Wong, Ademar [UNESP]De Vasconcelos Lanza, Marcos RobertoSotomayor, Maria Del Pilar Taboada [UNESP]2014-05-272014-05-272013-01-21Journal of Electroanalytical Chemistry, v. 690, p. 83-88.1572-6657http://hdl.handle.net/11449/74405A biomimetic sensor based on a carbon paste electrode modified with the nickel(II) 1,4,8,11,15,18,22,25-octabutoxy-29H,31H-phthalocyanine complex was developed as a reliable alternative technique for the sensitive and selective analysis of the herbicide diuron in environmental media. The sensor was evaluated using cyclic voltammetry and amperometric techniques. The best amperometric responses were obtained at 750 mV vs. Ag/AgCl (KClsat), using 0.1 mol L-1 phosphate buffer solution at pH 8.0. Under these conditions, the sensor showed a linear response for diuron concentrations between 9.9 × 10-6 and 1.5 × 10-4 mol L -1, a sensitivity of 22817 (±261) μA L mol-1, and detection and quantification limits of 6.14 × 10-6 and 2 × 10-5 mol L-1, respectively. The presence of the nickel complex in the carbon paste improved selectivity, stability, and sensitivity (which increased 700%), compared to unmodified paste. The applicability of the sensor was demonstrated using enriched environmental samples (river water and soil). © 2012 Elsevier B.V. All rights reserved.83-88engBiomimetic sensorDiuronNickel(II) 1,4,8,11,15,18,22,25- octabutoxy-29H,31H-phthalocyanineP450 enzymeA-carbonAg/AgClAmperometricAmperometric responseBiomimetic catalystsBiomimetic sensorsCarbon pastesDetection and quantification limitEnvironmental mediaEnvironmental sampleLinear responseNickel complexPhosphate buffer solutionsPhthalocyanine complexesRiver waterSelective analysisBiomimeticsCarbonCyclic voltammetryNickel compoundsSensorsUreaHerbicidesArtigo10.1016/j.jelechem.2012.11.007WOS:000317159000013Acesso restrito2-s2.0-848723132152933194342093387