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Troubleshooting help on Separation of peaks

vinqc

I am currently working on Calibrating a HP 6890 Series GC.  I am newer to GC (limited to college experience).  I ran close to 20 solvents for my full calibration.  Used a series of four for each solvent ranging from 1mL to 10mL.  Majority of my solvents came out well and had good calibration curves.  However, for two sets of solvents Isopropanol/Ethanol, and Toluene/Normal Propyl alcohol I am having separation issues. I attempted to change the temperature ramping, pressure flows, and even switched the detectors, but with my limited knowledge and not wanting to toy around with too many parts I am unsure what to try next.  Thought about switching the column which is currently a 112-2032 J&W Carbowax/20m but again unsure due to previous statement.  Looking for some advice or just knowledge to help me out.

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    Hello there.  Please see attached. Not sure how well the chromatogram will show, but we achieve separation of ETOH and IPA as well as Tol/NBuOH on a wax.  Our set-up is a bit different than yours, we do a single inlet injection into a dual column set-up.  So we get both a DB-1 and a DB-Wax from the same injection,  I included our parameters and the column information from our method printout.  This is on a 7890, but we ran this method on a 5890 for 20 years, so I know it will work across the various upgrades.  Hope this is of some help.  

     

    Crystal

    attachments.zip
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    Hello there.  Please see attached. Not sure how well the chromatogram will show, but we achieve separation of ETOH and IPA as well as Tol/NBuOH on a wax.  Our set-up is a bit different than yours, we do a single inlet injection into a dual column set-up.  So we get both a DB-1 and a DB-Wax from the same injection,  I included our parameters and the column information from our method printout.  This is on a 7890, but we ran this method on a 5890 for 20 years, so I know it will work across the various upgrades.  Hope this is of some help.  

     

    Crystal

    attachments.zip
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