OCCUPATION AND HEALTH ›› 2026, Vol. 42 ›› Issue (5): 609-613.

• Treatise • Previous Articles     Next Articles

Evaluation of uncertainty in the determination of six pesticide residues in celery by QuEChERS-LC-MS/MS method

ZHAI Yanan, XU Qian, LIU Lingkun, SHAO Hanbing, LU Wei, YANG Fengyan   

  1. Cangzhou Center for Disease Control and Prevention,Cangzhou,Hebei 061000,China
  • Received:2025-05-28 Revised:2025-06-23 Online:2026-03-01 Published:2026-03-10

Abstract:

Objective To evaluate the uncertainty in the determination of six pesticide residues(difenoconazole,imidacloprid,acetamiprid,dinotefuran,pyrimethanil,and thiamethoxam) in celery using the QuEChERS-LC-MS/MS method. Methods The residues of the six pesticides in celery were determined according to GB 23200.121-2021 "National Food Safety Standard-Determination of Residues of 331 Pesticides and Their Metabolites in Foods of Plant Origin by Liquid Chromatography-Tandem Mass Spectrometry". A mathematical model was established to analyze and quantify the factors contributing to uncertainty,including sample weighing,standard solution preparation,standard curve fitting,repeatability,method recovery,and instrument performance. Results When the contents of difenoconazole,imidacloprid,acetamiprid,dinotefuran,pyrimethanil,and thiamethoxam in the samples were 4.56,1.36,1.38,0.850,20.2,and 1.48 mg/kg,respectively,the expanded uncertainties were 0.838,0.192,0.170,0.124,2.08,and 0.170 mg/kg. Conclusion The main sources of uncertainty in this method are instrument performance,standard curve fitting,repeatability,recovery,sample weighing,and standard solution preparation. The results of this assessment can provide a basis for the accuracy of pesticide residue measurements in celery using the QuEChERS-LC-MS/MS method.

Key words: Celery, Difenoconazole, Imidacloprid, Acetamiprid, Dinotefuran, Pyrimethanil, Thiamethoxam, Uncertainty evaluation

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