Development of methodology for analysis of nonsteroid anti-inflammatory drug residues in water by SPE and LC-ESI-Tof/MS - Nazario, Carlos Eduardo Domingues; Franco, Maraissa; Ortega, Scarlet Nere; Titato, Guilherme Miola; Santos Neto, Alvaro Jose dos; Lanças, Fernando Mauro (Congresso Brasileiro de Espectrometria de Massas BrMASS, 2011)