De Paoli M, Barbina M T, Mondini R, Pezzoni A, Valentino A, Grob K
Centro Regionale per la Sperimentazione Agraria, Pozzuolo del Friuli (UD), Italy.
J Chromatogr. 1992 Dec 16;626(1):145-50. doi: 10.1016/0021-9673(92)85338-t.
The determination of organophosphorus pesticides in fruits by size-exclusion chromatography (SEC) on a polystyrene column coupled on-line to a gas chromatography (GC) system was unsatisfactory as a result of interfering peaks in GC. A liquid chromatography step on silica gel was therefore inserted between the SEC and GC steps to filter out polar by-products. Samples of fruit (apples, grapes and kiwi fruits) were extracted, then the extract filtered or centrifuged and injected into an automated on-line SEC-liquid chromatography-GC-flame photometric detection. Recoveries were about 95% and the detection limits about 1 ng/g.
