一种测定高酸度水溶液有效酸度的固态电化学传感器

A Solid-State Electrochemical Sensor for Determination of Effective Acidity of Aqueous Solutions with High Acidity

以循环伏安法在石墨电极表面电聚合制备了新型全固态邻氨基酚-邻苯二胺共聚物薄膜修饰电极,采用循环伏安法研究了此电极在H^+的有效浓度为1.00×10^(12)~10.0 mol/L范围内的电化学响应,结果表明,还原峰电位与溶液的有效酸度分别在1.00×10^(10)~0.10 mol/L、0.10~2.00 mol/L和2.00~10.0 mol/L 3段浓度范围内呈良好的线性响应,线性回归方程分别为E_(pc)=0.0456lg C(H^+)-0.295,E_(pc)=0.0803C(H^+)-0.309,E_(pc)=0.0278C(H^+)-0.188。在有效酸度为1.00~8.00 mol/L的H_2SO_4、HNO_3或者HCl O_4溶液中亦有类似的线性响应。此电极制备方法简单,酸度测试范围宽至1.00×10^(10)~10.0 mol/L,为开发新型高酸度固态电化学传感器奠定了基础。

A new all-solid state electrode modified with poly(o-aminophenol-co-o-phenylenediamine)film was prepared by cyclic voltammetry.The electrochemical response of the electrode to various solutions in the available acidity range of1.00×10-12-10.0mol/L was studied by cyclic voltammetry.The results showed that the reduction peak potentials and the available acidity of solution showed good linear relationship in3stages of1.00×10-10-0.10mol/L,0.10-2.00mol/L and2.00-10.0mol/L respectively,and the regression equations were Epc=0.0456lgC(H+)-0.295,Epc=0.0803c(H+)-0.309,and Epc=0.0278c(H+)-0.188,respectively.There were similar responses in the solutions of H2SO4,HNO3and HClO4in the concentrationrange of1.00-8.00mol/L.The preparation method of electrode was simple,and the determination range ofavailable acidity was as wide as1.0伊10-10-10.0mol/L,which laid the foundation for the development ofsolid-state electrochemical sensors for determination of acidity of high acidity solution.