Otake Takamitsu, Yarita Takashi, Aoyagi Yoshie, Numata Masahiko, Takatsu Akiko
National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, Ibaraki, 305-8563, Japan,
Anal Bioanal Chem. 2014 Nov;406(28):7337-44. doi: 10.1007/s00216-014-8160-6. Epub 2014 Sep 26.
A proficiency test for the analysis of pesticide residues in brown rice was carried out to support upgrading in analytical skills of participant laboratories. Brown rice containing three target pesticides (etofenprox, fenitrothion, and isoprothiolane) was used as the test samples. The test samples were distributed to the 57 participants and analyzed by appropriate analytical methods chosen by each participant. It was shown that there was no significant difference among the reported values obtained by different types of analytical method. The analytical results obtained by National Metrology Institute of Japan (NMIJ) were 3 % to 10 % greater than those obtained by participants. The results reported by the participant were evaluated by using two types of z-scores, that is, one was the score based on the consensus values calculated from the analytical results of participants, and the other one was the score based on the reference values obtained by NMIJ with high reliability. Acceptable z-scores based on the consensus values and NMIJ reference values were achieved by 87 % to 89 % and 79 % to 94 % of the participants, respectively.
为提高参与实验室的分析技能，开展了一项糙米中农药残留分析的能力验证试验。含有三种目标农药（醚菊酯、杀螟硫磷和稻瘟灵）的糙米用作测试样品。测试样品分发给57个参与实验室，并由各实验室选择合适的分析方法进行分析。结果表明，不同类型分析方法得到的报告值之间无显著差异。日本国家计量院（NMIJ）得到的分析结果比参与实验室得到的结果高3%至10%。通过两种z值对参与实验室报告的结果进行评估，一种是基于参与实验室分析结果计算出的一致性值得到的分数，另一种是基于NMIJ得到的高可靠性参考值得到的分数。分别有87%至89%和79%至94%的参与实验室基于一致性值和NMIJ参考值获得了可接受的z值。
