Electrochemical Determination of Arsenic Using Silver Nanoparticles

Abstract

In the present work, silver colloid was produced by chemical reduction of silver salt (silver nitrate) using citrates in aqueous solution. UV‐Vis spectrophotometry indicated the formation of nanoparticles. The surface plasmon resonance peak in absorption spectra of the silver colloidal solution showed an absorption maximum at 435 nm. The dynamic light scattering and zeta potential measurements showed that the size and the zeta potential of the synthesized nanoparticles were about 98 nm and −50 mV respectively. The nanoparticles have been used to modify the gold electrode for use as a potential electrochemical sensor for the analysis of arsenic in aqueous solution. The cyclic voltammogram recorded using gold electrode modified with AgNPs depicted a well‐defined reduction peak of arsenic compared to bare gold electrode. The enhancement of the signal is essentially due to the large surface area attributed to silver nanoparticles. Linear sweep voltammetry has been used to optimize the analytical conditions of arsenic in aqueous solution: it came out that the detection of arsenic in 0.1 M HNO3 was optimal while the electrode was conditioned at −0.6 v during 300 s. Under these optimum conditions, a calibration curve was plotted in the concentration range of 0.05 μM to 0.2 μM and the detection limit was estimated at 1.38×10−8 M, calculated from a ratio signal/noise 3.

Adsorption of Bovine Serum Albumin on Silver Nanoparticle Layer Deposited on Mercaptohexylpyridinium‐Coated Quartz Crystal Microbalance with Dissipation Gold Electrode: Studied by Electrochemical Quartz Crystal Microbalance with Dissipation

“…The decreased charge during the CV cycling could be explained by some loss of Ag atoms from the surface, probably in the form of AgCl, or loss of electronic contact between Ag/AgCl and the gold surface, during the CV‐based oxidation/reduction of Ag/AgCl, respectively. Giovanni and Pumera and Ruzgas et al have also observed that charges involved during electrochemistry of AgNPs were decreasing, whereas the number of scans was increasing.…”

Advances in Electrochemical Detection Electrodes for As(III)

“…Baudelaire Matangouo Sonkoue generated silver nanocolloids by the chemical reduction of silver salts using citrate in aqueous solution and used a gold electrode modified with silver nanoparticles as the working electrode in linear sweep voltammetry for the detection of arsenic ions. Under optimal conditions, calibration curves were plotted over a concentration range of 0.05–0.2 μM and the limit of detection was estimated to be 13.8 nM [ 112 ]. In addition, composites of silver nanomaterials with chitosan and graphene are also of interest for the electrochemical detection of arsenic.…”

Synthesis and sensing efficiency of CN-wrapped ZnFe2O4 microsphere–ionic liquid composites towards ultra-high sensitive arsenic(iii) monitoring of ground drinking water

“…Among these metal ions Cu (II) is the major interfering agent because of the formation of intermetallic Cu3As2 species that generate competition for adsorption against As(III). 24 Thus, we analyzed the impact of Cu(II) on the electrochemical sensing efficiency of the CN@ZF-Ms-IL electrode using SWASV under optimized conditions. Figure 4A shows the stripping peak current response of CN@ZF-Ms-IL towards 10 ppb of As(III) in the presence of increasing concentration (20-60 ppb) of Cu(II).…”