吹扫捕集-气相色谱法测定水中丙烯腈不确定度评定

Evaluation of Measurement Uncertainty of Acrylonitrile in Water Samples by Purge and Trap-gas Chromatography

根据≤测量不确定度评定与表示≥(JJF1059.1-2012),对吹扫捕集-气相色谱法测定水中丙烯腈进行了不确定度的评定,通过对测量重复性、标准曲线拟合、样品稀释及标准溶液配制、检测仪器产生的不确定度的分析,确定了本实验方法中曲线拟合所引入的相对不确定度最大,标准工作溶液配制引入的不确定度次之,测量重复性引入的不确定度最小。所测的结果为C=(10.0±0.70)μg/L(k=2,p=95%)。

Based on Evaluation and Expression of Uncertainty in Measurement(JJF1059.1-2012),the measurement results of acrylonitrile in water samples by purge and trap-gas chromatography were collected and the measurement uncertainty was evaluated.The impacts of uncertainty degrees of repeatability of measurement,fitting of standard curve,dilution of sample,preparation of solution and testing instrument were analysed.The result indicated that the main factor was fitting of standard curve.The preparation of solutionwas second and the measurement repeatability was last.The result was(10.0±0.70)μg/L(k=2,p=95%).