Single-step multi-cartridge clean-up for organophosphate pesticide residue determination in vegetable oil extracts by gas chromatography.
A multi-cartridge system has been developed which, in a single step, performs the extraction and clean-up of organophosphate (OP) pesticide residues from oils and fatty extracts. A solution in hexane containing up to 1.8 g of lipidic material is loaded on to an Extrelut-3 column to which a silica-gel cartridge and a C18 silica cartridge have been connected in series. The OP pesticide residues are eluted with 15 ml of acetonitrile. Carry-over of fatty material is in the range 2-5 mg per 1.8 g of different oils, which makes the final solution amenable to capillary gas chromatography. Recoveries of 23 OP pesticides were in the range 82-111%. The whole procedure takes ca. 20 min and compares favourably with current procedures.
Di Muccio
A
A
Laboratorio di Tossicologia Applicata, Istituto Superiore di Sanita, Rome, Italy.
Ausili
A
A
Vergori
L
L
Camoni
I
I
Dommarco
R
R
Gambetti
L
L
Santilio
A
A
Vergori
F
F
D002849:Chromatography, Gas; D009943:Organophosphorus Compounds / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D010938:Plant Oils / Q000032:analysis*
D009943:Organophosphorus Compounds; D010573:Pesticide Residues; D010938:Plant Oils