生活饮用水及其水源水中菌落总数测定的不确定度评定及实例分析

Uncertainty assessment and cases analysis in the detection of the standard plate-count bacteria in drinking water and source water

目的评定生活饮用水及其水源水中菌落总数测定的不确定度。方法依据GB/T 5750.12-2006《生活饮用水标准检验方法微生物指标》中的方法进行检测,分析菌落总数的不确定度来源,采用指数法来评定菌落总数的不确定度。结果在包含概率为95%时,生活饮用水中菌落总数的扩展不确定度为0.047,水源水中菌落总数的扩展不确定度为0.024,适用于菌落总数不确定度的评定。结论利用指数法可以对菌落总数的不确定度进行合理判定。

Objective To assess the uncertainty of standard plate - count bacteria in drinking water and the source wa- ter. Methods The detection of the standard plate - count bacteria was based on GB/T 5750. 12 - 2006 Standard Examina- tion Methods For Drinking Water - Microbiological Parameters. The source of the uncertainty in the detection was analyzed adopting index method to assess. Results As the coverage probability was 95 percent, the expanded uncertainty of drinking water and the source water was respectively 0. 047 and 0. 024. It was adopted to assess the uncertainty of the standard plate - count bacteria. Conclusion It is suitable to assess the uncertainty of the standard plate - count bacteria using the index method.