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    Overview

    Point Source Sampling

    Method of Operation

    Specifications

Overview

The Solinst Point Source Bailer has dual ball valves, top and bottom. This prevents a sample collected at a discrete depth from mixing with water from other depths during

The Point Source Bailer is a simple and cost effective device for aquifer profiling. It needs no costly or hard to transport ancillary equipment, making it ideal for point source sampling in hard to access locations. The miniature 0.5" (12.7 mm) diameter model is ideal for use in narrow tubes and drive-point devices.

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Point Source Sampling

Point source sampling can be used to profile an open borehole or screened well, to collect samples from distinct levels or points of inflow. There is negligible disturbance as can be caused by pumping and purging. Mixing of the sample with water from different levels in the well is minimized. Purging and disposal of purged water can be avoided, because sampling directly from a specific depth collects the water that has just flowed into the well at that depth.

Solinst also manufactures the Model 425 Discrete Interval Sampler which is pressurized before lowering into the well to prevent water from entering the sampler until the sampling zone has been reached.

The Model 425T Transportable DIS is similar, but uses special shut-off valves to retain the volatiles in a zero headspace sample, in down-hole condition, during transport to the laboratory.

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Method of Operation

The bailer is lowered to the desired sample depth on a support line. As the bailer is being lowered, both ball valves open, allowing water to flow through the sampler. On reaching the sampling depth, the bailer is raised using the support cable and optional winding reel. The weight of water and upward movement of the bailer keep both ball valves closed. The top ball valve prevents the sample in the bailer from mixing with water at higher levels in the borehole. Once at the surface, the bailer is emptied by opening the top vent, and allowing the water to drain slowly through the sample release device into the sample container. The Point-Source Bailer can then be decontaminated before taking the next sample.

Once at the surface, the bailer is emptied by opening the top vent, and allowing the water to drain slowly through the sample release device into the sample container. The Point-Source Bailer can then be decontaminated before taking the next sample.

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Specifications

The standard support line is stainless steel. Teflon® coated steel support line is also available. If desired, a Solinst storage and winding reel is available on which to store the cable.

Viton® & Teflon® are registered trademarks of Dupont Corporation.

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