Physiological considerations in applying laboratory-determined buoyant densities to predictions of bacterial and protozoan transport in groundwater: results of in-situ and laboratory tests
Article Abstract:
The buoyant densities of groundwater bacteria and microflagellates (protozoa) may provide insights into understanding a microorganism's rate of immobilization, retardation, and sedimentation within sandy aquifer sediments. Observations on microorganisms found in sandy aquifers using the density-gradient centrifugation and Stoke's law approximation methods show that sedimentation is important in predicting subsurface transport of less buoyant cultured bacteria, but negligible in predicting those of the more buoyant free living bacteria.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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Laboratory investigations on the role of sediment surface and groundwater chemistry in transport of bacteria through a contaminated sandy aquifer
Article Abstract:
The way in which the sorption of groundwater bacteria through a contaminated sandy aquifer was affected by sediment surface and pH was studied. The study also investigated the way in which sorption was affected by the composition of water, organic matter in water and coatings of oxyhydroxide on grains of sand. The results indicated that the sorption and desorption of bacteria through aquifer sediments were greatly affected by the geochemistry of the groundwater.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1992
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Mobility of natural organic matter in a sandy aquifer
Article Abstract:
The mobility of natural organic matter (NOM) and the transport behavior of its subcomponents are discussed. Eighty thousand liters of brown water taken from a wetland pond was infiltrated into a shallow, sandy, coastal plain aquifer as part of the two-well tracer tests conducted. Significant mobility was exhibited by NOM in an aquifer. This characteristic shows the capacity of NOM for altering the transport of groundwater contaminants.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1993
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