基于钼的磷酸根离子选择电极表面反应过程研究

Study on Surface Reaction Process of Phosphate Ion Selective Electrode Based on Molybdenum

为研究基于钼的磷酸根离子选择电极测量原理,探究电极表面钼的价态和不同氢氧根离子(OH-)浓度对磷酸盐检测体系的影响,采用循环伏安法对钼电极检测磷酸盐时的表面反应机理进行定性研究分析,同时利用能谱法进行定量分析。研究结果显示,检测磷酸盐时钼电极表面反应的产物为三氧化钼(MoO 3);碱性环境是形成MoO 3并最终基于钼的磷酸根离子选择电极能够检测磷酸盐的必要条件。

In order to study the measurement principle of the phosphate ion selective electrode based on molybdenum,the influence of molybdenum valence state and different hydroxide ions(OH-)concentration on the phosphate detection system was studied,the surface reaction mechanism of the detection of phosphate by molybdenum electrode was qualitatively analyzed by cyclic voltammetry,and the energy spectrum method was used for quantitative analysis.The results show that molybdenum trioxide(MoO 3)is the product of the surface reaction of molybdenum electrode in the detection of phosphate.Alkaline environment is the necessary condition for the formation of MoO 3 and the final realization of phosphate ion selective electrode based on molybdenum for phosphate detection.