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Author Question: Suppose an organic compound has a higher heat conductivity than the carrier gas. How would its GC ... (Read 10 times)

cherise1989

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on: Aug 23, 2018

Suppose an organic compound has a higher heat conductivity than the carrier gas. How
  would its GC signal appear on a chromatogram run on an instrument with
  (a) a thermal conductivity detector?
  (b) a flame ionization detector?



Question 2

Alcohols have very long retention times on Carbowax columns. Why? (Hint: Consider the
  polarity of alcohols.)



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orangecrush

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Reply #1 on: Aug 23, 2018
Answer to Question 1

(a) The signal will appear as a dip from the baseline instead of a peak rising from the baseline
because the sample arm becomes cooler (instead of hotter) relative to the feference arm in
the Wheatstone bridge.
(b) The signal will appear as a normal peak because a flame ionizaiton detector is not affected
by thermal conductivity.



Answer to Question 2

Alcohols can form hydrogen bounds with the oxygen atoms in a Carbowax.


cherise1989

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Reply #2 on: Aug 23, 2018
TY


orangecrush

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Reply #3 on: Aug 23, 2018
You're welcome


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