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Chemistry LibreTexts

GC: Temperature Influence

  • Page ID
    283950
  • Exercise – Gas Chromatography

    1. Temperature is the most easily controlled factor influencing separation in GC. Consider the isothermal (45 °C) gas chromatogram below. 

      Chromatogram_Gas.png

      1. What’s the problem with this separation?


         

      2. Estimate the retention factor (k) for peak #5.


         

      3. How would you change the isothermal temperature conditions to improve the retention factor for peak #5? Draw the resulting chromatogram with peaks labeled.




         

        Chromatogram_Blank.png

      4. What would be the downside to the change you proposed in part (c)? [Hint: consider what happens to peaks #1-4]

     

     

     

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