Analytical performance and stability studies of CoAu/rGO-based electrochemical sensor for arsenic(III) detection in
Kristina Radinović1, Jadranka Milikić1, Nemanja Gavrilov1
1University of Belgrade, Faculty of Physical Chemistry, Studentski trg 12-16, 11158, Belgrade, Serbia.
Abstract:
Cobalt-gold nanoparticles (CoAu) were grafted on reduced graphene oxide (rGO) using a simple and scalable procedure. As-prepared CoAu/rGO nanocomposites were employed as electrode materials to detect trace amounts of arsenic(III) ions (As3+) in aqueous solutions using anodic stripping voltammetry. CoAu/rGO was thoroughly tested in the presence of As3+ in a neutral medium (bicarbonate buffer, pH = 7), and the limit of detection was found to be as low as 1.51 ppb, significantly lower than the maximum permissible value set by the World Health Organization at 10 ppb. Its possible sensor application was confirmed by the preserved response to As3+ ions in samples simultaneously containing interferents such as Cu2+ ions. The real-life application of this material was validated by the determination of As3+ ions in real samples from the city water supply system (the city of Zrenjanin in Vojvodina) and rivers (the Begej River, the Drina River and the Danube River). Besides the high sensitivity of CoAu/rGO towards As3+ ions, its stability was also monitored over a certain time, demonstrating that it can be used with great precision in sensors for routine water analysis over extended periods. Overall, this study offers a green, highly stable, accurate and precise electrochemical platform for arsenic detection that requires reagent-free sample preparation.
More Related Videos
Related Concept Videos
Voltammetry: Factors Affecting Measurements
Voltammetry: Stripping Methods
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Precipitation and Co-precipitation
Electrodeposition
Electrodeposition can...
Extraction: Advanced Methods
Atomic Absorption Spectroscopy: Lab
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...


