In the environmental community, PFAS is the acronym for Per- and Polyfluorinated Alkyl Substances. These compounds are associated with manufacturing of items such as Teflon®, Gore-Tex, fire-fighting foams for extinguishing hydrocarbon fires, and other products. PFAS were developed in the late 1940s and have been found in water, solids, and air. Some of the most toxic compounds have been phased out, but others are still in use. Regulators are beginning to ask facilities for emissions data related to PFAS emissions in order to determine the environmental impacts and their effects on human health. Without a promulgated air test method, and no emission standards in place, facilities are beginning to actively seek groups that can provide sample and analysis for these compounds in order to prepare for regulatory actions.

Sampling for PFAS

EPA is currently working on guidance for PFAS emissions testing, which will be known as Other Test Method – 45 (OTM-45). Because many PFAS compounds are considered semi-volatiles, OTM-45 is expected to be similar to an EPA SW-846 Method 0010: Modified Method 5 Sampling Train, but with slight modifications. A few of these modifications include:

  • Modifications to the probe and filter temperatures;
  • ;Method-specific solvent rinses using a Methanol / 5% NH4OH mixture;
  • Addition of a 2nd XAD-2 (breakthrough) resin trap following the water impingers; and
  • Conducting a Proof Blank for analysis.


Alliance Source Testing is the nation’s leader in stack testing and has decades of experience with volatile and semi-volatile organic sampling systems. Since the mid-1990’s, Alliance Source Testing and its legacy companies have conducted hundreds of test programs that utilized the SW-846 Method 0010 sampling train, for the determination of semi-volatile compounds. Most of these test programs involved large-scale testing events with multiple isokinetic sampling systems operating simultaneously. As recently as 2020, Alliance Source Testing has provided PFAS sampling services to clients involved in carbon regeneration and landfill disposal. These sampling projects involved the newly developed PFAS standard operating procedures and techniques vetted by experts in the analytical community. In addition, Alliance Source Testing partners with Eurofins TestAmerica for PFAS analysis. Eurofins TestAmerica is a leader in stack testing analysis and has been instrumental in the development of OTM-45 sampling and analysis methodologies. This partnership demonstrates our commitment to assembling the strongest PFAS team in order to meet the objectives of our clients.  

As we enter the new year, Alliance Source Testing continues to prepare for multiple PFAS projects in 2021 and beyond. If you would like to discuss how Alliance Source Testing can assist you with your PFAS emissions testing, please contact us at  


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