Liquid standard injection, tube impedance and other factors that may cause discrimination during the calibration of TD methods
Application Note 075
It is not uncommon for calibration standards, used during thermal desorption analysis of vapours trapped on sorbent tubes, to be different from field samples.
This application note describes the issues that may arise as a result of differences between samples and calibrants for thermal desorption, and the operating conditions under which these effects may be significant.
Guidance for minimising the impact of such differences (and for validating that a given method is not subject to these effects) is also presented, together with advice on routine monitoring of tube impedance.