基于聚三聚氰胺修饰电极应用于pH值测定的分析化学综合实验设计

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Comprehensive Experimental Design of Analytical Chemistry Based on the Application of Polyelamine-modified Electrodes in pHValue Determination

GU Hui CHEN Shu ZHANG Pei-sheng ZHOU Xiu-linYUE Ming* （School of Chemistryand Chemical Engineering，Hunan University of Science and Technology） Abstract：At present，analyticalchemistry experiments conducted incollegesanduniversities—includingclassical volumetric analytical experimentsand instrumentalanalysis experiments—aremostly confirmatory experiments. Theexperimental contents are relatively single，andthecultivation of the higher-order thinking of students has been ignored，which stuggles toenhance thestudents’investigativeandinnovativecapabilities.Thispaperintroducesan analyticalchemistry experiment derived fromasientificresearch achievement—theapplication of polymelaminemodified electrodes forpH measurement.Polymelamine contains abundant N=N double bonds，and can undergo electrochemical redox process at specific potentials，which requires the participation of the H+ ions in the solution. The Nernst potentialoftheredox peak potential generated by polymelamine changes withtheconcentrationof thesoluble H+ ions，which enables thequantitative detectionofpHvalueof the solution.Integrating classicalanalyticalmethods and modern instrumental analysis methods，this experiment features novel and comprehensive contents，which is conducive to cultivating students’higher-order thinking as wellas pioneeringand innovative abilities. Keywords：analytical chemistry experiment，comprehensive experiment，melamine，pH

0 引言

pH值（即酸碱度）是水质、健康、食品等的重要指标[1]。（剩余4685字）