I have a 6890 GC-ECD with a dual column set up.  I am getting a peak coming up on only one of my columns when i run a blank, and this peak is very close to the retention time of my one analyte.  I did the no injection blank, and the peak still shows on just the one column so it is coming from the instrument and not an outside source.  Can anyone suggest what i should do to try to fix my problem?

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