While EPA Method 524.2 does not specifically address dry purge, it is considered a moisture control step and it is permitted. From the standpoint of allowed & non-allowed changes to Method 524.2, we look especially at the following:
Subsection 6.2.2 states “Specifically, the purging time, the purge gas flow rate, and the desorption time may not be changed.”
Those are the parameters that have to be followed as described in the method. There is no specific prohibition against the use of a dry purge step.