Determination of organophosphorus insecticides in edible oils and fats by splitless injection of the oil into a gas chromatograph (injector-internal headspace analysis).
Direct injection of oil or fat into a moderately heated injector enables performance of a kind of headspace technique in the injector: oil or fat is diluted 1:1 with acetone and injected into a vaporizing chamber at 200 degrees C. Components, for example organophosphorus insecticides, evaporate from the oil film on the insert wall and are transferred into the column in the splitless mode; the oil slowly flows along the wall to the bottom of the insert and is retained there in a kind of a bag. Using a flame photometric detector, detection limits are below 10 micrograms/kg.
Grob
K
K
Kantonales Labor, Zürich, Switzerland.
Biedermann
M
M
Giuffré
A M
AM
D002849:Chromatography, Gas / Q000379:methods*; D004041:Dietary Fats / Q000032:analysis*; D004042:Dietary Fats, Unsaturated / Q000032:analysis; D005506:Food Contamination / Q000032:analysis*; D007306:Insecticides / Q000032:analysis*; D000069463:Olive Oil; D009943:Organophosphorus Compounds; D010938:Plant Oils / Q000032:analysis*
D004041:Dietary Fats; D004042:Dietary Fats, Unsaturated; D007306:Insecticides; D000069463:Olive Oil; D009943:Organophosphorus Compounds; D010938:Plant Oils; C052387:cocoa butter