Purge-And-Trap Extraction

Schematic diagram of a purge-and-trap system for extracting volatile analytes. The purge gas releases the analytes, which subsequently collect in the primary adsorbent trap. The secondary adsorption trap is monitored for evidence of the analyte’s breakthrough. When the extraction is complete, the VOCs are removed from the primary trap by rapidly heating the tube while flushing with He.

Figure7.25

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