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Vial Eq. Time (vial equilibration time) Time the vial spends in
the oven heating the sample. The proper length of time depends
on the type of sample (solid, liquid), the amount of sample, and
the partition coefficient of the analytes. In most cases, the vial
equilibration time should be long enough to reach equilibrium
in the vial.
Pressuriz. Time (pressurization time)
Time during which the vial pressurization gas is introduced into
the sample vial to build up additional pressure in the vial.
Loop Fill Time Time in which the headspace/vial pressurization
gas mixture passes through the sample loop to vent. This fills
the sample loop with a precise amount of headspace gas.
Loop Eq. Time (loop equilibration time) Time after the vent valve
closes to allow the analytes in the sample loop to equilibrate to
the higher loop temperature and to allow pressure and flow in
the loop to stabilize.
Inject Time Time in which the gases in the sample loop are
injected into the GC. This time must be sufficient for complete
sample transfer. If the time is too short, the analysis will lose
sensitivity because not all the sample will be transferred. It is
not a problem if the time is longer than necessary. The actual
time needed depends on the carrier flow rate and the sample
loop size.
medium_standard.book Page 55 Tuesday, February 17, 2004 10:14 AM
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