米粉中六六六农药残留测定的能力验证研究

Proficiency testing on the determination of hexachlorocyclohexane in rice flour

目的设计组织米粉中六六六测定能力验证项目,评价食品检验机构对有机氯农药残留的检测能力。方法制备单一水平样品,对参加实验室米粉中六六六测定结果进行稳健统计分析,以稳健Z比分数评价实验室检测能力,对实验操作记录进行技术分析。结果在95%置信水平下,样品均匀性符合要求,且至少在2个月内保持稳定,满足能力验证计划要求。42家实验室参加了本次计划,满意结果数为30家,满意率为71.4%。结论多数参加实验室对六六六农药残留检测结果满意,部分实验室检测能力有待提高。

Objective To design and conduct the proficiency testing program（PTP） for determination of hexachlorocyclohexane（BHC） in rice flour, in order to evaluate the detection capacity of food inspection agencies on the residue of organochlorine pesticides. Methods The single-level test sample was prepared for this program. The results of determination of BHC in laboratory rice flour were analyzed by robust statistics and the proficiency of the participant laboratories was evaluated by Z score. Results The analysis showed that the samples were homogeneous and staying stable at least 2-month period at the confidence level of 95%, which met the requirements of PTP. A total of 42 laboratories participated in the PTP, among which 30 laboratories had satisfactory results, and the satisfaction rate was 71.4%. Conclusion The majority of participant laboratories are evaluated to have satisfactory proficiency with the determination of BHC, while some laboratories＇ testing capabilities need to be improved.