Direct As(V) Determination Using Screen-Printed Electrodes Modified with Silver Nanoparticles

Abstract

<jats:p>Carbon-nanofiber-based screen-printed electrodes modified with silver nanoparticles (Ag-NP-SPCNFEs) were tested in a pioneering manner for the direct determination of As(V) at low μg L−1 levels by means of differential pulse anodic stripping voltammetry. Screen-printed electrodes were modified with two different types of Ag-NPs, nanoseeds (NS), and nanoprisms (NPr) and characterized both microscopically and electrochemically. Furthermore, after optimizing the direct voltammetric determination of As(V), the analytical performance of considered sensors was compared for the direct determination of As(V). These results suggest that Ag-NS offer a better analytical response compared to Ag-NPr, with a detection and quantification limit of 0.6 and 1.9 µg L−1, respectively. The proposed methodology was validated using a spiked tap water sample with a very high reproducibility and good agreement with inductively coupled plasma - mass spectrometry (ICP-MS) measurements.</jats:p>

Recent Trends in the Improvement of the Electrochemical Response of Screen-Printed Electrodes by Their Modification with Shaped Metal Nanoparticles

“…In addition, triangular-shaped nanoparticles were synthesized for the voltammetric determination of heavy metal ions. Torres-Rivero et al [ 5 , 42 ] synthesized silver nanoparticles (Ag-nanoseeds and Ag-nanoprisms) by the seed mediated approach [ 84 , 85 ]. SEM and TEM images showed that the Ag-nanoprisms had triangular morphology with a size between 14.25 and 16.46 nm ( Figure 5 A).…”

“…In a previous study, the Pb(II) and Cd(II) ions were determined in an acetic acid/acetate buffer [ 5 ]. In contrast, in another investigation, As(V) ions were detected in a HCl electrolyte [ 42 ] using the differential pulse anodic stripping voltammetry technique.…”

“… ( A ) SEM micrograph of AgNPr (800 µL of Ag Seeds solution). ( B ) Differential pulse anodic stripping voltammograms of As(V) and its calibration plot in 0.01 mol L −1 pH 2 applying −1.30 V and a deposition time of 120 s. Reproduced with permission of Torres-Rivero et al, Nanomaterials; published by MDPI, 2020 [ 42 ]. …”

Customized Screen-Printed Electrodes Based on Ag-Nanoseeds for Enhanced Electroanalytical Response towards Cd(II), Pb(II) and As(V) in Aqueous Samples

“…In particular, electrochemical sensors represent a versatile tool for monitoring different samples in the environmental field. In addition, the literature has reported how modifying their surface with nanomaterials enhanced the electrochemical reactivity and sensitivity to specific analytes [9], allowing lower detection limits and higher sensitivity for stripping techniques [10][11][12].…”

Arsenic Detection with Porous Gold Microelectrode Prepared via Dynamic Soft Templating

“…This limits the applicable electrode materials, and a carbonbased electrode is not applicable because of its low electrocatalytic activity. Therefore, many researchers have recently focused on the exploration of highly electrocatalytic metal nanomaterials including gold nanoparticles, (4)(5)(6)(7)(8) platinum nanoparticles, (9) silver nanoparticles, (10) cobalt oxide nanoparticles, (11) and nanostructured MnO x . (12) Among them, Au is known to have higher affinity to As(III) deposition and stripping.…”