How to Comply with New EPA Method 325 for Fenceline Monitoring of Volatile Organic Compounds (VOCs) and Passive Sampling

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A new EPA method for the analysis of toxic compounds in air was promulgated in September of 2015 to protect human health.  EPA method 325 focuses on long term passive sampling for Volatile Organic Compounds (VOCs) at the fenceline from fugitive and area sources.  Benzene emissions are the focus of the new ruling but other VOC’s can be monitored.

Since collection is performed passively onto thermal desorption tubes, an air sampling pump is not required.  The sorbent tubes are deployed along the property fenceline.  After sampling, the diffusive endcap is replaced with a metal storage cap and sent to a laboratory where they are analyzed by thermal desorption gas chromatography. The method allows for either mass spectrometry (MS) or flame ionization (FID) detection.

By viewing this presentation you will learn...

• from the thermal desorption experts utilized by the EPA in the development of method 325 A/B
• valuable information in understanding the theory and implementation of air sampling as well as thermal desorption technology
• optimization of method parameters for fast sample throughput, and the historical development of this new method will be presented