Affiliation: | a Federal University of Ceará, CT/DEMM, CE, Brazil b Federal University of Rio de Janeiro, EP/COPPE/PEMM, RJ, Brazil c Federal University of Rio de Janeiro, EQ/DPI, RJ, Brazil d Electrical Energy Research Center, RJ, Brazil e University Fed. do Ceará, CC/Dep. de Quím. Anal. e Físico-Química, CE, Brazil |