Analysis and occurrence of selected medium to highly polar pesticides in groundwater of Catalonia (NE Spain): An approach based on on-line solid phase extraction-liquid chromatography-electrospray-tandem mass spectrometry detection

1. Postigo, C.
2. López de Alda, M.J.
3. Barceló, D.
4. Ginebreda, A.
5. Garrido, T.
6. Fraile, J.