气候箱法测定家具VOC释放量的不确定度

Uncertainty Assessment of VOC Emission from Furniture by Climate Chamber Method

采用VOC气候箱法和气相色谱-质谱法(GC-MS)对家具产品中释放的挥发性有机化合物(VOCs)进行测定,对不确定度进行量化和评定。随着分析技术的快速发展,社会对测量精度和准确性要求越来越高,但由于受测量工具和环境因素等干扰,测量值与真实值存在一定偏差,而测量不确定度给出测定结果的合理范围,提高了测量结果对样品进行评定的准确性。VOC释放量不确定度测定中引入不确定度的因素有多个,如:采气过程、标准曲线拟合、标准物质、VOC气候箱内部环境、重复性测定过程等。以甲苯作为典型化合物分析,家具的甲苯释放量为0.0136mg/m^(3)时,扩展不确定度为0.0042mg/m^(3)。分析结果表明,标准曲线拟合和VOC气候箱内部环境产生的不确定度是主要因素。

VOC climate chamber method and gas chromatography-mass spectrometry(GC-MS)were used to determine the volatile organic compounds(VOCs)released in furniture products,and the uncertainty was quantified and evaluated.With the rapid development of analysis technology,the measurement accuracy and accuracy requirements are getting higher and higher,due to the interference of measurement tools and environmental factors,there is a certain deviation between the measured value and the real value,and the measurement uncertainty gives a reasonable range of measurement results,which improves the accuracy of the measurement results to evaluate the sample.There are many factors that introduce uncertainty in the determination of VOC release uncertainty,such as:gas recovery process,standard curve fitting,reference materials,VOC climate chamber internal environment,repeatability measurement process,etc.Using toluene as a typical compound,the extended uncertainty was 0.0042 mg/m^(3)when the toluene emission of furniture was 0.0136 mg/m^(3).The analysis results show that the standard curve fitting and the uncertainty generated by the internal environment of the VOC climate chamber are the main factors.