预浓缩系统-全二维气相色谱-飞行时间质谱分析环境空气中挥发性有机物

Preconcentration System — Comprehensive two-dimensional Gas Chromatography — Time of Flight Mass Spectrometry Analysis of Volatile Organic Compounds in Ambient Air

采用SummA罐采集样品,自动进样器进样,三级冷阱预浓缩样品,全二维气相色谱/飞行时间质谱法(GC×GC/TOFMS)测试分析,以较长的非极性柱Rxi-5MS(60m×320μm×1.0μm)作为第一维柱,较短的中等极性柱DB-17MS(2.0×0.1mm×0.1μm)作为第二维柱,对环境空气中的VOC成分进行了定性定量分析。通过考察方法的线性范围、精密度、加标回收率、检出限与《空气和废气监测分析方法》(四版)给出的两个方法比较,证实该方法特性不仅满足方法学要求,而且能够更加准确快速监测环境空气中VOC。

The method used SummA canister sampling, automatic sample, three cold trap preconcentration sample and GC x GC/TOFMS detector to analyse VOC qualitatively and quantitatively. The chromatographic column systems were a longer non - polar column Rxi-SMS（60 m × 320μm×1. 0 μm）as the first dimension column and a short medium polarity column DB-17MS （2.0 m ×0.1 mm× 0.1 μm） as a second dimensional column. Through the investigation of methods of linear range, precision, recovery rate, detection limit and ＂monitoring of air and waste gas analysis＂ （four edition） is given by two methods, the method can satisfy the re- quirements of characteristics method, and monitor VOC in ambient airquiekly and accurately.