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在浓度为 0 .0 5 mol/L的 H3PO4介质中 ,痕量锡对 Na H2 PO2 还原罗丹明B(Rh B)褪色反应有催化作用 ,褪色程度与 Sn含量线性相关 ,建立了催化吸光光度法测定痕量 Sn的方法。褪色反应随温度升高而加快 ,在沸水浴中 5 min,ΔA可达最大值 ,流水冷却后吸光度保持 12 h基本不变 ,溶液的最大吸收波长为 5 5 5 nm。方法检出限为 0 .0 35μg/L,吸光度变化与 Sn的质量浓度在 0～ 1.0μg/5 0 m L范围内符合比耳定律。本法已用于测定煤矸石中的微量 Sn。
In H3PO4 medium at a concentration of 0. 5 mol / L, trace amounts of tin catalyzed the fading reaction of rhodamine B (Rh B) with Na H2 PO2. The degree of fading was linearly correlated with the content of Sn. A catalytic spectrophotometry Method for the determination of trace Sn. The fading reaction accelerated with the increase of temperature. In the boiling water bath for 5 min, the maximum ΔA was reached, and the absorbance remained unchanged after flowing for 12 h. The maximum absorption wavelength of the solution was 555 nm. The detection limit of the method was 0.035 μg / L. Beer ’s law was obeyed when the change of absorbance and the concentration of Sn ranged from 0 to 1.0 μg / 50 m L. This method has been used to determine trace Sn in gangue.