Evaluation of Measurement Uncertainty for the Determination of Pyridaben and Other Nine Pesticide Residues in Tea by Gas Chromatography-Mass Spectrometry

LI Jun; CAI Tao; DAI Hongjing; SU Meicheng; ZHU Yuan; WANG Zhen

doi:10.13386/j.issn1002-0306.2021090073

Volume 43 Issue 14

Jul. 2022

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Science and Technology of Food Industry > 2022 > 43(14): 311-322. > DOI: 10.13386/j.issn1002-0306.2021090073

LI Jun, CAI Tao, DAI Hongjing, et al. Evaluation of Measurement Uncertainty for the Determination of Pyridaben and Other Nine Pesticide Residues in Tea by Gas Chromatography-Mass Spectrometry [J]. Science and Technology of Food Industry, 2022, 43(14): 311−322. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021090073.

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Evaluation of Measurement Uncertainty for the Determination of Pyridaben and Other Nine Pesticide Residues in Tea by Gas Chromatography-Mass Spectrometry

1.
Guizhou Provincial Supervision and Testing Center for Agricultural Product Quality, Agricultural Product Quality and Safety Risk Assessment Laboratory of the Ministry of Agriculture, Guiyang 550004, China
2.
School of Chemistry and Chemical Engineering, Qiannan Normal College for Nationalities, Duyun 558000, China

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Received Date: September 05, 2021
Available Online: May 19, 2022

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Abstract

Abstract

Objective: To evaluate the uncertainty of determination of nine pesticides in tea by gas chromatography and mass spectrometry (GC-MS). Methods: The uncertainties of nine pesticide residues in tea were evaluated by GC-MS combined with internal standard quantitative method. Five evaluation components, including pesticide standards preparation, sample weighing, extraction, purification and detection were studied. Results: The main uncertainty in the determination of pesticides came from the fitting process of standard curve (u_rel(R)=1.45%~7.93%), sample recovery (u_rel(Q)^a=2.64%~3.54%, u_rel(Q)^b=1.62%~5.89%) and standard solution preparation (u_rel=2.46%), then the repetition of the sample measurement (u_rel(A)=0.5%~2.56%), especially at the extremely low concentration. Conclusion: For the reliable results, it is important to choose the accurate sample preparation, the concentration range of standard curve. And when the results indicates positive, reassays should be done in triplicate.
- gas chromatography and mass spectrometry,
- pesticide residues,
- tea,
- uncertainty

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References (28)

References

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