By Anonymous on Wednesday, February 12, 2003 - 09:03 am:
Folks-
I have a 30m x 0.53mm i.d. column. Is 5 mL/min helium a typical flow rate to use? My oven is at 120C isothermal.
Thanks,
Jeff
By Anonymous on Wednesday, February 12, 2003 - 12:12 pm:
That's a good starting point
By Leon on Thursday, February 13, 2003 - 01:18 pm:
The default flow rate of helium in a capillary column that would most likely lead to the best separation-speed tradeoff can be found as
F(mL/min) = 8*ID(mm)
where, F is the flow rate in mL/min, and ID is column internal diameter in mm. For a 0.32 mm column of any length, this formula gives flow rate of 2.56 mL/min.
For more details, including default flow rates of hydrogen and nitrogen as well as default heating rates in temperature-programmed analyses, check my November 3, 2002 - 12:04 pm message. (On Home Page of this Chromatography Forum, click Discussion: Tree View. On the Tree View Page, choose Chromatography Forum: GC Message Board: Temperature programming for hydrocarbons.)
Leon
By Anonymous on Friday, February 14, 2003 - 07:54 am:
Anonymous and Leon -
Thanks for the info.
-Jeff
By Bernd Mischke on Friday, March 28, 2003 - 12:02 am:
Send me Your email address and You will get a sheet with all nessesary flows in capillary columns, don't forget that PLOT and WCOT columns differ in flows!!!