Electrochemical Determination of the Concentration of Vanadium(IV) and Vanadium(V) Simultaneously

Abstract

The electrochemical measurement of multivalent cations concentration (EM2C2) technique was demonstrated to simultaneously determine the concentration of the redox pair V(IV)/V(V) in aqueous solutions. This technique consists of measuring the current at an applied potential under diffusion transport using a rotating disk electrode. The influence of several parameters such as scan rate potential, rotation rate of the electrode, and interferences in the measurements were investigated. Different linear equations derived from these parameters were compared to improve the analysis. Detection limits using the EM2C2 methodology were 1 mM for V(IV) and >1 mM for V(V) making the methodology suitable to perform the measurement of vanadium speciation with relative ease and less time at low cost.

Amperometric Sensor Based on Au/MWCNT for Simultaneous Speciation of Cr(III) and Cr(VI) Ionic Species

“…Recently, Botte has reported a new electrochemical method for the simultaneous quantification of cationic species, called Electrochemical Measurement of Multi Cation Concentration (EM2C2) (7,8). This technique is based on the measurement of current intensity in hydrodynamic voltammograms under mass transport limiting conditions, where the current intensity of the process is independent from potential, but it is a function of the rotation speed, a plateau is observed in the voltammograms, and the current can be described by the Levich expression, where there is a linear relationship between the limit current and the concentration of the analyte:…”