The present study introduced a novel ion-pair complex of [Co(5,5´-dmbpy)₃][Ce(NO₃)₆] (a1) fabricated by the reaction of Co(NO₃)₂·6H₂O, Ce(NO₃)₃·6H₂O, NaNO₃ and 5,5´-dimethyl-2,2´-bipyridine ligand. A sonochemical method was used to synthesize the nano-scale [Co(5,5´-dmbpy)₃][Ce(NO₃)₆] (a2). The sulfite was then detected and quantified on a carbon paste electrode (CPE) modified with ferrocene derivative and cobalt nanoparticles (Co-NPs). Scanning electron microscopy (SEM) and X-ray powder diffraction (XRD) were employed to characterize the Co-NPs. The results showed a significant improvement in the electrocatalytic activity and electro-active surface area following the CPE surface modification with the ferrocene derivative and Co-NPs. The voltammetric detection of sulfite was performed successfully by the as-fabricated sensor in real samples, with the linear dynamic range and the limit of detection of 0.07–440.0 and 0.03 µM, under optimal conditions, respectively.

本研究介绍了一种由Co(NO ₃ ) ₂ ·6H ₂ O反应制备的[Co(5,5´-dmbpy) ₃ ][Ce(NO ₃ ) ₆ ] (a1)的新型离子对络合物， Ce(NO ₃ ) ₃ ·6H ₂ O、NaNO ₃和 5,5´-二甲基-2,2´-联吡啶配体。采用声化学方法合成纳米级[Co(5,5´-dmbpy) ₃ ][Ce(NO ₃ ) ₆ ] (a2). 然后在用二茂铁衍生物和钴纳米粒子 (Co-NPs) 改性的碳糊电极 (CPE) 上检测和量化亚硫酸盐。扫描电子显微镜 (SEM) 和 X 射线粉末衍射 (XRD) 用于表征 Co-NPs。结果表明，在用二茂铁衍生物和 Co-NPs 进行 CPE 表面改性后，电催化活性和电活性表面积显着提高。所制备的传感器在实际样品中成功地进行了亚硫酸盐的伏安检测，在最佳条件下，线性动态范围和检测限分别为 0.07–440.0 和 0.03 µM。