A Discrete Point Sampler for Ground Water Monitoring Wells |
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| Authors: | James R MacPherson Jr James F Pankow |
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| Institution: | James R. MacPherson Jr. is a graduate research associate in the Department of Environmental Science and Engineering at the Oregon Graduate Center (19600 NW Von Neumann Dr., Beaverton, OR 97006-1999). He received his B.S. in biology from the College of William and Mary in 1980, and continued there to receive his M.S. in environmental chemistry in 1982. He then worked for a consulting firm on TSCA, FIFRA, and RCRA projects until 1984. His research interests include vapor phase transport in the unsaturated zone, sampling and analytical method development, and the role of biodegradation in contaminant fate.;James F. Pankow is professor and chairman of the Department of Environmental Science and Engineering at the Oregon Graduate Center (19600 NW Von Neumann Dr., Beaverton, OR 97006-1999). He received his B.A. in chemistry in 1973 from the State University of New York at Binghamton, and his Ph.D. in environmental engineering science from the California Institute of Technology in Pasadena, California, in 1979. His group is involved in the study of the physical and chemical processes affecting the behavior of organic compounds in the environment. This work includes the development and application of appropriate sampling and analysis techniques for the determination of trace organic compounds in ground water. |
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| Abstract: | A discrete point sampler has been developed that overcomes disadvantages inherent in several current small-volume samplers. It is designed to obtain ground water samples after a well has been purged with a pump. It consists of a sample chamber, two ports, and a stopcock for withdrawing sample aliquots. After lowering the sampler into a well, sampling is initiated by pulling on a line that sequentially removes the plugs in the lower and the upper level ports. The sample chamber fills from the bottom port and vents air from the top port. The device is suitable for sampling for volatile organic compounds in ground waters that are not subject to spontaneous bubble degassing. The upper port is sufficiently far above the lower port that none of the water that is sampled is exposed to the vented air. The sample chamber fills in such a way that the water that is taken from the chamber for analysis is not exposed to the headspace in the chamber. |
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