2
Concepts of 2D-LC
Active Solvent Modulation (ASM)
2D-LC User Guide
42
Understanding the ASM Factor
The principle of ASM is diluting
1
D sample loop solvent with
2
D solvent.
The ASM solution achieves this dilution by a parallel flow of solvents via sample
loop and ASM capillary.
Figure 23
Principle of active solvent modulation (schematic view)
The flow rates
F
through these parallel capillaries depend on the different
backpressures
p
of the capillaries in use. The backpressure of a capillary
depends on the capillary length
l
, radius
r
to the power of 4, and the viscosity
of
the solvent.
The Hagen-Poiseuille equation describes the relation of these parameters.
Hagen-Poiseuille equation
Different ASM capillary lengths have an effect on
the following parameters:
•
Capillary back pressure
•
Dilution factor
•
Optimum dilution for different applications
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