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Part 3 - PFAS: Data Defensibility and Usability

Part 3 - PFAS: Data Defensibility and Usability

Tuesday, March 3, 2020 - 1:30 P.M. ET

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. An additional drinking water method, 533, was published at the end of 2019. 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 methods with various analytical techniques and parameters for different matrices. A number of states have established their own analytical method requirements to combat the concerns regarding variability in analytical approaches. 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.
Charles Neslund of Eurofins Lancaster will take us on a deeper dive into data quality and usability considerations. This begins with what little published criteria we have. We will review the criteria outlined in EPA published method 537.1 as well as the criteria outlined in the DoD QSM Table B-15. Charles will provide a critical look at the potential impact of these criteria on data quality.

We hope you will walk away from this presentation with clarity regarding the methods conundrum and a higher comfort level around evaluating the usability and defensibility of PFAS data.

Topics the Presentation Will Cover Include:

  • Methods Comparison – what is available today and what is under development
  • Key analytical techniques and their impact on data quality
  • Quality Assurance Criteria - 537.1 and DoD QSM 5.3 Table B-15
  • Quality control measures and the impact on data quality

A question and answer session will immediately follow the presentation. 

March 3, 2020 - 1:30 P.M. ET


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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 on Friday 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


Product Manager, Eurofins TestAmerica


Charles Neslund


Technical Officer, Eurofins Lancaster  

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