Patented Quantitative Passive VOC Soil-Gas Monitoring with the Waterloo Membrane Sampler™

Patented Quantitative Passive VOC Soil-Gas Monitoring with the Waterloo Membrane Sampler™

Date and Time: Thu, Jun 24, 2021 1:00 PM - 2:00 PM EST
Presenters:  Brent G. Pautler, Ph.D. and Todd McAlary, Ph.D., P.Eng. (ON, BC), P.G. (NC), CUT
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Passive sampling has been growing in popularity for the measurement of volatile organic compounds (VOCs) due to lower costs, simpler sampling protocols and ease of deployment, with applications ranging from indoor/outdoor air quality and soil vapor intrusion assessments. The Waterloo Membrane Sampler™ (WMS™), a passive permeation sampler which incorporates a polydimethylsiloxane membrane across the face of a vial filled with sorbent medium, provides additional advantages such as a high resistance to water vapor and predictable uptake rates for virtually any VOC. It has found use in collecting time-weighted average quantitative results for soil gas and vapor intrusion projects for risk assessment and/or monitor remediation projects. This presentation will provide technical information on the WMS™ and provide data on sampler developments including the use of WMS™ in soil gas sampling programs in which the design of the sampler was modified to incorporate a thicker membrane, reducing the potential for “starvation”, a common issue when collecting soil gas samples with passive samplers. The benefits relative to the conventional Summa Canister/TO-15 methods of sampling and analysis will also be introduced.

Event Properties

Event Date 06-24-2021
Cut off date 06-24-2021
Individual Price Free
Location Online Webinar
Attachment SERVICE AREA_WMS Sewer Gas_2021.pdf
SERVICE AREA_WMS_Passive SGS with WMS_2020.pdf
SERVICES AREA_ WMS soil gas cut sheet_2020.pdf


Brent G. Pautler, Ph.D.

Chemistry Services Manager, SiREM

Brent is the Chemistry Services Manager at SiREM and an environmental analytical chemist with advanced technical experience in analytical chemistry, passive sampling, spectroscopy, and chemistry informatics. Throughout his career, he has worked with scientists, engineers, and consultants, applying his chemistry and information technology expertise to help them solve unique problems in the laboratory and the field. He is focused on managing SiREM’s chemistry services and supporting SiREM’s bioaugmentation customers while advancing SiREM’s passive sampling portfolio.

Todd McAlary, Ph.D., P.Eng. (ON, BC), P.G. (NC), CUT

Practice Leader – Vapor Intrusion Services, Geosyntec Consultants, Inc.

Dr. McAlary has been the Practice Leader for Vapor Intrusion Services at Geosyntec Consultants, Inc. for 22 years and recently completed a Doctoral degree with passive sampling as his dissertation subject. He has 32 years of consulting experience, a certificate in university teaching and is an Adjunct Professor at the University of Toronto.