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2.2.4 Primary (tube) desorption
Sample Tube
Split Tube
Cold Trap
GC
Heated Valve
Pressure and flow
Pressure (flow optional)
Pressure, no flow
KEY
At the start of primary (tube) desorption the tube oven begins to heat (either from ambient or from the
temperature of the optional elevated temperature purge if selected). Note that the tube desorption time is
measured from the beginning of tube oven heating and not from the time at which the sample tube
reaches the desorption temperature.
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