Electroanalytical Method for Determining Pyrogallol in Biodiesel in the Presence of a Surfactant

A sensitive, straightforward electroanalytical method for determining pyrogallol (PY) in biodiesel in the presence of a surfactant was developed using a voltammetric technique and screen‐printed electrodes. The influence of surfactant addition (sodium dodecyl sulfate (SDS), Triton X‐100 (TX‐100), cetyltrimethylammonium bromide (CTAB), tetrabutylammonium iodide (TBAI), tetrabutylammonium bromide (TBAB), or tetraethylammonium bromide (TEAB)) on the supporting electrolyte (0.04 mol L−1 BrittonRobinson buffer) was evaluated. Only CTAB significantly increased the oxidation peak current. Under optimal conditions, the method demonstrated linearity over the concentration range of 0.8–9.0×10−6 mol L−1, with limits of detection and quantification of 4.9×10−7 and 1.5×10−6 mol L−1, respectively. The results were satisfactory, relative to those obtained using high‐performance liquid chromatography (HPLC).