G^.A^.S recently demonstrated the analysis of BTEX at low ppb level, using CompactGC equipped with PID (photo ionisation detector). The sample is injected directly onto the column, without pre-concentration. In this case, a run to run time of only 60 seconds is needed. The chromatogram shows BTEX at 100 ppb level; the detection limit is 2-5 ppb, depending on the component.

In combination with the optional pre-concentration trap, ppt levels are analysed.

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