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Instrument Database:
Rickly Hydrological Company - In-Situ Pore Water Sampler
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| Year of introduction |
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| Status |
available |
| Company |
Rickly Hydrological Company
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| Categories |
Sampling: Soil/Sediment
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The Modified Hesslein In-situ Pore Water Sampler, also called a "peeper" or dialyzer is based on the principle that given enough time, a contained quantity of water in the sampler will diffuse and equilibrate through dialysis membrane, or other materials such as porous Teflon, with the surrounding water and its dissolved solutes. The in-situ equilibrator can either be removed to the surface or the pore water can be collected through attached tubing while the device remains in the sediments.
This sampler is made of two sheets of acrylic plastic (a 0.3 cm thick cover sandwiched with a 1.3 cm thick body) that are held together by screws. Horizontal, elongated sampling compartments are machined 1 cm apart, through the 0.3 cm cover and into the acrylic body. Different types of dialysis membranes are used with these samplers. The membrane is usually pierced with a syringe needle when sampling pore water. Options are 0.2 µm pore size polycarbonate membranes, biologically inert PVC membranes with 0.45 µm pore size and 3 µm Teflon®. A nonporous 75 µm (3 mil Teflon) membrane would allow for diffusion of gases but not ionic chemical species into the sampling compartments.
603-135 Modified Hesslein Sampler 3 lbs.
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