Determination of Arsenic(III) Using Platinum Nanoparticle‐Modified Screen‐Printed Carbon‐Based Electrodes

Abstract

The electrochemical detection of arsenic(III) was investigated on platinum nanoparticle-modified carbon-based screen-printed electrodes (PtNPs/SPCEs) in 1 M aqueous H 2 SO 4 . PtNPs/SPCEs were prepared by electrochemical deposition of K 2 PtCl 6 . The resulting electrode surfaces were characterized with scanning electron microscopy (SEM). By using the As(III) oxidation peak for the analytical determination, there is no interference from Cu(II) if present in contrast to the other metal surfaces typically used for the detection of arsenic in electrochemistry. Precision of the proposed method was very good and a relative good accuracy determined by analysis of a certificate sample and in a spiked tap water sample. Electroinactive As(V) was reduced to As(III) by sodium thiosulfate prior to determination. The detection limit for As(III) obtained was 5.68 mg L À1. In terms of reproducibility, the precision of the above mentioned method in % RSD was calculated at 2.27%.

Anodic stripping voltammetric analysis of trace arsenic(III) enhanced by mild hydrogen-evolution at a bimetallic Au–Pt nanoparticle modified glassy carbon electrode

“…2C, under optimized conditions, the As (0) Fig. 2C) and those in many reported analogues [19,20], and the E cp is more positive than those reported previously even at comparable pH [21][22][23].…”

Multilayer assemblies of polyelectrolyte–gold nanoparticles for the electrocatalytic oxidation and detection of arsenic(III)

“…Furthermore, nano or microparticle based electrode materials are known to offer improved performances toward arsenic sensing [8,[15][16][17][18]. More distinctly, it has been shown that the use of platinum [8,17,18], iridium [15], and cobalt oxide [16] nanoparticles modified electrodes results in better sensitivity than platinum macroelectrodes for arsenic sensing, by method of direct oxidation of As(III) to As(V) in the 0.7-0.8 V (vs. SCE) potential range. However, these rather high potentials are close to the water decomposition potential and may also cause serious interferences in the analysis from other metallic and organic species.…”

Electrochemical determination of inorganic mercury and arsenic—A review

“…Platinum nanoparticles on screen printed electrodes (SPE) and boron doped diamond (BDD) electrodes were employed with detection limit of 5.68µg/L(Sanllorente-Méndez et al 2009) and 0.5µg/L(Hrapovic et al 2007) respectively. A detection limit of 0.1µg/L was achieved with platinum nanotube-array electrode(Xu et al 2008) Prakash et al, (2012).…”