Karapa Alexandra, Kokkinos Christos, Fielden Peter R, Baldock Sara J, Goddard Nickolas J, Economou Anastasios
Department of Chemistry, National and Kapodistrian University of Athens, Athens, 157 71, Greece.
Department of Chemistry, Lancaster University, Lancaster, LA1 4YB, UK.
Talanta. 2023 Dec 1;265:124850. doi: 10.1016/j.talanta.2023.124850. Epub 2023 Jun 20.
Mercury is a toxic environmental contaminant that can cause serious health problems. This work describes a new type of eco-friendly three-electrode plastic sensor chip for the determination of trace Hg(II) by means of anodic stripping voltammetry (ASV). The sensor chip is entirely fabricated by injection moulding, which is a sustainable manufacturing method, and consists of three conductive carbon-based electrodes embedded in a plastic holder while the reference electrode is coated with Ag using e-beam evaporation. The sample is spiked with Au(III) which deposits on the working electrode in the form of gold nanoparicles during the analysis; the target Hg(II) co-deposits on the gold nanoparticles forming a Au(Hg) amalgam in situ. The accumulated Hg is stripped off the electrode and quantified by an anodic square wave potential scan. The relevant conditions and the potential interferences are investigated. The limit of detection for Hg(II) is 0.4 μg L and the repeatability at the 20 μg L Hg(III) level (n = 10) is 5.3%. The sensor is applied to water, honey, fish oil and mussel samples with recoveries between 98 and 107%.
汞是一种有毒的环境污染物，会导致严重的健康问题。这项工作描述了一种新型的环保型三电极塑料传感器芯片，用于通过阳极溶出伏安法（ASV）测定痕量Hg(II)。该传感器芯片完全通过注塑成型制造，这是一种可持续的制造方法，由嵌入塑料支架中的三个导电碳基电极组成，而参比电极通过电子束蒸发涂覆Ag。样品中加入Au(III)，在分析过程中Au(III)以金纳米颗粒的形式沉积在工作电极上；目标Hg(II)在金纳米颗粒上共沉积，原位形成Au(Hg)汞齐。积累的Hg从电极上溶出，并通过阳极方波电位扫描进行定量。研究了相关条件和潜在干扰。Hg(II)的检测限为0.4 μg/L，在20 μg/L Hg(III)水平（n = 10）下的重复性为5.3%。该传感器应用于水、蜂蜜、鱼油和贻贝样品，回收率在98%至107%之间。
