Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, National Demonstration Center for Experimental Chemistry Education, College of Chemistry & Material Science, Northwest University, Xi'an 710127, China.
Analyst. 2021 Jan 21;146(2):691-697. doi: 10.1039/d0an01861a. Epub 2020 Nov 19.
A portable electrode with usability, availability, and high-sensitivity is of great significance for effective on-site detection in practical situations. In this paper, a novel flexible, disposable sensor for Cd and Pb with ultrahigh sensitivity and a fast response, based on acid-etched Fe/FeO encapsulated into a disposable carbon cloth electrode, has been successfully fabricated. Differential pulse anode stripping voltammetry (DPASV) was used to investigate the stripping behavior of Cd and Pb, achieving high sensitivity for Cd and Pb (338.7 and 408.0 μA mM cm) with limits of detection (LODs) of 0.42 ppb and 0.50 ppb, respectively. Meanwhile, remarkable stability and reproducibility were obtained. Such an electrode can detect Cd and Pb in actual water samples so this is a good candidate to act as a simple and convenient sensor for general applications. More importantly, the novel disposable electrode exhibited the unique advantages of convenience, portability, and reliability compared to a conventional electrode, which may make it an alternative advantageous choice for practical on-site detection.
一种具有易用性、可用性和高灵敏度的便携式电极对于实际情况下的有效现场检测具有重要意义。本文成功制备了一种基于酸刻蚀的 Fe/FeO 封装到一次性碳布电极中的新型、灵活、一次性传感器，用于超灵敏、快速响应的 Cd 和 Pb 检测。差分脉冲阳极溶出伏安法 (DPASV) 用于研究 Cd 和 Pb 的溶出行为，实现了对 Cd 和 Pb 的高灵敏度（Cd 和 Pb 的灵敏度分别为 338.7 和 408.0 μA mM cm，检测限（LOD）分别为 0.42 ppb 和 0.50 ppb）。同时，还获得了显著的稳定性和重现性。该电极可用于实际水样中 Cd 和 Pb 的检测，因此是一种适用于一般应用的简单方便的传感器的良好候选者。更重要的是，与传统电极相比，新型一次性电极具有便利性、便携性和可靠性等独特优势，这使其可能成为实际现场检测的另一种有利选择。
