Optimization of in situ derivatization SPME by experimental design for GC-MS multi-residue analysis of pharmaceutical drugs in wastewater - Gomes, Paulo Clairmont Feitosa de Lima; Barletta, Juliana Yamashita; Nazario, Carlos Eduardo Domingues; Santos Neto, Alvaro Jose dos; Von Wolff, Marya Anne; Coneglian, Cassiana Maria Coneglian; Umbuzeiro, Gisela Aragão; Lanças, Fernando Mauro (Journal of Separation Science, 2011)