Page 88 - Illustrated Pocket Dictionary of Chromatography
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84 FLOW PATH
This is an electrical flow meter (with low batteries!). The tube is connected to a
by-pass port on the GC, and the flow rate is read directly from the face.
flow path Describes the exact route a molecule follows as it elutes
through a column. The existence of multiple flow paths is a con-
tributing factor to peak broadening (eddy diffusion).
flow rate, F A measure of the speed at which the mobile phase is
traveling through the system. In HPLC work flow rates typically range
from 0.5 to 2mL/min, in SEC from 0.5 to 5mL/min, in capillary GC
from 0.1 to 1mL/min, and for packed-bed from GC 75 to 90mL/min.
flow resistance parameter, F The flow resistance parameter is
dimensionless and is calculated from the specific permeability, B o , and
the particle diameter, d p :
