Microextraction by packed sorbent for the analysis of pharmaceutical residues in environmental water samples by in situ derivatization-programmed temperature vaporizer-gas chromatography-mass spectrometry

1. Noche, G.G.
2. Laespada, M.E.F.
3. Pavón, J.L.P.
4. Cordero, B.M.
5. Lorenzo, S.M.