物在水相中光度法测定Ag,其稳定性极差,难以应用。本文试验加入表面活化剂CTMAB及乙醇后,效果大为改善,能稳定3小时。应用于铅锌矿中银的测定,结果满意。样品分析步骤称取0.5克样品于烧杯中,加10毫升盐酸,加热微沸数分钟,加硝酸10毫升,低温溶解并蒸干。加2毫升硝酸溶解盐类,加入3克左右的硝酸铵。加热溶化后慢慢加入15毫升浓氨水,微沸2～3分钟。冷却,放置10分钟左右,用中速滤纸过滤,用氨水(1+1)洗涤烧怀及滤纸5～6次。滤液于低温蒸干后再高温灼烧赶尽铵盐(可放入300℃马弗炉中)。冷却后用2毫升硝酸微热溶解盐类,然后放在水浴上蒸干。加约5毫 Spectrophotometric determination of Ag with [(Phen-Ag-Phen) _2 ~ + BPR ~ (2-)] blue ternary complex in the aqueous phase has poor stability and is difficult to apply. In this paper, after adding surfactants CTMAB and ethanol, the effect is greatly improved, which can be stable for 3 hours. Used in lead-zinc mine determination of silver, the results are satisfactory. Sample analysis step Weigh 0.5 g sample in a beaker, add 10 ml of hydrochloric acid, heat micro-boiling for a few minutes, add nitric acid 10 ml, dissolved in low temperature and evaporated to dryness. Add 2 ml of nitric acid to dissolve salts and add about 3 grams of ammonium nitrate. After heating and dissolving, slowly add 15 ml of concentrated ammonia and slightly boil for 2 ~ 3 minutes. Cool, place for about 10 minutes, with medium-speed filter paper, with ammonia (1 + 1) wash burn and filter paper 5 to 6 times. The filtrate was evaporated to dryness at low temperature and then rushed to burn off the ammonium salt (which can be placed in a 300 ° C muffle furnace). After cooling with 2 ml of nitric acid dissolved in salt, and then placed in a water bath and evaporated to dryness. Add about 5 milliliters