Determination of pharmaceutical drugs intap and river water using solidphase microextraction-comprehensive two dimensional gas chromatographyy-time of fllight mass spectrometry (SPME-GCxGC-ToF/MS) - Gomes, Paulo Clairmont Feitosa de Lima; Barnes, Brian; Santos Neto, Alvaro Jose dos; Lanças, Fernando Mauro; Snow, Nicholas H (Congresso Brasileiro de Espectrometria de Massas BrMASS, 2011)