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Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (17): 129-136.doi: 10.11924/j.issn.1000-6850.casb2020-0216

Special Issue: 植物保护 园艺

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Evaluation of the Uncertainty in Determining Organophosphorus and Pyrethroid Pesticides Residue in Vegetables and Fruits by Gas Chromatography

Yu Tingting1(), Qiu Pengcheng2(), Chen Qiang1, Shi Fu1, Yang Yajun1   

  1. 1Ordos Agricultural and Livestock Product Quality and Safety Center,Ordos Inner Mongolia 017000
    2Ordos Academy of Agricultural and Animal Husbandry Sciences, Ordos Inner Mongolia 017000
  • Received:2020-06-29 Revised:2020-09-04 Online:2021-06-15 Published:2021-06-29
  • Contact: Qiu Pengcheng E-mail:26286496@qq.com;qpc1548@126.com

Abstract:

The uncertainty of measuring organophosphorus and pyrethroid pesticides residue in vegetables and fruits by gas chromatography was evaluated in this study. Taking NY/T 761—2008 standard method as the research object, chlorpyrifos and fenpropathrin were selected to represent the first and second parts of the method respectively and the uncertainty of the method was evaluated from seven aspects including the sample pretreatment process, instrument measurement and standard solution preparation etc. The relative expanded uncertainty of chlorpyrifos and fenpropathrin pesticide residue is 0.9% and 1.0% (k=2) respectively, among which the uncertainty component introduced by gas chromatograph peak area, standard solution preparation and standard recovery rate are the main source. In order to reduce the uncertainty of test results, it is necessary to improve the stability of equipment, simplify the preparation process of standard solution and improve the operation ability in practice. Simultaneously, the results of uncertainty should be applied to judge whether the detection data is to be in the critical value of limit.

Key words: uncertainty, pesticide residue, gas chromatography, organophosphorus pesticides, pyrethroid pesticides

CLC Number: