Determination of organochlorine and organophosphate pesticide residues in fruits, vegetables and sediments.
A method is described for the determination of organochlorine and organophosphate pesticide residues in fruits, vegetables and sediments. The concentrated solvent extract was sealed in a polymeric membrane tube, dialysed in cyclohexane and the solvent replaced with hexane. The organophosphates were analysed on a specific thermionic detector without further clean-up. For the organochlorine pesticides the extract was eluted through 3 g of alumina and analysed on GC/ECD. The clean-up for sediment extract was carried out on a 10 g alumina column with 100 mL hexane containing 5% acetone and the eluate was concentrated to 5 mL. The detection limit for organophosphates on a 40 g sample and a final volume of 10 mL was on the average 0.01 mg/kg. The detection limit for organochlorine pesticides, with the final volume of 25 mL, was 0.005 mg/kg for all pesticides except for p,p'-DDT and endosulfan sulphate, which was 0.01 mg/kg. The detection limit for organochlorine pesticides in sediment, with the final volume of 2 mL, was less than 1 microgram/kg and for organophosphate pesticides less than 10 micrograms/kg when the final volume was made to 0.5 mL. At the detection limits the method produced a very high coefficient of variation for both organochlorine and organophosphate pesticides.
Ahmad
N
N
Australian Environmental Science and Water Technologies, West Ryde, NSW, Australia.
Bugueno
G
G
Guo
L
L
Marolt
R
R
D002849:Chromatography, Gas / Q000191:economics / Q000379:methods; D004058:Diffusion; D005638:Fruit / Q000737:chemistry*; D006843:Hydrocarbons, Chlorinated; D007306:Insecticides / Q000032:analysis*; D009943:Organophosphorus Compounds; D012987:Soil / Q000032:analysis*; D013997:Time Factors; D014675:Vegetables / Q000737:chemistry*
D006843:Hydrocarbons, Chlorinated; D007306:Insecticides; D009943:Organophosphorus Compounds; D012987:Soil