The aim of this manuscript is to develop a combined method for the detection and elimination of oxalic acid (OA) in aqueous environment. For that, the surface of glassy carbon (GC) electrode has been modified by oxidation of L‐cysteine using cyclic voltammetric (CV) technique. After modification, the formation of a compact and uniform cysteic acid layer film was achieved and it was confirmed by surface analysis (scanning electron microscopy (SEM) and atomic force microscopy (AFM)). Estimation of the linear range, calibration function and limit of detection for OA were performed by differential pulse voltammetry using Cysteine‐modified electrode (Cysteine‐MGC). Due to its stability and sensitive response to OA, it was used for monitoring OA during its electrochemical oxidation at Ti/Pt anode. DPV analyses have been compared with classic titration method and HPLC achieving a good fit, confidence intervals and limits. The results are described and discussed in the light of the existing literature.

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A simple differential pulse voltammetric method based on a graphite paste electrode (GPE) was developed for the quantitative determination of folic acid (FA) in tablets. The electrode exhibits a clear improvement of the current response. A linear response in the electroanalytical approach exists from 4.97×10−6 to 2.94×10−5 mol L−1 with a limit of detection of about 2.67×10−6 mol L−1 in KCl solutions. The developed procedure was tested by recovery studies and compared with spectrophotometric and chromatographic methods. The results are described and discussed in the light of existing literature.

In the present paper, differential pulse voltammetry (DPV) techniques has been studied for monitoring of the concentration of oxalic acid (OA) during its electrochemical oxidation (EO) in acidic media at BDD anode applying a current of 60 mA cm 2 . Glassy carbon has been used for DPV measurements using two analytical procedures: calibration curves (DPVCC) and standard addition method (DPVSAM). DPV analyses have compared with classic titration method and HPLC achieving a good fit, confidence intervals and limits