气相色谱法测定环境空气中苯系物的不确定度分析

Analysis of Uncertainty in Determination of Benzene in Ambient Air by Gas Chromatography

对环境空气中苯系物的监测进行不确定度分析,有助于提高环境空气监测的准确度,为找出影响环境空气中苯系物检测的干扰因素,以采取相关措予以解决,最大程度地减少不确定度,提高检测的准确度。本文依照JJF1059-1999《测量不确定度评定与表示》,进行了固体吸附/热脱附-气相色谱法测定环境空气中苯系物的不确定度分析,包括标准溶液、各种量器、标准工作曲线拟合、重复测定样品、采样过程中5个方面。结果显示,不确定度占比最大为重复测定、采样过程、各种量器引引入。可见为了减少不确定度,一方面要提高操作人员的操作技术,另一方面要规范采样流程,最大程度降低不确定度,以提高检测准确性。

The uncertainty analysis of benzene series monitoring in ambient air can promote the improvement of the accuracy of ambient air monitoring.To minimize uncertainty and improve the accuracy of detection.The uncertainty analysis of benzene series in ambient air by solid adsorption/thermal desorption-gas chromatography was carried out according to JJF1059-1999《uncertainty evaluation and representation》.The largest proportion of uncertainty was repeated determination,sampling process and introduction of various gauges.In order to reduce the uncertainty,on the one hand,it is necessary to improve the operation technology of the operator,on the other hand,to standardize the sampling process and to minimize the uncertainty in order to improve the accuracy of the detection.