【摘要】 采用石墨烯修饰电极,建立一种电化学检测食盐中碘的新方法。石墨烯修饰电极通过一步电化学沉积法将胶体水溶液中的氧化石墨烯沉积到电极表面制得。考察了电极浸泡时间和溶液pH对碘离子测定的影响。在最佳的实验条件下,采用方波伏安法研究了石墨烯修饰电极对碘离子的响应性能。研究结果表明碘离子的氧化峰电流随碘离子浓度在1×10-7至1×10-2 mol·L-1范围内增加而不断增大,且氧化峰电流的对数与碘离子浓度的对数在5×10-6至1×10-2 mol·L-1浓度范围内具有良好的线性关系。建立的方法具有良好的选择性和重现性,检出限为5×10-6 mol·L-1。在此基础上,将该修饰电极用于食盐中碘的测定。更多还原

【Abstract】 Here we report a novel method for electrochemical detection of iodide based on graphene modified electrode.In this method,the graphene modified electrode was fabricated by one-step electrochemical deposition of graphene oxide from its colloidal aqueous solution.The effect of measurement conditions including electrode immersion time and solution pH on the performance of the modified electrode was investigated.Under the optimized conditions,the analytical performances of the proposed electrode for detection of iodide were evaluated by square wave voltammetry.Our results showed that the oxidization peak current of iodide increased with its increasing concentration in the range of 1×10-7 to1×10-2 mol L-1,and a good linear logarithmic plot between the oxidization peak current and iodide concentration was obtained in the concentration range of 5×10-6 to 1×10-2 mol·L-1.The proposed method had good selectivity and reproducibility with a limit of detection of 5×10-6 mol·L-1.Furthermore,the modified electrode was employed for detection of iodide in table salt.更多还原