Bailer
A bailer in hydrogeology is a hollow tube used to retrieve groundwater samples from monitoring wells. Groundwater monitoring wells are drilled in areas where there are underground storage tanks or where there is environmental remediation occurring. The wells are typically built out of PVC casing which is slotted to allow groundwater to flow freely through the well. Bailers are tied to a piece of rope (usually made from nylon or polypropylene) or a piece of wire (composed of Teflon or stainless steel) and lowered into the water column. Once lowered, the bailer uses a simple ball check valve to seal at the bottom in order to pull up a sample of the groundwater table. Bailers can be disposable or reusable, and they are made out of polyethylene, PVC, FEP or stainless steel.
貝勒管是水文空心管，用於從地下水監測取樣。地下水監測井位於地下儲水槽或整治環境的地方。通常建井時以PVC套管開槽，讓地下水自由流過。貝勒管上綁一根繩子(通常由尼龍線或聚丙烯線製成或鐵氟龍或不鏽鋼線組成）和垂入水中。一旦入水，貝勒管使用一個簡單的球閥從底部密封，以取樣地下水。貝勒管，可以一次性或可重複使用的，他們可以是PVC，聚氯乙烯，FEP或不鏽鋼。
There are advantages and disadvantages to using bailers for groundwater sampling. Bailers are simple devices to use and are relatively inexpensive. Disposable bailers are usually cleaned to United States Environmental Protection Agency specifications and individually packaged to protect sample integrity. In addition, bailers can be lowered to any depth while pumps have sharp limitations on the depth of the well. The main drawback of using bailers is aeration of the water as the sample is obtained, which could release volatile organic compounds that need to be tested. Also, if there is a high amount of sediment or turbidity, this may interfere with the ball check valve seating correctly.
使用貝勒管採樣地下水各有優劣。貝勒管使用簡單相對便宜。通常美國環保局要求包裝一次性貝勒管，以保證樣品的完整性。此外，貝勒管可以下降到任何深度，而泵井的深度有限制。使用貝勒管的主要缺點是以曝氣的水作為樣本，這可能會釋放揮發性有機物，需要測試。此外，樣品的沉澱或混濁，可能會干擾球閥的正確性。
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