LNAPL and DNAPL Sampling
The Solinst Model 122 Interface Meter quickly and easily detects water as well as floating or sinking product layers (LNAPL or DNAPL).
Infra-red refraction is used to detect liquids and conductivity to distinguish water. A steady light and tone indicates product. Water is indicated by intermittent signals.
Once an LNAPL or DNAPL layer is detected, a sample can be taken using the Model 425 Discrete Interval Sampler at the depth indicated on the Interface Meter flat tape (marked every 1/100 ft. or mm).
Discrete interval samplers are excellent for VOC sampling since there is no mixing with water from different levels in the well. The sample has minimal contact with air, and does not travel through a long length of tubing, risking loss of volatile organics.
A cable connector is included at the top of the sampler for easy connection to a suspension cable. The Solinst Model 103 Tag Line Solinst Model 103 Tag Lineis ideal. It uses permanently laser marked polyethylene coated stainless steel, or PVDF flat tape, mounted on a reel. It comes with a clip for easy attachment/disattachment.
Samplers are constructed of stainless steel with o-rings, PTFE and polypropylene check balls.
Tubing most commonly used is low density polyethylene (LDPE), however, PTFE or PTFE-lined polyethylene tubing is also available.
The Solinst Discrete Interval Sampler can sample to depths of 500 ft. (150 m) below water level, regardless of total depth from surface.