Otro
Determination of sulfate in ethanol fuel using an electrode chemically modified with polypyrrole by flow injection analysis
Registro en:
Journal of Biofuels, v. 1, n. 2, p. 220-227, 2010.
0976-3015
0000-0002-2296-1393
0072173018005712
6167204386206414
1923726000036625
8477732400095433
1183672452248157
Autor
Castilho, Michelle de Souza
Yamanaka, Hideko
Oliveira, Marcelo Firmino de
Zanoni, Maria Valnice Boldrin
Stradiotto, Nelson Ramos
Resumen
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 10−5 mol L−1 was obtained in flow 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.