Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Gold nanoparticle-modified sustainable plastic sensor chip for voltammetric monitoring of Hg(II)
AU - Karapa, Alexandra
AU - Kokkinos, Christos
AU - Fielden, Peter R
AU - Baldock, Sara J
AU - Goddard, Nickolas J
AU - Economou, Anastasios
PY - 2023/12/1
Y1 - 2023/12/1
N2 - 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%. [Abstract copyright: Copyright © 2023 Elsevier B.V. All rights reserved.]
AB - 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%. [Abstract copyright: Copyright © 2023 Elsevier B.V. All rights reserved.]
KW - Anodic stripping voltammetry
KW - Mercury
KW - Integrated sensor
KW - Injection-moulding
KW - Plastic electrodes
U2 - 10.1016/j.talanta.2023.124850
DO - 10.1016/j.talanta.2023.124850
M3 - Journal article
C2 - 37354623
VL - 265
JO - Talanta
JF - Talanta
SN - 1873-3573
M1 - 124850
ER -