1UNESP - Universidade Estadual Paulista, Instituto de Química, – Araraquara – SP, Brazil
2USP – Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - Departamento de Química, Ribeirão Preto, SP – Brazil
*Email ID: nrstradi@iq.unesp.br
In this work, an electrode chemically modified with polypyrrole (PCME) was employed for determination of sulfate in ethanol fuel using a FIA system. The PCME was prepared by polymerization of pyrrole at a glassy carbon electrode by means of cyclic voltammetry technique. An analytical curve from 1.0 x 10−5 to 8.0 x 10−5mol L−1 was obtained inflow injection system based on the PCME. An amperometric sensibility of 2.3 x 10−3 A mol−1 L and a detection limit of 2.5 x 10−6 mol L−1 were achieved. The proposed method was employed for determination of sulfate ions in commercial samples of ethanol fuel. The results were in good agreement with those obtained by the ionic chromatographic method.
Ethanol fuel, Sulfate determination, Polypyrrole-film, Flow injection analysis
