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A Cerium Hexacyanoferrate (III) Nanoparticle‐modified Carbon Paste Electrode: Voltammetric Characterization and Behavior in the Presence of Dopamine
Author(s) -
Oliveira Denys Ribeiro,
Fernandes Daniela Silvestrini,
Carmo Devaney Ribeiro
Publication year - 2020
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201900441
Subject(s) - differential pulse voltammetry , cerium , cyclic voltammetry , ascorbic acid , redox , nuclear chemistry , chemistry , carbon paste electrode , fourier transform infrared spectroscopy , inorganic chemistry , electrochemistry , electrode , chemical engineering , food science , engineering
This study describes a fast and simple methodology for the preparation of Cerium (III) Hexacyanoferrate (II) (CeHCF) nanoparticles (NPs). The NPs were characterized by fourier transform infrared (FTIR), x‐ray diffraction (XRD), scanning electron microscopy (SEM) and cyclic voltammetry (CV). The CeHCF cyclic voltammogram indicate a well‐defined redox pair assigned as Fe 2+ /Fe 3+ in the presence of cerium (III), with a formal potential of E θ′ =0.29 V ( v =100 mV s −1 , KNO 3 ; 1.0 mol/L, pH 7.0). The carbon paste electrode modified with CeHCF (CeHCF‐CPE) was applied to the catalytic electrooxidation of dopamine applying Differential Pulse Voltammetry (DPV). DPV showed linear response at two concentration ranges, from 9.0×10 −7 to 8.0×10 −6 and 9.0×10 −6 to 1.0×10 −4 mol/L, with an LOD of 1.9×10 −7 and 1.0×10 −5 mol/L, respectively. The CeHCF‐CPE exhibited selectivity against substances commonly found in biological samples, with redox potentials close to that of dopamine, such as urea and ascorbic acid (AA). Subsequently the CeHCF‐CPE was successfully applied to the detection of dopamine in simulated urine samples, with recovery percentages ranging between 99 and 103%.