2019 Sediments Conference | Maxxam Analytics Maxxam Analytics

2019 Sediments Conference

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The Sediments Conference is a forum for sharing research results, practical experiences, and opportunities associated with investigating, remediating, and restoring the environmental and economic vitality of waterways. Meet with our environmental experts at booth #143 from February 11-14, 2019.

Maxxam’s Research and Development Manager, Heather Lord, will also be presenting on PFAS Dark Matter: er- and Polyfluorinated Precursors in Soil and Water on February 14 at 11:20am.

Register here.

PFAS Dark Matter: Per- and Polyfluorinated Precursors in Soil and Water
Heather L. Lord (hlord@maxxam.ca) Pasquale Benvenuto and Taras Obal (Maxxam, Mississauga, ON, Canada).

Background/Objectives
Per- and polyfluorinated alkyl substances (PFAS) are ubiquitous, persistent, anthropogenic chemicals that bioaccumulate in both humans and biota. The toxicity of certain PFAS such as perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) has been observed in some rodent studies and the potential for deleterious effects in humans is suspected. In response to the greater understanding of the prevalence and environmental impact of these compounds that has developed recently, contaminant guidelines for selected PFAS in environmental matrices have been introduced in many jurisdictions.

While significant effort has been focused on identifying high priority impacted sites and delineating the extent of PFAS contamination, an additional consideration that is expected to influence remediation efforts is the potential for in situ oxidative transformation of PFAS precursor compounds to the current terminal PFAS of concern. The transformation of precursor compounds to terminal PFAS of concern introduces potential additional risk and liability at impacted sites. The pool of potential precursor compounds is large and poorly characterized. As a result it is difficult for stakeholders to quantify, assess and/or mitigate the potential risk posed by the presence of these precursor compounds.

Approach/Activities
In 2012 Erika Houtz and David Sedlak of the University of California, Berkeley published a laboratory-based oxidative conversion of PFAS precursors in water by persulfate thermolysis. By measuring a standard suite of terminal PFAS from the same sample before and after oxidation, the presence of a potential PFAS precursor pool could be determined.
Maxxam Analytics has implemented the assay as published for water samples. A parallel assay to measure the presence PFAS precursor compounds (often referred to as PFAS “dark matter”) in contaminated soils and sediments has been developed and validated by Maxxam.

Results/Lessons Learned
During this presentation, we will share our experiences and “lessons learned” during the implementation and verification of the total oxidizable precursors assay for water; and the development and validation of a reliable method for soils and sediments, including:

  • Precursor conversion efficiencies and changes to chromatographic peak patterns;
  • Impacts of sample heterogeneity on assay results and recommendations for controlling this impact;
  • Laboratory quality assurance including sample hold time studies for both soil and water;
  • Advantages and limitations of the methods.

Date/Time
Date(s) - 11/02/2019 - 14/02/2019
All Day

Location
Hilton New Orleans Riverside



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Donna Garbutt, M.B.A. Chief Executive Officer Maxxam is the Canadian market leader in analytical services and solutions to the energy, environmental, food and DNA industries and a member of the Bureau Veritas Group of companies – a world leader in testing, inspection and certification services. We support critical decisions made by our customers through the application of rigorous science and the knowledge and expertise of our over 2200 employees. Our annual Corporate Responsibility Report outlines our efforts to continually improve our business performance and practices. Its publication is an industry first and an integral part of our commitment to success with responsibility. LinkedIn
Maxxam Analytics Maxxam is the Canadian market leader in analytical services and solutions to the energy, environmental, food and DNA industries and a member of the Bureau Veritas Group of companies – a world leader in testing, inspection and certification services. We support critical decisions made by our customers through the application of rigorous science and the knowledge and expertise of our over 2200 employees. Our annual Corporate Responsibility Report outlines our efforts to continually improve our business performance and practices. Its publication is an industry first and an integral part of our commitment to success with responsibility.
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Phone: (905) 288-2150