A simple graphene modified electrode for the determination of antimony (III) in edible plants and beverage

Liendo, Fabiana; Paz de la Vega, Amaya; Jesus Aguirre, Maria; Godoy, Fernando; Marti, Angel A.; Flores, Erick; Pizarro, Jaime; Segura, Rodrigo

Abstract

Antimony(III) is a rare electroactive specie present on Earth, whose concentration is not typically determined. The presence of high concentrations of antimony is responsible for a variety of diseases, which makes it desirable to find convenient and reliable methods for its determination. We have developed a convenient glassy carbon modified electrode with electroreduced graphene oxide GC/rGO for the first time determination of Sb(III) in commercial lettuce, celery, and beverages. The surface of the electrode was characterized by scanning electron microscopy (SEM) and cyclic voltammetry, indicating a heterogeneous and rough surface with a real area of 0.28 cm(2), which is similar to 2.5 times the area of GC. The optimal chemical and electrochemical parameters used were: sodium acetate buffer (pH = 4.3), an accumulation potential of 1.0 V and an accumulation time of 150 s. The analytical validation was developed evaluating the linear range (10-60 mu g L-1), limit of detection (2.5 mu g L-1), accuracy, repetibility and reproducibility with satisfactory results (relative standard deviation (RSD) values lower than 10%). All the analyzes performed in real samples by stripping voltammetry were compared with GF-AAS, showing statistically similar values, demonstrating that GC/rGO could be effectively applied in the analysis of food samples.

Más información

Título según WOS: A simple graphene modified electrode for the determination of antimony (III) in edible plants and beverage
Título de la Revista: FOOD CHEMISTRY
Volumen: 367
Editorial: Elsevier
Fecha de publicación: 2022
DOI:

10.1016/j.foodchem.2021.130676

Notas: ISI