气相色谱法测定室内环境中16种挥发性有机物含量的不确定度评定

Uncertainty Evaluation of 16 Volatile Organic Compounds in Indoor Environment by Gas Chromatography

采用气相色谱法测定室内环境中的16种挥发性有机物(TVOC),识别和评定测试过程中的不确定度。根据不确定来源,对测量重复性引入的不确定度进行A类评定,对采样体积、标准溶液配制、校准曲线拟合引入的不确定度进行B类评定,合成相对标准不确定度及扩展不确定度。经测定,某室内环境中TVOC质量浓度为16.806 mg/m^(3)±2.336 mg/m^(3),k=2,扩展不确定度为13.9%,校准曲线的拟合是不确定的主要来源。

The 16 volatile organic compounds in indoor environment(TVOC) were determined by gas chromatography.The uncertainties in the test process were discriminated and evaluated.According to the source,measurement repeatability uncertainty was evaluated by class A,while sampling volume,preparation of standard solution and fitting standard curve were evaluated by class B.The standard uncertainty and expanded uncertainty are calculated.The concentration of indoor environment TVOC is(16.806±2.336) mg/m~3,k=2,expanded uncertainty is 13.9%.The main uncertainty component comes from the fitting of standard curve.