固体石蜡碳糊硅钼酸电极的研制及应用  

Preparation of Carbon Paste Electrode With Paraffin as A Binder for the Potentiometric Determination of Silicon

作　　者：李建平[1] 刘碧波[1] 吴秉功[1] 

机构地区：[1]桂林工学院应用化学系,桂林541004

出　　处：《分析化学》1998年第3期279-282,共4页Chinese Journal of Analytical Chemistry

摘　　要：固体石蜡作粘合剂的碳糊电极在１０－４ｍｏｌ／Ｌ硅钼杂多酸溶液中活化后，其表面形成了杂多酸薄膜。电极对浓度为２．０×１０－５～１.０×１０－２ｍｏｌ／Ｌ范围的硅钼杂多酸有能斯特响应；斜率为２９．０ｍＶ，从而可间接测定硅。该电极选择性、稳定性较好，响应快，已用于矿泉水样中偏硅酸含量测定。A carbon paste electrode has been prepared with paraffin as a binder. When the electrode was immersed in 10-4 mol/L silicomolybdic heteropoly acid for 6-10 h, a chemical modified film was formed on the surface of electrode. A linear response was observed for silicomolybdic acid in the concentration range of 2×10-5~1×10-2 mol/L with a slope of 29.0 mV per decade, and the detection limit for the determination is 8.9×10-6 mol/L. The electrode is more sensitive, reproducible and stable than carbon paste electrode with paraffin oil as a binder. It has been used to the determination of trace soluble silicate in spring water with san factory results.

关 键 词：硅 测定 硅钼杂多酸 固体石蜡 碳糊电极 偏硅酸 

分 类 号：O613.72[理学—无机化学]