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The phase ratio (β) is defined as the relative volume of the headspace compared to volume of the sample in the sample vial.
Phase Ratio (β) = Vg / Vs
where:
Vs is the volume of sample phase
Vg is the volume of gas phase
Lower values of β (i.e. larger sample size) will yield higher responses for volatile compounds.
Decreasing the β value will not always yield the increase in response needed to improve sensitivity.
When β is decreased by increasing the sample size, compounds with high K values partition less into the headspace compared to compounds with low K values and yield correspondingly smaller changes in Cg.
Samples that contain compounds with high K values need to be optimised to provide the lowest K value before changes are made in the phase ratio.
