Determination of organophosphorus pesticides and metabolites in cereal-based baby foods and wheat flour by means of ultrasound-assisted extraction and hollow-fiber liquid-phase microextraction prior to gas chromatography with nitrogen phosphorus detection

1. González-Curbelo, M.T.
2. Hernández-Borges, J.
3. Borges-Miquel, T.M.
4. Rodríguez-Delgado, M.T.