测定水中硅的新还原剂——赤霉素－葡萄糖－二氯化锡混合液

摘要

A suitable reducing agent of the mixture of gibberellin, glucose and tin dichloride was used as a new color reagent for the determination of silicon content in water by silicomolybdic blue method. In the medium of HNO3 of 0.2 mol/L, the mixture of gibberellin, glucose and tin dichloride reacts with hete-ropoly acid of silicon to form heteropoly blue with λ max=801 nm . Apparent molar absorptivity is 1.28× 104 L· mol-1· cm-1 . Lambert-Beer law is obeyed in the range of 0.1～ 4 mg/L for silicon. The rate of this reaction is fast, and the reaction product is stable. This method has been used to determine silicon content in mineral water with satisfactory results.%采用赤霉素－葡萄糖－二氯化锡混合液作为钼蓝法中的新还原剂。在 0.2 mol/L HNO3介质中 , 赤霉素－葡萄糖－二氯化锡混合物与硅杂多酸反应生成杂多蓝。λ max=801 nm, 表观摩尔吸光系数为 1.28× 104 L· mol－ 1· cm－ 1, 硅含量在 0.1～ 4 mg/L范围内符合朗伯－比尔定律。以赤霉素－葡萄糖－二氯化锡混合液作还原剂，还原速度快，产物稳定性好，操作简便，结果令人满意。