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Preparation and application of proficiency testing sample of carbofuran and dimethomorph in Chili
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(Shanghai Municipal Center for Disease Control and Prevention/State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, Shanghai 200336, China)

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    Abstract:

    Objective To prepare a vegetable matrix reference material with pesticide residues and organize a proficiency testing to assess the performance of domestic laboratories on the quantification of pesticide residues. Methods Through simulated field planting, chili sprayed with carbofuran and dimethomorph was used as raw materials to prepare chili matrix reference material with pesticide residues. After preparation, the related evaluation and proficiency testing were carried out. Assigned values were obtained from consensus values by robust analysis and the result were assessed using Z-scores. Results The reference material was assessed to be sufficiently homogeneous and stable (all P >0.05). A total of 155 laboratories, from 30 regions in China participated the proficiency testing, while 142 (91.6%), 5 (3.2%) and 8 (5.2%) laboratories had acceptable performance (|z|≤2.0), warning signal (2.0<|z|<3.0), and unacceptable performance (|z|≥3.0), respectively. Conclusion A chili matrix reference material with pesticide residues was successfully prepared for proficiency testing and the result indicated that most of domestic laboratories had acceptable capability of pesticides quantification in vegetables.

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QIU Xinlei, CHEN Yuhang, FENG Chao, XU Qian, LIN Yuanjie, LE Sunyang, JIN Yu'e, LU Dasheng, WANG Guoquan. Preparation and application of proficiency testing sample of carbofuran and dimethomorph in Chili[J].中国食品卫生杂志,2021,33(6):842-847.

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History
  • Received:September 30,2021
  • Online: January 04,2022
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