In this webinar we were pleased to have as a special guest speaker Elizabeth Denly, PFAS Initiative Leader & Chemistry Director at TRC. Her presentation discussed using forensics to identify sources of PFAS. She was joined by Maureen Dooley, Vice President – Industrial Sector at REGENESIS, who discussed the latest developments about colloidal activated carbon's use in the remediation industry as a low-cost method of eliminating PFAS risk.
Highlights of this free webinar:
The efficacy and limitations of using PFAS analytes as fingerprints for source identification
Demonstrating the challenges of source identification due to chemical signatures from samples collected at numerous PFAS source areas
Use of chemical signatures in combination with fate and transport mechanisms for PFAS source identification
对典型个体的相对组成的评价al PFAS compounds in surface water and groundwater samples can be an effective method to identify the source(s) of PFAS in these media. The list of PFAS compounds that laboratories are able to detect, and the list of analytes required by various regulatory agencies continues to expand. As a result, the number of compounds that can be used to “fingerprint” samples is variable with time and with location. Comparison of chemical fingerprints in samples collected from surface water bodies and groundwater located downstream and downgradient of contaminated sites may appear to be the same simply because of the suite of analytes chosen for fingerprinting. Chemical signatures in combination with fate and transport mechanisms (e.g., commingling, persistence, sorption, dilution) must be considered during source identification. Using literature-based data and data collected by the authors, chemical signatures from samples collected at numerous PFAS source areas demonstrate how identification of sources can be challenging. Attendees will learn about the efficacy and limitations of using PFAS analytes as fingerprints for source identification and delineation.
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About the Presenter:
Elizabeth Denly
PFAS Initiative Leader & Chemistry Director, TRC
Ms. Denly serves as TRC’s per- and polyfluoroalkyl substances (PFAS) Initiative Leader & Chemistry Director. As a project QA chemist at TRC, Ms. Denly is responsible for providing quality assurance (QA)/quality control (QC) oversight in support of different environmental investigations, including remediation programs, ambient air monitoring, and human health/ecological risk assessments. Ms. Denly is currently serving on the Interstate Technology and Regulatory Council (ITRC) PFAS team, is a co-leader on the PFAS Naming Conventions sub-team, and won the 2017 ITRC Industry Affiliates Award for her contributions to this team. She currently works on many different types of PFAS investigations with a specific focus on chemistry, sampling procedures, data interpretation, forensics, QA/QC, and analytical methodologies. She has recently collaborated with laboratories on research activities including (1) evaluation of the leachability of PFAS from environmental sampling products; (2) evaluation of analytical approaches (isotope dilution liquid chromatography/dual mass spectrometry, total oxidizable precursor assay, and total fluorine) on samples collected from aqueous film forming foam sources and paper mill sources; (3) evaluation of the solubility of perfluorooctane sulfonic acid; and (4) evaluation of sampling/analytical approaches for the measurement of PFAS in ambient air. Her major areas of expertise include emerging contaminants, data evaluation, quality assurance project plans, data usability assessments, field and laboratory audits, and consulting for regulatory agencies.
Maureen Dooley
Vice President - Industrial Sector, REGENESIS
Maureen Dooley has over twenty-five years of experience in many aspects of remediation industry, including project management, research and development, senior technical oversight, remedial design and laboratory management. Her prior experience includes the completion of numerous treatability studies designed to evaluate the biodegradation of a wide range of chemical constituents that include chlorinated solvents, petroleum hydrocarbons, explosives, aromatic hydrocarbons and pesticides. In her current role at REGENESIS, she provides technical leadership for complex soil and groundwater remediation projects, including PFAS groundwater contamination treatment, throughout North America, as well as remediation design, strategy, and business development in the northeastern United States and eastern Canada.