Carbon paste electrodes (CPE) as an electrochemical sensor has been fabricated using graphite powder and paraffin oil. The basic electrochemical parameters of the CPE electrode are characterized by cyclic voltammetry and electrochemical impedance spectroscopy (EIS). Potassium ferricyanide K₃[Fe(CN)₆] solutions as benchmark media to check redox reactions. Results illustrated that electron transfer to the electrode surface was diffusion controlled by both the techniques. The detection limits are 8×10^-5 M for K₃Fe(CN)₆ and 0.019 M for lead ion. The diffusion coefficient (D), no. of electron transfer, and charge transfer coefficient were also investigated.

中文翻译：

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碳糊电极用于重金属离子检测的电分析特性

碳糊电极（CPE）作为电化学传感器已使用石墨粉和石蜡油制造。CPE电极的基本电化学参数通过循环伏安法和电化学阻抗谱（EIS）进行表征。铁氰化钾K ₃ [Fe（CN）₆ ]溶液作为基准介质，以检查氧化还原反应。结果表明，通过这两种技术，电子转移到电极表面均受到扩散控制。K ₃ Fe（CN）₆的检出限为8×10 ^-5 M，铅离子的检出限为0.019M。扩散系数（D）还研究了电子转移的性质和电荷转移系数。