Abstract
A new silver nanoparticle modified screen-printed electrode was developed and applied to the simultaneous determination of Pb(II) and Cu(II). Two different types of silver nanoparticles with different shapes and sizes, Ag nanoseeds and Ag nanoprisms, were microscopically characterized and three different carbon substrates, graphite, graphene and carbon nanofibers, were tested. The best analytical performance was achieved for the combination of Ag nanoseeds with a carbon nanofiber modified screen-printed electrode. The resulting sensor allowed the simultaneous determination of Pb(II) and Cu(II) at trace levels and its applicability to natural samples was successfully tested with a groundwater certified reference material, presenting high reproducibility and trueness.
Highlights
Voltammetric stripping techniques have been widely applied to trace metal ions determination because they present excellent detection limits, great sensitivity to the presence of different metals and capacity to multimetal determination with a relatively low cost [1]
The good properties of silver nanoparticles and the great features of screen-printed technology, in this work, we report for the first time the determination of Cu(II) with a silver-nanoparticle based- screen-printed electrode
The incorporation of Ag-NPs to commercially available screen-printed electrodes implies the increase of electrocatalytically active zones on the structure of the composite material
Summary
Voltammetric stripping techniques have been widely applied to trace metal ions determination because they present excellent detection limits, great sensitivity to the presence of different metals and capacity to multimetal determination with a relatively low cost [1]. For several decades, these techniques mainly used the hanging mercury drop electrode (HMDE) as a working electrode. BiFE, though, presents a narrower anodic potential range since the stripping peak of bismuth appears at −0.3 V This fact prevents the use of BiFE prepared via ex situ plating or preplated method to the determination of more oxidizable metals like Cu(II), whereas the in situ BiFE approach, where Bi(III) ions are electrochemically deposited
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