Abstract A Nickel Schiff base complex, insoluble in water, was synthesized and used as modifier. A Nickel Schiff base modified carbon paste electrode MCPE was build. The electrodes were characterized by scanning electron microscopy (SEM), energy dispersive X-Ray spectroscopy (EDXS), cyclic voltammetry and chronoamperometry. The modifier is elctroactive, a well defined redox couple of NiIII/NiII in alkaline medium was made in evidence. It presents a quasi-reversible system with electron transfer coefficient (0.38) and electron transfer rate of 4.5 s−1. The electrogenerated NiIII species on the surface of the electrode act as an excellent catalyst toward thiosulfate oxidation reaction with a chemical rate constant Kh equal to 23,6 M−1s−1. The different techniques involved in this study qualify our modified electrode as sensitive, reliable and very stable for thiosulfate analysis.

中文翻译：

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含五齿镍-(II)席夫碱配合物的碳糊电极的制备：在碱性介质中硫代硫酸盐电化学氧化中的应用

摘要 合成了一种不溶于水的镍席夫碱络合物，并将其用作改性剂。构建了镍席夫碱改性碳糊电极 MCPE。通过扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDXS)、循环伏安法和计时电流法对电极进行表征。改性剂是电活性的，在碱性介质中形成了明确定义的 NiIII/NiIII 氧化还原对。它呈现出电子转移系数 (0.38) 和电子转移速率 4.5 s-1 的准可逆系统。电极表面上的电生成 NiIII 物种作为硫代硫酸盐氧化反应的极好催化剂，化学速率常数 Kh 等于 23,6 M-1s-1。本研究中涉及的不同技术使我们的改良电极具有敏感性，