A new voltammetric method was developed for the simple, rapid and inexpensive determination of 8-hydroxyquinoline (8HQ) on a modified electrode obtained by the electrodeposition of 1-amino-2-naphthol-4-sulfonic acid (ANSA) on the surface of a glassy carbon (GC) electrode. The electrode interfacial properties were investigated by electrochemical impedance spectroscopy (EIS). The electrochemical response of the ANSA-GC electrode toward 8-hydroxyquinoline was investigated by the use of square wave voltammetry. The ANSA-GC modified electrode showed two linear plots with 8hydroxyquinoline concentrations from 5 Â 10 À7 to 1.4 Â 10 À5 mol dm À3 (R 2 of 0.9984) and from 1.4 Â 10 À5 to 4.25 Â 10 À4 mol dm À3 with a correlation coefficient R 2 equal to 0.9967. The limit of detection was 1.6 Â 10 À7 mol dm À3 . The ANSA-GC modified electrode also showed excellent stability and reproducibility for up to two weeks. The analytical application of the ANSA-GC modified electrode was investigated for the determination of 8-hydroxyquinoline in a blush cosmetic product. The results in good agreement to those obtained by spectrophotometry as a standard method.
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