11.5 pts) A certain compound was found to have a retention time of 4 5 minutes w

Question

11.5 pts) A certain compound was found to have a retention time of 4 5 minutes when analyzed by GC using tubular capillary GC column I Under otherwise identical conditions how would the use of tubular capillary GC column II have the compound's GC retention time? Tubular capillary GC columns I and II are depicted below 3 Tubular captary GC column olumn wal column wall ? The GC retention time would have been longer than 4.5 minutes a The GC retention time would have been shorter than 4.5 minutes a The GC retention time would have still been 4.5 minutes Page 7 of

Explanation / Answer

With the use of tubular capillary GC column II, retention time of the compound would be shorter than in column I. It is due to the length of the column.

Notice that length of column II is shorter than length of column I. The velocity of the compound across the column is given by:

v = L/TM

Where TM is the retention time and L is the length of column, and the retention time is proportional to lenght, so the answer is:

THE GC RETENTION TIME WOULD HAVE BEEN SHORTER THAN 4.5 MINUTES

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