Institute of Intelligent Machines and Key Laboratory of Environmental Optics and Technology , Chinese Academy of Sciences , Hefei , Anhui 230031 , People's Republic of China.
Department of Chemistry , University of Science and Technology of China , Hefei , Anhui 230031 , People's Republic of China.
Anal Chem. 2019 Aug 6;91(15):9978-9985. doi: 10.1021/acs.analchem.9b01724. Epub 2019 Jul 10.
Although it has been recognized that the interference between heavy metal ions (HMIs) becomes a severe problem for the simultaneous electroanalysis of multiple HMIs, the factor leading to the interference is still difficult to identify, due to the limited understanding of the electroanalytic kinetics. In this work, a kinetic model is built for the electroanalysis of HMIs, and the electroanalytic results are simulated for Cd(II), Cu(II), and their mixture as examples for the interference investigation. The mutual interference between Cd and Cu is observed on the glassy carbon electrode. By applying the kinetic model, the replacement of deposited Cd by Cu(II) at the codeposition stage is regarded as the main reason for the interference, and the corresponding suggestion for selecting suitable electrode materials to avoid such interference is also provided.
尽管已经认识到重金属离子（HMIs）之间的干扰成为同时分析多种 HMIs 的严重问题，但由于对电分析动力学的理解有限，导致难以确定干扰的因素。在这项工作中，建立了用于 HMIs 电分析的动力学模型，并以 Cd(II)、Cu(II)及其混合物为例对电分析结果进行了模拟，以研究干扰。在玻碳电极上观察到 Cd 和 Cu 之间的相互干扰。通过应用动力学模型，将共沉积阶段沉积的 Cd 被 Cu(II)取代视为干扰的主要原因，并提供了选择合适电极材料以避免这种干扰的建议。
