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目的评估水源水中菌落总数检测结果的不确定度。方法按照GB/T 5750.12-2006《生活饮用水标准检验方法微生物指标》测定10份水源水样品中菌落总数,依据JJF 1059.1-2012《测量不确定度评定与表示》评定检测结果的不确定度。结果依据所采取的方法,在置信概率为95%时,水源水中菌落总数的扩展不确定度为0.062,10份样品测量结果均在其各自的置信区间范围内。结论本研究建立的方法同样适合类似检测条件下菌落总数不确定的评定。
Objective To assess the uncertainty of the test results of the total number of colonies in source water. Methods The total number of colonies in 10 samples of drinking water was determined according to GB / T 5750.12-2006 Standard for Microbiological Criteria of Domestic Drinking Water. The uncertainty of the test results was evaluated according to JJF 1059.1-2012 “Assessment and Expression of Uncertainty in Measurement”. Results According to the method adopted, when the confidence probability is 95%, the expanded uncertainty of the total number of colonies in water and source water is 0.062, and the measurement results of 10 samples are within their respective confidence intervals. Conclusion The method established in this study is also suitable for the evaluation of the total number of colonies under similar test conditions.