Proficiency Testing Process Control and Result Analysis of Determination of Carbofuran in Rice Flour by Liquid Chromatography-Mass Spectrometry
By participating in the verification of the determination ability of carbofuran in rice flour,the test re-sults and quality control process were analyzed and evaluated to improve the detection ability and level of in-spectors and ensure the accuracy of the test results.According to the guidelines for participating in proficiency testing and GB 23200.121-2021 Food Safety National Standard for Pesticide Residues in Plant-based Foods-Determination of 331 Pesticide Residues and their metabolites by liquid chromatography-mass spectrometry,the sample is processed and analyzed by liquid chromatography-mass spectrometry,and the detection process and re-sults were evaluated through two quality control methods,namely spiked sample experiment and personnel com-parison.The results showed that there was a good linear relationship between the concentration of chlorpyrfos within 5～250 ng/mL,and the correlation coefficient was 0.999 8.The Z value of sample number(2)was-0.02,which was evaluated as satisfactory.The detection method is rapid,simple,high recovery rate and high accuracy.By organizing and participating in capacity verification activities regularly,the reliability of test results can be improved and the daily quality management of the laboratory can be strengthened.
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