1. PPGQ-CCN-DQ, Universidade Estadual do Piauí, P.O. Box 381, 64002-150 Teresina, PI, Brazil
2. CDMF, Universidade Federal de São Carlos, P.O. Box 676, 13565-905 São Carlos, SP, Brazil
3. Department of Analytical and Physical Chemistry, University Jaume I, 12071 Castelló, Spain
4. Department of Physical Chemistry, University of Valencia (UV), 46100, Burjassot, Spain