Groundwater Sampling Devices
7
Solinst's model number 425 (Fig. 3) is a stainless steel sampler with Viton
O-rings. Airline tubing that runs from the surface to the sampler is typically
LDPE (although Teflon and Teflon-lined polyethylene tubing are also available)
and is mounted on a reel. The system is pressurized with a high-pressure hand
pump that activates a pressure/vent switch. Once the desired depth is reached, the
pressure is released and hydrostatic pressure allows the sampler and tubing to fill
with water from the sample zone. The sampler is then repressurized and brought
to the surface and the sample is decanted using a sample release device that,
according to the manufacturer, is designed to prevent degassing of the sample.
The price for this sampler is ~0. We have not found any published studies
that evaluated this device.
a. Solinst model number 425.
Figure 3. Discrete Interval Sampler.
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