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- W2147060410 abstract "We developed and tested a simple, inexpensive dialysis sampler design for in situ measurement of nitrate and salinity in monitoring wells. The dialysis sampler is made with regenerated cellulose membrane tubing that is placed in an open cage, 18.5 mm in diameter and constructed of commonly available, inexpensive hardware. The design was tested in a monitoring well network installed in shallow, relatively warm (21°C) ground water of a sandy aquifer impacted by animal waste discharge and agricultural fertilizer. Three dialysis samplers were placed near the bottom, center, and below the top of 7 m long well screens in an otherwise open well casing (open multilevel sampling [oMLS]). In laboratory tests we found that 1 to 4 d was sufficient equilibration time to collect a representative sample, yet short enough to ensure the integrity of the membrane samplers, which began to degrade after ∼1 week. Significant, density-stable salinity gradients were detected in ∼25% of samples taken on two sampling dates in 40 wells. Nonuniform, heterogeneous nitrate profiles were much more common (80%). Despite the nonuniformity in the open profile, the average of the three samplers (= composite sample) was generally within 10% of the electrical conductivity and nitrate concentrations obtained by standard purging and well sampling using a pump. At initial hardware costs of approximately $1 per reusable oMLS sampling string and at sampling costs of $1 to $3 per oMLS sampling string for disposable membrane material, dialysis samplers are a good candidate for a low-cost, low-tech sampling device to determine major water quality parameters in small diameter ground water monitoring wells." @default.
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- W2147060410 date "2004-11-01" @default.
- W2147060410 modified "2023-09-27" @default.
- W2147060410 title "Evaluation of a Simple, Inexpensive Dialysis Sampler for Small Diameter Monitoring Wells" @default.
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- W2147060410 doi "https://doi.org/10.1111/j.1745-6592.2004.tb01307.x" @default.
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