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测量人们所关心的糖精含量的糖精电极已有数种,但应用油/水界面电分析化学技术研究其响应机理尚无报导。本文采用电流扫描极谱法对糖精在水/1,2—二氯乙烷界面上的迁移行为进行研究,探讨糖精电极的响应机理问题,这样可为进一步改进糖精电极的性能提供一定的理论依据,并预测可用乙基紫—糖精缔合物作为糖精电极的电活性物质。 1 实验部分 1.1 仪器与试剂 DSJP—1型电流扫描极谱仪(武汉市电工仪器厂),3086型x-y函数记录仪(四川仪表四厂),四电极系统电解池同文献。水相支持电解质为1mol/LMgSO_4,有机相溶剂为DCE(1,2-二氯乙烷),支持电解质为0.05mol/L EV~+TPB~-(乙基紫四苯硼酸盐),其制备方法如下:称取等摩尔比的EV~+Cl~-和Na~+TPB~-,分别溶于甲醇中,混合,生成EV~+TPB~-沉淀,抽滤,用甲醇洗涤3～4
There are several types of saccharin electrodes for measuring the saccharin content of interest, but there is no report about the response mechanism of the saccharin electrode using oil / water interface analysis chemistry. In this paper, the current sweep polarography was used to study the migration of saccharin at the water / 1,2-dichloroethane interface, and to explore the response mechanism of saccharin electrode, which could provide some theoretical basis for further improving the performance of saccharin electrode , And it is predicted that Ethyl Violet-Saccharin Complex can be used as the electroactive substance of saccharin electrode. 1 Experimental 1.1 Instruments and reagents DSJP-1 current scanning polarography (Wuhan Electrical Instrument Factory), 3086 x-y function recorder (Sichuan Instrument Factory), four-electrode system with the same electrolytic cell. The supporting electrolyte in aqueous phase was 1 mol / L MgSO 4, the organic phase solvent was DCE (1,2-dichloroethane), the supporting electrolyte was 0.05 mol / L EV + TPB ~ - The preparation method is as follows: equimolar ratios of EV ~ + Cl ~ - and Na ~ + TPB ~ - are respectively dissolved in methanol and mixed to form EV ~ + TPB ~ -precipitate, suction filtered and washed with methanol for 3-4