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2.2.3 Prepurge
Sample Tube
Split Tube
Cold Trap
GC
Heated Valve
Pressure and flow
Pressure (flow optional)
Pressure, no flow
KEY
Each tube must be purged thoroughly with carrier gas to remove air before heat is applied. Even the
smallest trace of oxygen could result in sorbent and possible analyte oxidation, generating artifacts and
compromising data quality.
There is also the option in this step to perform an elevated temperature purge. See Section 3.6.4.
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