吹扫捕集-气质联用法测定水中甲基叔丁基醚的不确定度评定

Evaluation of Uncertainty in Determination of Methyl Tert-Butyl Ether in Water by Purge Capture-GMS

依据JJF1059-2012《测量不确定度评定与表示》,对吹扫捕集气相色谱-质谱法测定水中MTBE浓度的不确定度进行了评估。分析了水质中MTBE测定过程中影响不确定度的各种分量,评定了分析过程中影响较大的不确定度分量,计算了合成不确定度及相对扩展不确定度。当样品中MTBE的含量为3.52μg/L时,检测结果表示为3.52±0.77μg/L。

according to JJF1059-2012《uncertainty assessment and representation of measurement》,the uncertainty of MTBE concentration in water was evaluated by gas chromatography-mass spectrometry.All kinds of components affecting uncertainty during MTBE determination in water quality are analyzed.The large uncertainty components are reasonably evaluated and the synthetic uncertainty and relative extended uncertainty are calculated.When the MTBE content in the sample is 3.52μg/L,the test results are expressed as 3.52±0.77μg/L.