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以玻碳电极为工作电极、pH 6.0的磷酸缓冲溶液为底液,研究了卤素离子氯离子、溴离子和碘离子对镉离子在此条件下电化学测定的影响.结果表明,3种卤素离子均能有效提高镉离子的响应电流.此外,当多种卤素离子同时存在时,镉离子的响应电流相对于单一卤素离子能进一步提高.进一步研究表明,卤素离子能吸附于电极表面,通过提高镉在电极表面电化学反应速度以及表面吸附量来提高镉离子的响应电流.
The effect of halide ion chloride ion, bromide ion and iodide ion on the electrochemical determination of cadmium ion was studied by using glassy carbon electrode as working electrode and pH 6.0 phosphate buffer solution as the bottom liquid. The results showed that three kinds of halide ions Which can effectively increase the response current of cadmium ions.In addition, when a variety of halogen ions coexist, the response current of cadmium ions can be further increased relative to a single halide ions.Further studies show that halogen ions can be adsorbed on the electrode surface, by increasing the cadmium Electrochemical reaction rate at the electrode surface and the amount of surface adsorption to improve the response current of cadmium ions.