Chen Xiaohui, Sun Yufa, Wang Wenchang, Chen Zhidong, Ming Zhiyao
School of Chemistry and Material Engineering, Changzhou Institute of Technology, Changzhou, 213032, People's Republic of China.
School of Petrochemical and Engineering, Changzhou University, Changzhou, 213164, People's Republic of China.
Anal Sci. 2023 Sep;39(9):1465-1473. doi: 10.1007/s44211-023-00358-w. Epub 2023 Jun 6.
The presence of cuprous ions in the copper-dissolving solution significantly affects the microstructure of copper plated surface. Fewer quantitative analyses of cuprous ions in the copper foil productive process had rarely been involved so far. In the present work, a novel electrochemical sensor of the bathocuproine (BCP) modified expanded graphite (EG) electrode was developed for the selective determination of cuprous ions. EG has a large surface area, good adsorption, and excellent electrochemical performance which remarkably promoted analytical sensitivity. Meanwhile, the selective determination of the BCP-EG electrode for cuprous ions in the coexistence of ten thousand times of copper ions have been achieved on the benefit of the special coordination of BCP to cuprous ions. In the coexistence of 50 g/L copper ions, the analytical performance of the BCP-EG electrode for the determination of cuprous ions had been examined. The results represented a wide detection range of cuprous ions in the range of 1.0 μg/L-5.0 mg/L, with a low detection limit of 0.18 μg/L (S/N = 3) and the BCP-EG electrode has great selectivity to cuprous ions in presence of various interferences. The analytical selectively for cuprous ions supported by the proposed electrode would be a potential analytical tool for quality improvement in electrolytic copper foil manufacturing.
溶解铜溶液中铜离子的存在显著影响镀铜表面的微观结构。到目前为止，在铜箔生产过程中对亚铜离子的定量分析较少涉及。在本工作中，开发了一种新型的基于 bathocuproine（BCP）修饰膨胀石墨（EG）电极的电化学传感器，用于选择性测定亚铜离子。EG 具有大表面积、良好的吸附性和优异的电化学性能，显著提高了分析灵敏度。同时，由于 BCP 与亚铜离子的特殊配位作用，实现了 BCP-EG 电极在存在万倍铜离子的情况下对亚铜离子的选择性测定。在存在 50 g/L 铜离子的情况下，考察了 BCP-EG 电极测定亚铜离子的分析性能。结果表明，亚铜离子的检测范围为 1.0 μg/L - 5.0 mg/L，检测限低至 0.18 μg/L（S/N = 3），并且 BCP-EG 电极在存在各种干扰的情况下对亚铜离子具有很大的选择性。所提出的电极对亚铜离子的分析选择性将成为改善电解铜箔制造质量的潜在分析工具。
