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基于气质联用技术,采用二次热解析法作为样品前处理方法,建立了一种能够快速、准确地识别电缆隧道环境空气中有害物质,并对其进行定量分析的检测方法。结果表明,电缆隧道环境空气中所含有的挥发性有机物主要为苯系物,包括苯、甲苯、乙苯、二甲苯及苯乙烯等,方法对于此五种组分的相对标准偏差在2.15%~2.81%之间。方法具有简单、快速、准确度高等优点,可运用于电缆隧道等环境空气中微量苯系物的定性及定量分析。
Based on GC / MS, the method of secondary thermal analysis was used as sample pretreatment method to establish a detection method that can quickly and accurately identify harmful substances in the ambient air of cable tunnels and quantitatively analyze them. The results show that the relative standard deviation of the five components in the cable tunnel ambient air is mainly benzene, including benzene, toluene, ethylbenzene, xylene and styrene. The relative standard deviation of this method is between 2.15% 2.81% between. The method has the advantages of simple, rapid and high accuracy, and can be applied to qualitative and quantitative analysis of trace benzene series in ambient air such as cable tunnels.