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Point Source Bailer
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 opposed to that which can be caused by pumping and purging. Mixing of the sample with water from different levels in the well is also minimised. 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.
Solnist Model 429 Point Source Bailer
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 retrieval. 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 direct push devices.
METHOD OF OPERATION
The bailer is lowered slowly 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.
The Point Source Bailer is constructed of stainless steel with Teflon ball valves and Viton o-rings. The sampler comes complete with a stainless steel sample release device to avoid loss of volatiles during transfer to the sample vial. The standard support line is stainless steel. Teflon coated steel support line is also available. If desired, a storage and winding reel is available on which to store the cable.
Point Source Bailers come in 2ft. (610 mm) length as standard or an optional 4 ft. (1220 mm) length
Viton & Teflon are registered trademarks of Dupont Corporation.