Gold Nanoparticle Modified Electrodes Show a Reduced Interference by Cu(II) in the Detection of As(III) Using Anodic Stripping Voltammetry

Abstract

Interference by Cu(II) causes serious problems in the detection of As(III) using anodic stripping voltammetry at gold electrodes. The behavior of Cu(II) and As(III) were examined at both a gold macro electrode and two kinds of gold nanoparticle modified electrodes, one where gold particles are deposited on glassy carbon (GC) and the other where basal plane pyrolytic graphite (BPPG) is the substrate. The sensitivity of As(III) detection was higher on gold nanoparticle modified electrodes than those on a macro gold electrode by up to an order of magnitude. In addition, the stripping peak of As(III) was narrower and more symmetric on a gold nanoparticle-modified GC electrode, leading to analytical data with a lower limit of detection. At a macro gold electrode, the peak currents of Cu(II) were higher than those on gold nanoparticle modified electrodes. Accordingly, through the use of gold nanoparticle modified electrodes, the effect of copper interference to the arsenic detection can be reduced.

The Influence of Electrode Porosity on Diffusional Cyclic Voltammetry

“…In such a situation the concentration profile of species A may be simulated independently from that of species B [14].…”

Electrochemical Deposition of Gold Nanoparticles on Pencil Graphite by Fast Scan Cyclic Voltammetry

“…31 Dai et al have reported the synthesis of AuNPs by applying a potential step on the GC electrode immersed in acidic AuCl 4 -solution in order to use nanoparticles for the determination of As(III). 32 For this work, pencil graphite (PG) was chosen as the disposable carbon based substrate owing to its availability and cost-effectiveness. It has been used as a sorbent in solidphase microextraction of alcohols, 33 as a substrate to study nucleation mechanisms 34 and for coating polymer films by electropolymerization 35 and as an electrode for electrodeposition metals for analytic and catalytic purposes.…”

Anodic Stripping Voltammetric Detection of Arsenic(III) at Platinum-Iron(III) Nanoparticle Modified Carbon Nanotube on Glassy Carbon Electrode

“…Examples are Au-nanoparticle modified glassy carbon electrode (GCE), [12][13][14] Au modified boron doped diamond (BDD) electrode, 15,16 Au nanoparticle modified carbon nanotubes or carbon microspheres [17][18][19] and Au nanoelectrode ensembles. 20 Among other methods are silver electrode, 21 Platinum (Pt) nanoparticle modified GCE, 22 Pt nanotube, 23 Pt modified BDD electrode, 24 Iridium-implanted BDD electrode, 25 arsenite oxidase biosensor, 26 screen printed ring disk carbon electrode, 27 and cobalt oxide nanoparticle modified GCE.…”