Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, Berdychowo 4, 60-965, Poznan, Poland.
Department of Chemical Technology, Poznan University of Technology, ul. Berdychowo 4, 60-965, Poznan, Poland.
Mikrochim Acta. 2021 Jan 27;188(2):54. doi: 10.1007/s00604-021-04713-4.
An electrochemical sensor was fabricated utilizing ionic liquids possessing cations with long alkyl chains such as trimethyl octadecylammonium and behenyl trimethylammonium and ascorbate anion. The ionic liquids were drop-coated onto the electrode. Thin modifying layers were prepared. Cyclic voltammetric investigations revealed electrostatic interactions between the electrochemical probes and the modified surface, proving that a positive charge was established at the film surface. Hence, negatively charged species such as nitrite can be pre-concentrated on the surface of presented modified electrodes. The fabricated electrodes have been used as a voltammetric sensor for nitrite. Due to the electrostatic accumulation properties of long alkyl cation, the assay exhibits a remarkable improvement in the voltammetric response toward nitrite oxidation. The influence of pH on the electrode response was thoroughly investigated, and the mechanism of the electrode was established. The developed sensor showed a linear electrochemical response in the range 1.0-50 μM with a detection limit of 0.1 μM. The electrode revealed good storage stability, reproducibility, and anti-interference ability. The determination of nitrite performed in curing salts brought satisfactory results.
采用具有长烷基链的阳离子（如三甲基十八烷基铵和二十二烷基三甲基铵）和抗坏血酸阴离子的离子液体，制备了电化学传感器。将离子液体滴涂在电极上，制备了薄的修饰层。循环伏安研究表明电化学探针与修饰表面之间存在静电相互作用，证明在膜表面建立了正电荷。因此，带负电荷的物质，如亚硝酸盐，可以在呈现的修饰电极表面上进行预浓缩。所制备的电极已用作亚硝酸盐的伏安传感器。由于长烷基阳离子的静电积累特性，该测定法在亚硝酸盐氧化的伏安响应方面表现出显著改善。彻底研究了 pH 对电极响应的影响，并建立了电极的机制。所开发的传感器在 1.0-50 μM 范围内表现出线性电化学响应，检测限为 0.1 μM。电极显示出良好的储存稳定性、重现性和抗干扰能力。在固化盐中进行的亚硝酸盐测定取得了令人满意的结果。
