Zhang Mengqi, Zou Yanqi, Zhou Xiaoyu, Yan Fei, Ding Zhanling
Guangxi Medical University Cancer Hospital, Nanning, China.
Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou, China.
Front Chem. 2022 Jun 29;10:952936. doi: 10.3389/fchem.2022.952936. eCollection 2022.
Rapid and simple determination of mercury ion (Hg) in pharmaceuticals and soil samples is vital for human health and the environmental monitoring. Vertically-ordered mesoporous silica films (VMSF) supported by the indium tin oxide (ITO) electrode surface were prepared by electrochemically assisted self-assembly method and utilized for electrochemical detection of Hg. Owing to the negatively charged channel walls and ultrasmall pore diameter, VMSF displays obvious cationic selectivity and has highly electrostatic interaction for Hg, giving rise to the strong electrochemical signals. By recording the anodic stripping signals of adsorbed Hg using differential pulse voltammetry, quantitative detection of Hg was achieved with a wide linear range (0.2 μM-20 μM) and a low limit of detection (3 nM). Furthermore, considering the anti-fouling and anti-interference capacity of VMSF, the proposed VMSF/ITO sensor has been successfully applied to detect Hg in pharmaceuticals and soil samples without tedious pretreatment processes of samples.
快速、简单地测定药品和土壤样品中的汞离子（Hg）对于人类健康和环境监测至关重要。通过电化学辅助自组装方法制备了由氧化铟锡（ITO）电极表面支撑的垂直有序介孔二氧化硅薄膜（VMSF），并将其用于Hg的电化学检测。由于带负电荷的孔壁和超小的孔径，VMSF表现出明显的阳离子选择性，并且对Hg具有高度的静电相互作用，从而产生强烈的电化学信号。通过使用差分脉冲伏安法记录吸附Hg的阳极溶出信号，实现了Hg的定量检测，线性范围宽（0.2 μM - 20 μM），检测限低（3 nM）。此外，考虑到VMSF的抗污和抗干扰能力，所提出的VMSF/ITO传感器已成功应用于检测药品和土壤样品中的Hg，而无需对样品进行繁琐的预处理过程。
