Determination of flupoxam residues in soil by high performance liquid chromatography

High-performance liquid chromatography with UV detection was used to determ ine the residues of flupoxam (a new herbicide) in soils. Soil samples were extracted with aqueous methanol. The soil extracts were cleaned up and conc entrated using two solid phase extraction columns: a polymeric stationary p hase based on a polystyrene-divinylbenzene resin (Lichrolut EN) and alumina . Recovery experiments were performed at ppb levels in spiked soil samples. The recovery was 76 +/- 1.7 % for flupoxam in the range 5-100 mu g kg(-1) of soil. Limit of determination was 3 mu g kg(-1).