1. Institute of Chemistry Federal University of Rio Grande do Norte Lagoa Nova CEP 59078-400 Natal/RN Brazil
2. Postgraduate Program in Petroleum Engineering Science Federal University of Rio Grande do Norte Lagoa Nova CEP 59078-400 Natal/RN Brazil
3. National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM) Institute of Chemistry, Unesp P.O. Box 355 14800-900 Araraquara, SP Brazil