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1.3-inch diameter pre-filled PDB
1.3-inch diameter pre-filled PDB

EON Small Diameter Passive Diffusion Sampler- Pre-filled

Small Diameter Passive Diffusion Bag Samplers (PDBs) are used in place of purging and low-flow sampling methods in groundwater monitoring wells less than 2-inches diameter to obtain representative, discrete interval samples of Volatile Organic Compounds under natural groundwater flow conditions. Because these samplers are smaller in diameter than our Equilibrator for 2-inch wells, they are longer in length to obtain sufficient sample volume for analysis.

The PDBs are installed in the saturated screen zone where natural groundwater flow refreshes the water in contact with the samplers. VOC molecules enter and exit the sampler's semi-permeable membrane based on the concentration gradient between the well water and the sampler, maintaining a dynamic concentration equilibrium. After sufficient deployment time the PDBs are removed and the contents emptied into VOA bottles using a "juice box straw" emptying device.

EON's Small Diameter PDBs are supplied pre-filled with de-ionized water, ready for installation and are designed to be extremely easy to install and rugged to survive unexpected field events.

Click Here for information about EON's Suspension Tether Preparation Servies.
Click for our Well Data Form EON will take your data and and provide an itemized quotation for customized Suspension Tethers for each of your wells.

Select from below based on sampler diameter & volume requirements. Order spare samplers for unexpected needs.

 Item # Description/Size Availability Qty Breaks Price Quantity
GSD126_
Passive Diffusion Sampler (PDB); .75 X 18in 80ml (no mesh) Prefilled with ASTM Type 1 DI water. Discharge Straws (GSD290) included-packaged separately
In Stock 1 $20.50
GSD151_
Passive Diffusion Sampler (PDB); .75 X 42in 200 ml (no mesh) Prefilled with ASTM Type 1 DI water. Discharge Straws (GSD290) included-packaged separately
In Stock 1 $20.50
GSD152_
Passive Diffusion Sampler (PDB); .75 X 48in 225 ml (no mesh) Prefilled with ASTM Type 1 DI water. Discharge Straws (GSD290) included-packaged separately
In Stock 1 $25.40
GSD163_
Passive Diffusion Sampler (PDB); 1.3in X 18in 150+ ml Prefilled with ASTM Type I DI water & secured in Mesh. Discharge Straws (GSD290) are included but packaged separately
In Stock 1 $21.60
GSD165_
Passive Diffusion Sampler (PDB); 1.3in X 24-in 250+ ml Prefilled with ASTM Type I DI water & secured in Mesh. Discharge Straws (GSD290) are included but packaged separately
In Stock 1 $24.30
GSD170_
Passive Diffusion Sampler (PDB); 1.3in X 36in 375 ml Prefilled with ASTM Type I DI water & secured in Mesh. Discharge Straws (GSD290) are included but packaged separately
In Stock 1 $27.80
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Custom Tether Manufacturing Service
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Service: PDB Blank ASTM I-100m
Price: $4.00
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PDB Discharge Straw, 4inlength
Price: $0.15
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Locking Well Cap, .75in & ring
Price: $12.30
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Locking Well Cap, T-Cap1.25inR
Price: $9.80
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Locking Well Cap, 1.50  w/ring
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Rope, Poly Braid 1/8inx 1000ft
Price: $19.95
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Rope, Poly Braid 3/16inx1000ft
Price: $19.75
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Snap Connector, Plastic
Price: $1.50
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Cable tie, 4in black nylon
Price: $0.05
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Weight-SST 5/8in Diam 6 oz
Price: $20.00
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Weight-SST 1in Dia x3inLx 11oz
Price: $17.50
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To install Small Diameter Passive Diffusion Bag Samplers (PDBs) the following basic, re-usable, installation materials are recommended;

  • Suspension Tether to which the samplers are attached and suspended in the well,
  • Re-usable Stainless Steel weight to pull the tether assembly into place in the well,
  • A well cap from which to hang the suspension tether,
  • Connectors located on the tether at the location where the sampler is to be deployed and to which the samplers are connected using zip ties.
  • A small reel is helpful for raising or lower the assembly into the well without tangling.

TECHNICAL DOCUMENTS

Passive Diffusion Sampler

Case Studies & Technical Papers

  • Bunnell-Lammons Engineering Study (1998) - Report produced by Andrew Alexander and Thomas Lammons titled "Field Trial of a New Commercially Available Diffusive Ground-Water Sampler". (Equilibrator introduced in study)
  • McClellan Air Force Base (2001) - A recent study that compares cost, ease of use, and analytical results of samples collected by diffusion sampling and low-flow methods. (Equilibrator shown effective)
  • SGS/EPA Guidance Document (2001) - Federal and State Agencies publish a Guidance Document for the use of Passive Diffusion Sampling.
  • ITRC Final Report (2002) - Inter-State Technical Regulatory Council publishes "Recommendations on the Use of Polyethylene Diffusion Bag Samplers for Long Term Monitoring of Volatile Organic Compounds in Groundwater".
  • ITRC Tech-Reg Document (2004) - Inter-State Technical Regulatory Council publishes "Technical and Regulatory Guidance for Using Polyethylene Diffusion Bag Samplers to Monitor Volatile Organic Compounds in Groundwater." This is an aid to regulators and users to determine the applications and use of PDBs.
  • PowerPoint Presentation - A PowerPoint Presentation with basic information in graphical format describing the technical basis, applications, configuration and installation of PDBs in graphical format.

USEPA Region 4 No-Purge Sampler Use Criteria

  • SESDPROC-301-R2 10-28-11.pdf - U.S Environmental Protection Agency Science & Ecosystem Support Division Athens, Georgia Operating Procedure for Groundwater Sampling includes reference to the conditions to consider for acceptable for use of passive samplers.