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A method for stable carbon isotope ratio and concentration measurements of ambient aromatic hydrocarbons

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Figure

Figure 1. Schematic diagram of the two-stage preconcentration sys-tem.
Figure 3. Plot ofline using TSPS-GC-IRMS. Dashed lines are the reference (offline)xylene offline values is given since the mixtures contained equal13δ δ13C values versus injected mass measured on-C values
Table 1. Averages of background signals for cartridges containing(1 ± 0.2) g of Carboxen and 0.2 to 0.5 g of quartz wool.
Figure 5. Change in δ13C of VOCs collected on cartridges duringstorage for 1 to 2 weeks at ambient temperatures (diamonds) and6 to 7 months in a freezer (circles)
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