Sensor for diuron quantitation based on the P450 biomimetic catalyst nickel(II) 1,4,8,11,15,18,22,25-octabutoxy-29H,31H-phthalocyanine

Autor(es)

Wong, Ademar ^[1] ; de Vasconcelos Lanza, Marcos Roberto ^[2] ; Taboada Sotomayor, Maria Del Pilar ^[1]

Afiliação do(s) autor(es)

^[1] State Univ Sao Paulo UNESP, Inst Chem, Dept Analyt Chem, BR-14801970 Araraquara, SP - Brazil

^[2] Sao Paulo Univ IQSC, Inst Chem, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 690, p. 83-88, FEB 1 2013.
• Citações Web of Science: 17

Resumo

A 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 x 10(-6) and 1.5 x 10(-4) mol L-1, a sensitivity of 22817 (+/- 261) mu A L mol(-1), and detection and quantification limits of 6.14 x 10(-6) and 2 x 10(-6) 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). (C) 2012 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/12296-6 - Sistemas bi-biomiméticos à base de materiais nanoporosos e nanoparticulados visando obtenção de métodos sensíveis e seletivos para determinação de agrotóxicos e corantes
• Beneficiário: Maria Del Pilar Taboada Sotomayor
• Linha de fomento: Auxílio à Pesquisa - Regular