Samples such as ambient air or standard gas are taken through different injection ports into the dual-channel gas capture system. Then, all the VOCs are efficiently enriched while N2, CO as well other matrices are removed in the first trap under ultralow temperature; in the second, trap, CO2 is removed under normal temperature; in the third trap, VOCs are concentrated under ultralow temperature again, resulting in better performance in separation by GC; finally temperature is increased at the rate of 50℃/s and thus VOCs are quickly delivered into GC-MS and GC-FID for qualitative and quantitative analysis.
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