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较详细研究了在12种非离子表面活性剂或水溶性高分子化合物分别存在下,Ag(Ⅰ)-SCN~--罗丹明 B 体系水相光度法测定痕量银的新方法。首次将 AEO-7引入光度分析。详细研究了 Ag(Ⅰ)-SCN~--罗丹明 B-AEO-7和 Ag(Ⅰ)-SCN~--罗丹明 B-阿拉伯树胶体系,其最大吸收峰分别在603和588 nm 处。表观摩尔吸光系数ε分别为4.17×10~5L·mol~(-1)·cm~(-1)和2.73×10~5L·mol~(-1)·cm~(-1)。Sandell 灵敏度为2.59×10~(-4)μgAg/cm~2和3.95×10~(-4)μgAg/cm~2。银含量在0.5~2.0μg/25 mL 和0.5~5.0μg/25 mL范围内遵守比尔定律。方法用于中草药银花和黄连以及人发中痕量银的测定,结果满意。
A new method for the determination of trace silver with aqueous Ag (Ⅰ) -SCN ~ -rhodamine B system in the presence of 12 nonionic surfactants or water-soluble polymers has been studied in detail. For the first time, AEO-7 was introduced into the photometric analysis. The maximum absorption peaks of Ag (Ⅰ) -SCN ~ - rhodamine B-AEO-7 and Ag (Ⅰ) -SCN ~ -rhodamine B-gum arabic were studied at 603 and 588 nm, respectively. The apparent molar absorptivities ε were 4.17 × 10 ~ 5L · mol -1 · cm -1 and 2.73 × 10 ~ 5L · mol -1 · cm -1, respectively. The sensitivity of Sandell was 2.59 × 10 -4 μg Ag / cm 2 and 3.95 × 10 -4 μg Ag / cm 2. Beer’s law is obeyed in the range of 0.5 ~ 2.0μg / 25mL and 0.5 ~ 5.0μg / 25mL. The method was applied to the determination of trace silver in Chinese herbal medicine Yinhua and Coptidis Rhizoma and human hair with satisfactory results.