A method for simultaneous determination of 18 pyrethroid pesticide residues in eggs based on liquid chromatography tandem mass spectrometry(LC-MS/MS)was established.The sample was extrac-ted with 10 mL of acetonitrile and purified by a Florisil solid phase extraction column.A gradient elution was performed using 5 mmol/L ammonium acetate solution(A)-methanol(B)as the mobile phase.Qualitative and quantitative analysis was performed using multiple reaction monitoring mode(MRM)at ion source temperature of 450 ℃.The results showed that 18 pyrethroid pesticides had good linear rela-tionship(r＞0.995)in the mass concentration range of 5.00-200.00 µg/L.The limit of detection was 5.00 μg/kg.At the spiked level of 20.0-100 μg/kg,the recovery rate was 79.2％-107％,and the relative standard deviation was 0.707％-8.91％(n=3).
pyrethroidegghigh performance liquid chromatography tandem mass spectrometry(LC-MS/MS)
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