Diffusion Sampler


The Diffusion Sampler comprises the sampler, a stainless steel hanger and a stainless steel weight. The semi-permeable sample chamber filled with deionized water (purchased separately).


  • Passive VOC sampling at discrete intervals in groundwater

It is lowered into the well screen and left in place. VOCs in the groundwater diffuse into the sampler until the concentration gradient equilibrates between the water in the formation and the sampler. The sampler is retrieved and contents easily emptied into VOA vials for laboratory analysis. These samplers are currently in use at U.S. D.O.D. sites, EPA-monitored sites, major industrial sites and small petroleum monitoring sites across the United States. Diffusion sampling technology is licensed by the U.S. Government yielding results that correlate with bailing.


diffusion sampler
TR-10200Diffusion Sampler - 350 ml (disposable)
TR-10096Stainless Steel Hanger (reusable)
TR-10095Stainless Steel Weight, Standard (reusable)
TR-10098Stainless Steel Weight, X-Heavy (reusable)
TR-10097Optional Fill Device (reusable)

Custom-made tethers.

diffusion sampler custom-made tethers

Custom-made well caps with hangers.

diffusion sampler well caps with hangers

Equipment needed to deploy

  • Sampler, pre-filled or empty
  • Weight (standard, X-Heavy or in-line)
  • Fill Kit
  • Tether or rope
  • Well caps with 1" Stainless Steel rings
  • Snap Clips
  • Cable Ties

For more information

Comprehensive info on diffusion samplers from the ITRC Diffusion Sampler Information Center.