Theoretical and experimental study of the electrochemical detection of chemical compounds in aqueous medium

Abstract

In this study, the simulation and calculation of linear sweep voltammetry (LSV) profiles for quasi-reversible soluble-soluble systems using the semi-analytical approach are investigated. A thorough qualitative and quantitative analysis of the shape and position of linear sweep voltammograms is conducted by varyingthe adimensional rate constant (Λ) and charge transfer coefficient (α). Specifically, by varying both the Λ and α on the voltammetric peak characteristics, a series of kinetic diagrams are constructed. Subsequently, sigmoidal Boltzmann functions and linear equations are presented based on the interpolation functions of these kinetic curves. The derived equations serve as user-friendly tools for calculating the electrochemical standard rate constant for quasi-reversible charge transfer. Theoretical results arevalidatedthrough the examination ofthe electro-oxidation of ferrocyanide, as well as the electrochemical determinations of dopamine (DA), uric acid (UA), and ascorbic acid (AA) on screen-printed graphite electrodes.