2016年生活饮用水中林丹检测的能力验证结果分析

Analysis results of proficiency test for determination of lindane in drinking water in 2016

目的通过能力验证计划,对全国实验室的生活饮用水中林丹含量检测能力进行分析和评价。方法能力验证计划中使用的被测样品参考二级标准物质制备方法制备,采用单因子方差分析法和线性拟合趋势分析法分别对其进行均匀性检验和稳定性检验。将各参加实验室提交的结果进行迭代稳健统计分析,采用Z值评定各参加实验室的测试结果。结果全国共309家实验室参加该项能力验证,获得满意结果的实验室286家,结果满意率为92.6%,可疑结果的有10家,结果可疑率为3.2%,离群结果的有13家,结果离群率为4.2%。结论能力验证统计结果表明,国内实验室的生活饮用水中林丹检测能力总体较好,少部分实验室的检测能力有待改进提高。

Objective To evaluate the capacity of national laboratories for determination of lindane in drinking water using proficiency testing program. Methods The preparation method of the secondary standard materials were used as the reference for the sample preparation in this proficiency testing program. The homogeneity and stability of the samples were tested by single factor analysis of variance（ ANOVA） and linear regression. The result provided by participant laboratories were analyzed by robust statistics and assessed using the Z-score. Results 309 laboratories throughout the country participated in the proficiency testing program. 286 laboratories, or 92. 6% of total participating laboratories,obtained satisfactory result. Results provided by 10 laboratories,or 3. 2% of total participating laboratories, were found to suggest doubts in their capacities. Finally,there were 13 laboratories,constituting 4. 2% of total participating laboratories,with result that were found to be outliers. Conclusion The capacity of national laboratories for determination of lindane in drinking water has been ranked as satisfactory according to statistical analysis of the proficiency testing program result. Only a small portion of the participants require further improvement in their capacities.