A large number of analytical methods require concentrations of test gases to be measured in real-time using validated procedures. Unfortunately, many of these methods have only been developed for aqueous samples.  Getting the air/vapor into a liquid for detection can be problematic.  A new method for accomplishing air/vapor sample collection and transport has been achieved through the use of denuder technology.  Denuders are like continuous impingers using gas injection technology to continuously introduce a gas/aerosol into a solvent stream where the analyte is taken into a �trapping� solution.  The trapping solution is delivered to the denuder using a HPLC pump.  Airflow from 1-10 L/min is obtained using a mass flow controller and a vacuum source.  This vacuum source draws sample air into the denuder where the gases and aerosols are extracted into the trapping solution for detection. This presentation describes two different applications of the denuder to demonstrate gas/aerosol detection.

Denuder based real-time air monitoring methods

245th National Meeting (2013)

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