Solinst 425 Discrete Interval Sampler

Discrete interval sampling is ideal for obtaining truly representative water samples from below floating product layers (LNAPL) and for obtaining samples of product itself (LNAPL and DNAPL). It is also used to profile open bodies of water, open boreholes and screened wells, and to collect samples from distinct levels or points of inflow.

There is negligible disturbance as can be caused by pumping and purging. Mixing of water from different levels in the well is minimized. Purging and disposal of purged water can be avoided. Sampling directly from a specific depth results in the collection of water which is most representative of the groundwater outside of the well at that depth.

Environmental Equipment & Supply also sells the 425 Discrete Interval Sampler

The Solinst Model 425 is a stainless steel sampler, with LDPE tubing mounted on the convenient Solinst reel. The reel has a pressure attachment for the high pressure hand pump, and a pressure/vent switch to apply and release the pressure on the sampler. A sample release device is also included.

The sampler is pressurized using a high pressure hand pump before being lowered into the well. This prevents water flowing through the sampler on the way down the well. Once the desired depth is reached, the pressure is released and hydrostatic pressure allows the sampler and tubing to fill with water directly from the sampling zone.

When the sampler is filled, it is re-pressurized and raised to the surface. The sample is decanted using the sample release device provided, which regulates flow and minimizes degassing of the sample.

The sampler is ideal for groundwater sampling from below an oil/product layer on the surface of the water, as it allows a sample to be obtained which is untouched by the oil.

The sampler is easily disassembled for decontamination, without the need for tools.

Applications

• Obtaining a representative groundwater sample from below oil/product layers
• Discrete interval sampling in lakes, rivers and wells
• Chemical profiling of wells
• Sampling at points of inflow to well
• LNAPL and DNAPL sampling