Yang Yuan-Fan, Song Zong-Yin, Liu Zi-Hao, Gao Zhi-Wei, Cai Xin, Huang Cong-Cong, Dai Pang-Da, Yang Meng, Li Pei-Hua, Chen Shi-Hua, Huang Xing-Jiu
Key Laboratory of Environmental Optics and Technology, And Environmental Materials and Pollution Control Laboratory, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China; Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China; Institute of Environmental Hefei Comprehensive National Science Center, Hefei, 230088, China; State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem, And Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China.
Key Laboratory of Environmental Optics and Technology, And Environmental Materials and Pollution Control Laboratory, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China.
Anal Chim Acta. 2024 Oct 9;1325:343121. doi: 10.1016/j.aca.2024.343121. Epub 2024 Aug 17.
Despite significant advancements in detecting Cd(II) using nanomaterials-modified sensitive interfaces, most detection methods rely solely on a single electrochemical stripping current to indicate concentration. This approach often overlooks potential inaccuracies caused by interference from coexisting ions. Therefore, establishing multi-dimensional signals that accurately reflect Cd(II) concentration in solution is crucial.
In this study, we developed a system integrating concentration, electrochemical stripping current, and laser-induced breakdown spectroscopy (LIBS) characteristic peak intensity through in-situ laser-induced breakdown spectroscopy and electrochemical integrated devices. By simultaneously acquiring multi-dimensional signals to dynamically track the electrochemical deposition and stripping processes, we observed that replacement reactions occur between Cu(II) and Cd(II) on the surface of Ru-doped MoS modified carbon paper electrodes (Ru-MoS/CP). These reactions facilitate the oxidation of Cd(0) to Cd(II) during the stripping process, significantly increasing the currents of Cd(II). Remarkably, the ingenious design of the Ru-MoS sensitive interface allowed for the undisturbed deposition of Cu(II) and Cd(II) during the electrochemical deposition process. Consequently, our in-situ integrated device achieved accurate detection of Cd(II) in complex environments, boasting a detection sensitivity of 8606.5 counts μM⁻.
By coupling multi-dimensional signals from stripping current and LIBS spectra, we revealed the interference process between Cu(II) and Cd(II), providing valuable insights for accurate electrochemical analysis of heavy metal ions in complex water environments.
尽管在使用纳米材料修饰的敏感界面检测镉（II）方面取得了重大进展，但大多数检测方法仅依靠单一的电化学溶出电流来指示浓度。这种方法常常忽略了共存离子干扰所导致的潜在误差。因此，建立能准确反映溶液中镉（II）浓度的多维信号至关重要。
在本研究中，我们通过原位激光诱导击穿光谱和电化学集成装置，开发了一种整合浓度、电化学溶出电流和激光诱导击穿光谱（LIBS）特征峰强度的系统。通过同时获取多维信号以动态跟踪电化学沉积和溶出过程，我们观察到在掺钌的二硫化钼修饰碳纸电极（Ru-MoS/CP）表面，铜（II）和镉（II）之间发生了置换反应。这些反应在溶出过程中促进了镉（0）氧化为镉（II），显著增加了镉（II）的电流。值得注意的是，Ru-MoS敏感界面的巧妙设计使得在电化学沉积过程中铜（II）和镉（II）能够不受干扰地沉积。因此，我们的原位集成装置实现了在复杂环境中对镉（II）的准确检测，检测灵敏度达到8606.5计数μM⁻¹。
通过耦合溶出电流和LIBS光谱的多维信号，我们揭示了铜（II）和镉（II）之间的干扰过程，为复杂水环境中重金属离子的准确电化学分析提供了有价值的见解。
