Solinst Canada Ltd. has released its Model 425-D Deep Sampling Discrete Internal Sampler, designed for sampling groundwater or open water bodies from submerged depths as much as 4,000 feet (1,200 meters).

In a release, the company says discrete interval sampling is “ideal for obtaining truly representative water samples and for obtaining samples of product (LNAPL and DNAPL). It is ideal for groundwater sampling from below an oil/product layer on the surface of the water.”

The method can profile open bodies of water, open boreholes and screened wells, and collect samples from distinct levels or points of inflow. Mixing of water from different levels is minimized.

“No-purge” samplers like the Model 425-D Discrete Interval Sampler, Solinst says, have gained acceptance by many regulatory agencies worldwide for obtaining high quality groundwater samples.

The Model 425-D is a stainless steel sampler with LDPE tubing mounted on a convenient reel, which features a pressure attachment for a high-pressure hand pump, and a pressure/vent switch regulate pressure on the sampler.

Operators connect weights to the top of the sampler before lowering, to overcome buoyancy. At depth, the sampler is pressurized. The pressure acts on the top of a piston inside the sampler, overcoming the hydrostatic pressure acting on the bottom of the piston to allow sample water to enter. After the sample is collected, the pressure is released, allowing the piston to reseal at the bottom of the sampler. The sealed sampler is then retrieved to surface, maintaining chemical stability of the sample.

Solinst also offers the standard Model 425 Discrete Interval Sampler in 1", 1.66" and 2" diameters. It is designed for sampling from submerged depths as much as 300 feet (90 meters).

For more information about the new Model 425-D Deep Sampling Discrete Interval Sampler, visit the Solinst website.

Solinst Canada Ltd. has served clients in the groundwater and surface monitoring sectors for more than 35 years. The company offers a range of loggers, peristaltic pumps, samplers and other equipment for hydrogeologists, hydrologists and other water professionals. For more information, visit