Multiresidue determination of organophosphorus pesticides in ginkgo leaves by accelerated solvent extraction and gas chromatography with flame photometric detection.
A rapid and simple method using accelerated solvent extraction and solid-phase extraction cleanup was developed and validated for the determination of 15 organophosphorus pesticides in ginkgo leaves by capillary gas chromatography with flame photometric detection. The pesticides were extracted at 100 degrees C under 1500 psi pressure in <20 min. The average recovery from 10 g ginkgo leaves, fortified at 3 levels ranging from 0.05 to 1.00 mg/kg, was 95.2% with a relative standard deviation of 4.6%. The limits of detection ranged from 1.11 x 10(-3) mg/kg (dimethoate) to 4.44 x 10(-3) mg/kg (dichlorvos). The proposed method showed acceptable accuracy and precision while minimizing environmental concerns, time, and labor. Furthermore, the method could be easily applied to the monitoring of these 15 organophosphorus pesticides in ginkgo leaves.
Yi
Xionghai
X
Institution of Agricultural Ecological and Environmental Toxicology, College of Agriculture and Biology, Qixin Rd 2678, Shanghai Jiao Tong University, Shanghai, People's Republic of China, 201101.
Lu
Yitong
Y
D002849:Chromatography, Gas / Q000379:methods*; D004006:Dichlorvos / Q000032:analysis; D004117:Dimethoate / Q000032:analysis; D020441:Ginkgo biloba / Q000378:metabolism*; D007306:Insecticides / Q000032:analysis; D009943:Organophosphorus Compounds / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D018515:Plant Leaves / Q000378:metabolism; D011312:Pressure; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D013997:Time Factors
D007306:Insecticides; D009943:Organophosphorus Compounds; D010573:Pesticide Residues; D010575:Pesticides; D012997:Solvents; D004006:Dichlorvos; D004117:Dimethoate