Uncertainty Evaluation of Chlorpyrifos Residues in Cucumber Determination by Gas Chromatography-tandem Mass Spectrometry

WANG Chunming; ZHANG Yang; SHI Pengfei; YANG Bo

doi:10.13386/j.issn1002-0306.2020040045

Volume 42 Issue 15

Jul. 2021

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Science and Technology of Food Industry > 2021 > 42(15): 204-210. > DOI: 10.13386/j.issn1002-0306.2020040045

WANG Chunming, ZHANG Yang, SHI Pengfei, et al. Uncertainty Evaluation of Chlorpyrifos Residues in Cucumber Determination by Gas Chromatography-tandem Mass Spectrometry[J]. Science and Technology of Food Industry, 2021, 42(15): 204−210. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2020040045.

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Uncertainty Evaluation of Chlorpyrifos Residues in Cucumber Determination by Gas Chromatography-tandem Mass Spectrometry

1.
CAIQTEST Beijing Co., Ltd., Beijing 100123, China
2.
Chinese Academy of Inspection and Quarantine Comprehensive Test Center, Beijing 100123, China

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Received Date: April 05, 2020
Available Online: May 27, 2021

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Abstract

In order to make better decisions when the concentration of chlorpyrifos was located near the maximum residue limit. This study combined with the specific operation steps of our own laboratory, referred to cnas-gl 006, metrological verification (technical) specifications and other relevant standards, according to "GB 23200.113-2018 determination of 208 pesticides and metabolites residues in foods of plant origin", the uncertainties of chlorpyrifos residues in cucumber was evaluated by gas chromatography-tandem mass spectrometry(GC-MS/MS) combined with external standard quantitative method. The results showed that: at the level of 0.10 mg/kg and 95% confidence interval (k=2), the determination results of chlorpyrifos could be expressed as: (0.10 ± 0.01）mg/kg;The uncertainty component of standard solution preparation has the highest contribution to the uncertainty of chlorpyrifos. It could not be determined as unqualified when the residual amount of chlorpyrifos in cucumber ≥0.1 mg/kg and ≤ 0.11 mg/kg. It is to use the volumetric flask with smaller error,reduce the reading error of the operator,reduce the number of pipettes,and reduce the temperature difference of the environment,and then perform the measurement again. The uncertainty assessment results will minimize the possible disputes in the judging of the residue values near the maximum residue limits.
- pesticide residue,
- uncertainty,
- cucumber,
- chlorpyrifos,
- gas chromatography-tandem mass spectrometry (GC-MS/MS)

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