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Part 2.5 - PFAS: Data Defensibility and Usability

Part 2.5 - PFAS: Data Defensibility and Usability

Tuesday, August 27, 2019

About This Webinar:

The chemistry and analysis of PFAS is unique and challenging. There is currently no consensus method for all environmental matrices or all target analytes. For all matrices other than finished drinking water, a 537 Modified method, using isotope dilution, is commonly used and is widely accepted as the gold standard in quantitation for challenging contaminants such as these.

The USEPA published Method 537 in 2008 with a recent update in 2018. This method is applied to drinking water matrices only. Several other methods have been published for PFAS in non-potable and solid matrices including ISO Method 25101, ASTM D7979 and D7968. EPA is in the process of validating a number of SW-846 methods with various analytical techniques and parameters for different matrices. The Department of Defense (DoD) has compiled rigorous quality assurance criteria for PFAS testing under Table B-15 of the Quality Systems Manual (QSM). In order to meet client needs, environmental laboratories have adopted Method 537 and developed modifications to address non-potable water and solid matrices. The inconsistent adoption of these modifications yields opportunity for data variability over time and between labs. This soup of methods and analytical approaches has left stakeholders with the challenging job of navigating their options to make the right choice for their project objectives. Once the data have been reported the task of data review and validation begins and that process can feel somewhat daunting when it comes to this unique class of chemicals.

Taryn McKnight aims to provide clarity through a comparison of methods and a discussion about analytical parameters and their potential impact on data quality. An update on what is currently available in terms of published methods versus methods under development will be provided as well.

Elizabeth Wessling of MECX will take us on a deeper dive into data usability and data validation. This begins with the Data Quality Objectives process, where understanding the appropriate analytical approach to apply comes into play. She will take us through a review of 537.1 and DoD QSM 5.3 Table B-15 data and what to look for when processing these specific data sets.

Topics the Presentation Will Cover Include:

- Methods Comparison – what is available today and what is under development
- The use of isotope dilution – what does this mean?
- Quality control measures and the impact on data quality
- Data Quality Objectives – EPA Seven Step Process
- Data Review – 537.1 and DoD QSM 5.3 Table B-15
- Field Sampling Considerations in Data Review

A question and answer session will immediately follow the presentation. At the conclusion of each webinar, you will be asked for your feedback and opinions for future webinar topics to be developed by TestAmerica.

August 27, 2019 


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PDH Credit:

All webinar attendees will receive a certificate of attendance with PDH Credit issued by Eurofins TestAmerica. Certificates will be emailed two days following the presentation. Contact your state to determine whether these credits meet the guidelines set forth by your state's board.

The Presenter:

Taryn McKnight

PFAS, Air, Vapor Intrusion

Product Manager, Eurofins TestAmerica

Elizabeth Wessling


Senior Vice President, MECX

To view a recorded version of this webinar, please contact patricia.mcisaac@testamericainc.com.