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PFAS in Source and Ambient Air, Part 6

Event Announcement

Tuesday, Apr 6, 2021

About This Webinar:

When we look at treatment and disposal options for PFAS, we are often looking at thermal remediation and incineration. With this process we must monitor the destruction efficiency of the target compounds of concern and monitor the stack gas for what is being emitted into the ambient air. We also need to be mindful of what is occurring at facilities where PFAS chemicals are part of the manufacturing process.

PFAS have unique chemical and physical properties, requiring special consideration when designing a sampling and analytical process for evaluating these chemicals in ambient air or source air emissions. The standard EPA testing methods provide the foundation for establishing defensible testing processes. However, significant compatibility issues arise when the performance of current test methodology is expected to align with traditional method performance standards and data quality objectives (DQOs).

The term PFAS represents a broad class of chemical characteristics. Depending upon those characteristics different media, technology and procedures must be employed to effectively capture, recover and produce representative results. In addition, the ubiquitous nature of these chemicals proves a unique challenge for detecting ultra-trace levels of PFAS in ambient air. Background artifacts must be removed or resolved from what is site specific contamination.

For example, several PFAS compounds of interest have boiling points within the USEPA’s semi-volatile range while also exhibiting significant acid/base chemistry. Consequently, the solvents employed for the traditional handling of semi-volatile compounds are inadequate. On the other hand, Fluoroether E-1 is a volatile PFAS compound that displays very little affinity for the conventional Tenax® resin used in EPA Method 0030, and the standard EPA volatile sampling method is prone to severe breakthrough issues. However, this compound and others can successfully be characterized using a Modified Method 18.

April 6, 2021