2007年全国省级检验机构食品检测质控考核结果与分析——果脯中色素和二氧化硫含量测定

Quality Control Examination in 2007 for Provincial-Level Inspection Agencies on Testing Pigments and Sulfur Dioxide in Preserved Fruits

目的为了进一步了解省级食品检测机构的食品检测能力,提高实验室检测结果的准确性和可比性。方法采用计算稳健Z比分数(Z)的统计方法对检测结果进行分析,|Z|≤2为满意结果,2<|Z|<3为可疑结果,|Z|≥3为不满意结果。结果31个检测机构中29个机构按时报送了检测结果,占发放样品总数的93.55%;其中28个检测机构按照要求报告了全部测定值,测定数据总回收率为93.55%;其中二氧化硫检测结果满意、可疑和不满意百分率分别为87.10%、3.23%和9.68%;柠檬黄检测结果满意、可疑和不满意百分率分别为80.65%、9.68%和9.68%;胭脂红、日落黄和苋菜红的检测结果满意百分率均为87.10%。结论通过实验室间比对,各检测机构能够及时发现检测分析中存在的问题,查找可疑和不满意结果出现的原因,并进行有效整改,保证出具报告数据的准确性。

Objective To find out the proficiency of provincial-level food inspection agencies on food testing;and to improve the accuracy,reliability and comparability of testing results.Method Criteria for evaluating the testing results were based on the Z scores：｜ Z ｜ ≤2 for satisfactory results;2 ｜ Z ｜ 3 for uncertain results and ｜ Z ｜ ≥3 for unsatisfactory results.Results The samples for quality control were delivered to 31 provincial-level food inspection agencies,29 of them submitted results back on time（93.55%）.The satisfactory,uncertain and unsatisfactory results for sulfur dioxide test were 87.10%,3.23% and 9.68% ;and that for tartrazine were 80.65%,9.68% and 9.68% respectively.The satisfactory results for ponceau 4R,sunset yellow and amaranth were all 87.10%.Conclusion Through inter-laboratory comparison,provincial-level food inspection agencies recognized the problems in the process of testing,found out the cause of uncertain and unsatisfactory results,and conducted effective corrections to ensure the accuracy of the data issued in their reports.