以不确定度的评定为研究内容，介绍了评定不确定度的前期准备工作，通过重量法测定水中悬浮物的不确定度评定与紫外分光光度法测定水中的总氮两个实例，阐述了检测实验室中不确定度的两种评定方法，以供借鉴。%Taking uncertainty evaluation as the research content,the paper introduces preparations of uncertainty evaluation,and describes two uncertainty evaluation methods in detection laboratory through two examples including testing water floating uncertainty evaluation through weigh-ting method and testing total nitrogen in water with spectrophotometry method,with a view to provide some guidance.
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