异丙嗪-硅钼蓝分光光度法测定锅炉用水中硅含量的研究

On Determination of Silicon in Boiler Water by Spectrophotometry of Promethazine-Silicomolybdic Blue Method

采用药用异丙嗪溶液作为钼蓝法中新还原剂,在0.4mol/L HCl介质中,异丙嗪与硅钼杂多酸反应生成杂多蓝,用标准曲线法测定锅炉用水中的硅含量。实验结果表明,硅含量在0.1～2.5μg.mL-1范围内符合朗伯-比尔定律,λmax=801nm,摩尔吸光系数为5.4×104L.mol-1 cm-1,标准曲线的一元线性方程为A=0.47272C+2.73×10-3,r值为0.99997。异丙嗪作还原剂具有还原速度快,产物稳定性好。该法选择性好、灵敏度搞、测量误差小,操作简便的特点。

A reducing agent of medicinal promethazine is used for the determination of silicon content in boiler water by silicomolybdic blue method.In the medium of HCl of 0.4mol/ L,the reducing agent reacts with heteropoly acid of silicon to form heteropoly blue with λmax=801nm.Absorptivity is 5.4×104L· mol-1cm-1.Lambert-Beer law is obeyed in the range of 0.1～2.5μg/m L for for silicon.By the standard curve,the expression is established,A=0.47272C＋2.73×10-3,r=0.99997.The rate of the reaction is fast,and the reaction product is stable.This method is used for the determination of silicon with a good selectivity,a high sensivity,less error,and easy and fast operation.