Agilent Technologies 7697A - Page 32

32 Advanced Operation
3 Method Development
Controlling the phase ratio
Another factor to manipulate to increase sensitivity is the
phase ratio, V
G
/V
L
. Recall the vapor phase concentration
equation:
Where K is small, reducing the phase ratio will produce a
higher concentration of analyte in the headspace volume.
The 7697A can use a variety of sample vials. Select a sample
vial and sample amount to create a higher concentration of
analyte.
Where K is large, reducing the phase ratio results in less
gain.
C
G
=
C
O
K +
V
G
V
L