van deemter

[chembot]

What's the optimized linear velocity and corresponding minimum H for capillary GC and packed bed GC? Trying to do some theoretical seps
optimization. Thanks!

Mike

[chromatographer1]

optimized for separation or separation per time?

for separation using helium carrier, the general concensus is about 20cc/min linear flow.

for GLC with packed columns it is a difficult question, but I thinik most would say that 20cc/min for a packed 2mm ID column, 80cc/min for a 4mm ID column, with 5cc/min for a 1mm ID column is optimum.

Gas solid packed column chromatography is another matter altogether.