The Analysis Workflow of the New EPA Method 325 for Fenceline Monitoring

Presented by

Jamie Brown - Supelco R&D Scientist , Lee Marotta - PerkinElmer Senior Field Application Scientist

About this talk

The new EPA METHOD 325 for sampling Volatile Organic Compounds from Fugitive and Area Sources was promulgated in September of 2015. The petroleum refineries have 2 years to comply with the new ruling. Benzene emissions are the focus of the new ruling, but other VOC’s can be monitored using the same sampling tube. The air samples are collected using thermal desorption tubes that are deployed along fenceline of the property and remain deployed for 14 days. The samples are collected passively, without the using of an air sampling pump. After sampling the diffusive endcap is replaced with a metal storage cap and sent to a laboratory where they’re analyzed by thermal desorption gas chromatography. This is the first of a two series presentation that focuses on the analysis side of the workflow. It provides users the steps required to comply with the new EPA fence line regulations and what is needed to optimize the method for high sample throughput. Refineries and testing laboratories will benefit by gaining valuable information on the optimum techniques to perform this method and what it takes to comply. An introduction to the theory and operation of thermal desorption will also be included.

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