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Waterloo Membrane Sampler™

SiREM is pleased to announce the availability of a new passive sampler, the Waterloo Membrane Sampler™ (WMS™) for monitoring VOC vapor concentrations. Originally developed at the University of Waterloo, this sampler has undergone three years of applied research and is now available for commercial use.

KB-1®

The design incorporates a polydimethylsiloxane (PDMS) membrane across the face of a vial filled with a sorbent medium. VOC vapors partition into and permeate through the membrane. The sorbent then traps the vapors, and the mass of each compound is determined by GC/ MS. The uptake rate has been experimentally measured for many common VOCs and can easily be calculated for other compounds because it is directly proportional to the retention index, a property that is readily available in the scientific literature. Thus, you can use the WMS™ sampler to measure time-weighted average concentrations for virtually any VOC.

Advantages compared to conventional air sampling methods

  • Lower cost
  • Simpler sampling protocols
  • Lower reporting limits without a premium price
  • Longer time-integrated samples
  • Very small size (discrete to deploy, and easy to ship)

Benefits compared to other quantitative passive air samplers

  • Predictable uptake rates for less common compounds
  • Ability to measure Total Petroleum Hydrocarbons/Gasoline Range Organics
  • Minimal effect of moisture (good for subsurface monitoring)
  • Insensitive to wind velocity (good for outdoor and vent-pipe monitoring)
  • Ability to modify uptake rate to avoid starvation effect
  • Small diameter (easy to put in vent-pipes or sub-slab probes)
  • Competitive pricing

The WMS™ sampler is available through SiREM and analytical services are provided by Air Toxics Ltd. (Folsom, CA), a specialty air laboratory.

The Waterloo Membrane Sampler for Indoor Air, Outdoor Air, Vent-pipes and Personal Air Monitoring

The Low-Uptake WMS Sampler for Quantitative Passive Soil Vapor Concentration Measurement