Sampling for Purgeable Organic Compounds Using Positive-Displacement Piston and Centrifugal Submersible Pumps: A Comparative Study |
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| Authors: | LeRoy L. Knobel Larry J. Mann |
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| Affiliation: | LeRoy L. Knobel (U.S. Geological Survey, INEL, MS 4148, P.O. Box 2230, Idaho Falls, ID 83403) is a hydrologist with the U.S. Geological Survey in Idaho Falls, Idaho. He received a B.S. in geology from the University of Washington and an M.S. in engineering geology from The George Washington University.;Larry J. Mann (U.S. Geological Survey, INEL, MS 4148, P.O. Box 2230, Idaho Falls, ID 83403) is the technical program manager for the U.S. Geological Survey Project Office at the Idaho National Engineering Laboratory near Idaho Falls, Idaho. He has a B.S. in mathematics from Northern Arizona University (1970). During his 28 years with the USGS, he has conducted and supervised ground water investigations in Arizona, California, and Idaho. His primary interests are ground water hydraulics and contaminant migration. |
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| Abstract: | Positive-displacement piston pumps that minimize sample agitation have no apparent advantage over centrifugal submersible pumps when used to collect ground water samples for analysis of low concentrations of purge-able organic compounds. Analytical uncertainties inherent in laboratory environments appear to influence analytical results of low-concentration purgeable organic compound samples more than either pump type or sampling team. Centrifugal submersible pumps are at least equally efficient as positive-displacement piston pumps in the recovery of carbon tetrachloride, 1,1,1-trichloroethane, trichloroethylene, and chloroform after sampling and analytical influences are made constant. |
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