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2.2.6 Secondary (trap) desorption
Sample Tube
Split Tube
Cold Trap
GC
Heated Valve
Pressure and flow
Pressure (flow optional)
Pressure, no flow
KEY
The final stage is secondary trap desorption. The cold trap is heated at a rate of 100°C/s during the first
seconds ensuring rapid desorption of analytes into the carrier gas stream. The flow through the cold trap
at this stage is determined by the column flow and any outlet split.
NOTE: the flow path of UNITY 2 remains in the trap desorption configuration until the trap has cooled
below 50°C.
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