Citation: ZHOU Shuang, GUO Yu-Shi, YAN Yu, QU Jiang-Ying, HE Chun-Xiang. A Solid-State Electrochemical Sensor for Determination of Effective Acidity of Aqueous Solutions with High Acidity. Chinese Journal of Analytical Chemistry, 2018, 46(1): 81-87. doi: 10.11895/j.issn.0253-3820.171088 [复制]
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Epc＝0.0456lgC（H+）-0.295，Epc＝0.0803C（H+）-0.309，Epc＝0.0278C（H+）-0.188。在有效酸度为1.00~8.00 mol/L的H2SO4、HNO3或者HClO4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 of 1.00×10-12-10.0 mol/L was studied by cyclic voltammetry. The results showed that the reduction peak potentials and the available acidity of solution showed good linear relationship in 3 stages of 1.00×10-10-0.10 mol/L, 0.10-2.00 mol/L and 2.00-10.0 mol/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, HNO3 and HClO4 in the concentration range of 1.00-8.00 mol/L. The preparation method of electrode was simple, and the determination range of available acidity was as wide as 1.0×10-10-10.0 mol/L, which laid the foundation for the development of solid-state electrochemical sensors for determination of acidity of high acidity solution.
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