饮用水中氟化物检测的能力验证

目的通过能力验证计划,对全国实验室饮用水中氟化物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检测结果。结果全国共985家实验室参加该项能力验证计划项目,获得满意结果的实验室910家,结果满意率为92. 4%,可疑结果的有26家,结果可疑率为2. 6%,离群结果的有49家,结果离群率为5. 0%。结论国内实验室饮用水中氟化物检测能力总体较好,少部分实验室的检测能力有待改进提高。

Proficiency test for determination of fluoride in drinking water

OBJECTIVE To evaluate the capacity of national laboratories for determination of fluoride 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 results provided by participant laboratories were analyzed by robust statistics and assessed using the Z-score. RESULTS A total of 985 laboratories throughout the country participated in the proficiency testing program. 910 laboratories,or92. 4% of total participating laboratories,obtained satisfactory result. Results provided by26 laboratories,or 2. 6% of total participating laboratories,were found to suggest doubts in their capacities. Finally, there were 49 laboratories, constituting 5. 0% of total participating laboratories,with results that were found to be outliers. CONCLUSION The capacity of national laboratories for determination of fluoride in drinking water has been ranked as satisfactory according to statistical analysis of the proficiency testing program results. Only a small portion of the participants require further improvement in their capacities.