[Determination of imidacloprid residues in vegetable and tea samples using liquid chromatography-mass spectrometry/mass spectrometry].
A liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS) method was developed for the determination of imidacloprid in vegetable and tea samples. The sample was first extracted with acetonitrile and then cleaned up with Florisil and active charcoal column. The precursor ion/product ion transitions m/z 256.0/209.3 and m/z 256.0/175.2 were monitored, and m/z 209.3 was used for quantification. The good linearity was obtained in the range of 0.01 - 0.5 mg/L with the correlation coefficients (nu2) more than 0.997. The limit of quantification was 0.01 mg/kg. The recoveries were 76% - 90% at the spiked levels of 0.01, 0.05 and 0.2 mg/kg with the relative standard deviations of 7.4% - 11.0%. The method is rapid, sensitive and specific for imidacloprid analysis.
Xie
Wen
W
Technical Center of Zhejiang Entry-Exit Inspection and Quarantine Bureau, Hangzhou 310012, China. xw@ziq.gov.cn
Ding
Huiying
H
Jiang
Xiaoying
X
Xi
Junyang
J
D002853:Chromatography, Liquid; D007093:Imidazoles / Q000032:analysis*; D007306:Insecticides / Q000032:analysis*; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D012680:Sensitivity and Specificity; D053719:Tandem Mass Spectrometry; D013662:Tea / Q000737:chemistry*; D014675:Vegetables / Q000737:chemistry*
D007093:Imidazoles; D007306:Insecticides; D000073943:Neonicotinoids; D009574:Nitro Compounds; D010573:Pesticide Residues; D013662:Tea; C082359:imidacloprid