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.

中文翻译：

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同时采集剥离电流与激光诱导击穿光谱的多维信号耦合，用于精确分析共存 Cu(II) 中的 Cd(II)


尽管使用纳米材料修饰的敏感接口在检测 Cd(II) 方面取得了重大进展，但大多数检测方法仅依赖于单个电化学剥离电流来指示浓度。这种方法常常忽视由共存离子干扰引起的潜在误差。因此，建立准确反映溶液中Cd(II)浓度的多维信号至关重要。在这项研究中，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集成浓度、电化学剥离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来动态跟踪电化学沉积和剥离过程，我们观察到Ru掺杂MoS2修饰碳纸电极（Ru-MoS/ CP）。这些反应促进剥离过程中 Cd(0) 氧化为 Cd(II)，从而显着增加 Cd(II) 的电流。值得注意的是，Ru-MoS敏感界面的巧妙设计使得Cu(II)和Cd(II)在电化学沉积过程中能够不受干扰地沉积。因此，我们的原位集成装置实现了复杂环境下Cd(II)的精确检测，检测灵敏度达到8606.5 counts μM⁻。通过耦合剥离电流和LIBS光谱的多维信号，揭示了Cu(II)和Cd(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宝贵的见解。