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Particle geometry and time of elution

http://chromforum.org/viewtopic.php?t=103944

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Particle geometry and time of elution

Posted: Tue Apr 21, 2020 3:58 pm
by Venusroulette
Hello,
I'm new with GC technique. Can you tell me why is there a difference between the retency time with n-butane and isobutane?I can't find anything I have two peaks and I'm not sure which one is n-butane and which one is isobutane. What determine the difference? :?: :?: :?:
Thank u very much!

Re: Particle geometry and time of elution

Posted: Tue Apr 21, 2020 4:16 pm
by Venusroulette
In addition, we use DC200 in that measurement

Re: Particle geometry and time of elution

Posted: Tue Apr 21, 2020 8:52 pm
by tom jupille
Other things being equal, on a non-polar stationary phase, the order of elution is dominated by volatility of the analyte, so I would expect isobutane (BP = -12 deg C) to elute before n-butane (BP = -1 deg C).

Re: Particle geometry and time of elution

Posted: Wed Apr 22, 2020 7:12 am
by Venusroulette
Thank u very much!
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