title: Simultaneous determination of hydroquinone, catechol and resorcinol by voltammetry using graphene screen-printed electrodes and partial least squares calibration.
abstract: Catechol (CC), resorcinol (RC) and hydroquinone (HQ) are dihydroxybenzene isomers that usually coexist in different samples and can be determined using voltammetric techniques taking profit of their fast response, high sensitivity and selectivity, cheap instrumentation, simple and timesaving operation modes. However, a strong overlapping of CC and HQ signals is observed hindering their accurate analysis. In the present work, the combination of differential pulse voltammetry with graphene screen-printed electrodes (allowing detection limits of 2.7, 1.7 and 2.4µmolL(-1) for HQ, CC and RC respectively) and the data analysis by partial least squares calibration (giving root mean square errors of prediction, RMSEP values, of 2.6, 4.1 and 2.3 for HQ, CC and RC respectively) has been proposed as a powerful tool for the quantification of mixtures of these dihydroxybenzene isomers. The commercial availability of the screen-printed devices and the low cost and simplicity of the analysis suggest that the proposed method can be a valuable alternative to chromatographic and electrophoretic methods for the considered species. The method has been applied to the analysis of these isomers in spiked tap water.
authors: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès, 1-11, 08028 Barcelona, Spain.
authors: Miriam
authors: M
authors: Aragó
authors: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès, 1-11, 08028 Barcelona, Spain. Electronic address: cristina.arino@ub.edu.
authors: Cristina
authors: C
authors: Ariño
authors: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès, 1-11, 08028 Barcelona, Spain.
authors: Àngela
authors: À
authors: Dago
authors: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès, 1-11, 08028 Barcelona, Spain.
authors: José Manuel
authors: JM
authors: Díaz-Cruz
authors: Departament de Química Analítica, Facultat de Química, Universitat de Barcelona, Martí i Franquès, 1-11, 08028 Barcelona, Spain.
authors: Miquel
authors: M
authors: Esteban
mesh_terms: D002138:Calibration; D002396:Catechols / Q000032:analysis* / Q000737:chemistry; D060766:Drinking Water / Q000032:analysis; D004566:Electrodes; D006108:Graphite / Q000737:chemistry; D006873:Hydroquinones / Q000032:analysis* / Q000737:chemistry; D016018:Least-Squares Analysis; D012118:Resorcinols / Q000032:analysis* / Q000737:chemistry
chemical_list: D002396:Catechols; D060766:Drinking Water; D006873:Hydroquinones; D012118:Resorcinols; D006108:Graphite; C034221:catechol; C031927:hydroquinone; C031389:resorcinol
keywords: Catechol; Hydroquinone; Partial least squares calibration; Resorcinol; Screen-printed electrodes; Voltammetry