Voltammetric analysis with the use of a novel electro-polymerized graphene-nafion film modified glassy carbon electrode: Simultaneous analysis of noxious nitroaniline isomers

Se realizó un análisis voltamperométrico para los isómeros nocivos de la nitroanilina comprobando la eficacia de una nueva película electropolimerizada modificadora de un electrodo vítreo de carbón.

A new modified electrode was constructed by the electro-polymn. of 7-[(2,4-dihydroxy-5-carboxybenzene)azo]-8-hydroxyquinoline-5-sulfonic acid (DHCBAQS) at a graphene-nafion modified glassy C electrode (GCE).  The construction process was performed stepwise and at each step the electrochem. characteristics were studied particularly with respect to the oxidn. of the 3 noxious analytes, 2-nitroaniline (2-NA), 3-nitroaniline (3-NA), 4-nitroaniline (4-NA); the electrode treated with the fluorescence reagent DHCBAQS performed best.  At this electrode, the differential pulse voltammetry peak currents of the 3 isomers increased linearly with their concns. of 0.05-0.60 μg/mL, and their corresponding limits of detection (LODs) were all ∼0.022 μg/mL.  Satisfactory results were obtained when this electrode was applied for the simultaneous quant. anal. of the nitroaniline isomer mixts. by principal component regression (PCR) and partial least squares (PLS) as calibration methods (relative prediction error (PRET) 9.04 and 9.23%) and av. recoveries 101.0 and 101.7%, resp..  The above novel poly-DHCBAQS/graphene-nafion/GCE was used for the simultaneous anal. of the 3 noxious nitroaniline isomers in water and wastewater.

Lin, Xiaoyun; Ni, Yongnian; Kokot, Serge

Journal of Hazardous Materials (2012), 243, 232-241