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两个不可逆电对共存体系的流动注射双安培分析法

宋俊峰;赵川;亢晓峰;过玮

  Flow injection biamperometry was extended to irreversible couple systems. For the biamperometry, the essential condition is the coexistence of two reactants, with opposite electrode reaction, of two independent and irreversible couples in the same system. The system can be skillfully constructed with analyte by choosing such a reactant of one couple as its standard redox potential which was better closed to that of the analyte as nearly as possible. In the chosen system, provided the real potentials of the two working electrodes have exceeded the deposition potential of two reactants by imposing a suitable potential difference ΔEbetween these two electrodes, faradic currentiwill flow through circuit. When the concentration of the chosen reactant remains larger constant, the circuit currentiwill be linearly proportional to the analyte of interest over certain concentration range. To verify the feasibility of the biamperometry, three systems of the dissolved oxygen separately with ascorbic acid, hydrazine chloride and hydroxyamine chloride were examed. In phosphate buffer(pH 6.9) solution containing the dissolved oxygen, using two activated platinum wire working electrodes imposed by potential difference ΔE00 V, the circuit currentiwas linearly proportional to these three analytes in the concentration range of 1×10-5—1×10-3mol/L for ascorbic acid,1×10-6—1×10-4mol/L for hydrazine chloride and hydroxyamine chloride, respectively.[WT5HZ]……   
[关键词]:双安培法;流动注射分析;不可逆电对
[文献类型]:期刊
[文献出处]: 《高等学校化学学报2000年04期
[格式]:PDF原版; EPUB自适应版(需下载客户端)