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首页> 外文期刊>Journal of chromatography, A: Including electrophoresis and other separation methods >Screening method for the determination of 28 volatile organic compounds in indoor and outdoor air at environmental concentrations using dual-column capillary gas chromatography with tandem electron-capture-flame ionization detection
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Screening method for the determination of 28 volatile organic compounds in indoor and outdoor air at environmental concentrations using dual-column capillary gas chromatography with tandem electron-capture-flame ionization detection

机译：双柱毛细管气相色谱-串联电子捕获-火焰电离检测法测定环境浓度下室内和室外空气中28种挥发性有机物的筛选方法

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摘要

A gas chromatographic method is presented for the simultaneous determination of 28 volatile organic compounds (VOCs) in indoor and outdoor air at environmental concentrations. Using diffusive (passive) samplers, the VOCs were adsorbed onto charcoal during a four-week sampling period and subsequently desorbed with carbon disulphide. After injection, using a cold split-splitless injector, the mobile phase was split via a Y-connector and led onto two capillary columns of different polarity switched in parallel. This dual-column configuration provides additional information about the VOC components and can be obtained for verification purposes. Detection was in both cases performed by connecting each column with a non-destructive electron-capture detector and a flame ionization detector switched in series. By this procedure sensitivity is increased because no effluent splitting is required. At the same time, sample throughput is enhanced drastically since several items of information are obtained simultaneously. The procedure has been successfully applied in the context of a large field study to measure outdoor air concentrations in three areas with different traffic density. It is applicable to indoor air measurements in like manner.
机译：提出了一种气相色谱法，用于在环境浓度下同时测定室内和室外空气中的28种挥发性有机化合物（VOC）。使用扩散（被动）采样器，在四周的采样期内，VOC被吸附到木炭上，随后被二硫化碳解吸。进样后，使用冷不分流进样器，将流动相通过Y型连接器分流，并引入并联切换的两根极性不同的毛细管柱上。这种双列配置提供了有关VOC组件的其他信息，可以出于验证目的而获得它。在两种情况下，均通过将每根色谱柱与无损电子捕获检测器和串联的火焰电离检测器连接来进行检测。通过该程序，由于不需要废水分离，因此提高了灵敏度。同时，由于可以同时获取多项信息，因此可以大大提高样品通量。该程序已成功应用于大型现场研究，以测量三个交通密度不同区域的室外空气浓度。同样适用于室内空气测量。

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