Cyclic Voltammetry Quantification of Iron in Ferrous Sulfate Supplements: A Method of Successive Addition to One Solution

There is a growing interest in the introduction of cyclic voltammetry to upper-level undergraduate chemistry students. This work presents a simple buffer-free cyclic voltammetry experiment for the quantification of elemental iron in ferrous sulfate supplements using standard addition to a single solution. The various student learning outcomes highlighted in this work include the introduction to the basic principles of cyclic voltammetry, the construction of a calibration curve based on the Randles−Sevcik equation, obtaining a linear regression equation using Microsoft excel, acid digestion of drug supplements, and quality assurance through a statistical evaluation of experimental data. This laboratory experiment also emphasizes the advantages of using the method of a standard addition to a single solution.