【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。更多还原

【Abstract】 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.更多还原