In GC, What does 'Column condensation test' mean by?

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In GC, What does 'Column condensation test' mean by?..

Answer / sri krishna

Condensation Test
Use this test whenever injector or carrier gas contamination
problems are suspected (e.g., ghost peaks or erratic baselines).

* Leave the GC at 40-50�C for 8 or more hours.
* Run a blank analysis (i.e., start the GC, but with no
injection) using the normal temperature conditions and
instrument settings.
* Collect the chromatogram for this blank run.
* Immediately repeat the blank run as soon as the first
one is completed. Do not allow more than 5 minutes to elapse
before starting the second blank run.
* Collect the chromatogram for the second blank run and
compare it to the first chromatogram.
* If the FIRST chromatogram contains a substantially
larger amount of peaks and baseline instability, then that
is an indication that there is contamination upstream of the
capillary column (ie. contaminated inlet, dirty carrier gas,
etc.).
* If BOTH chromatograms contain few peaks or very little
baseline drift, it can be assumed that the carrier gas
and/or inlet are relatively clean.
* If BOTH chromatograms contain a significant amount of
noise and/or baseline drift, then that usually is an
indication that the detector or detector gases are contaminated.