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.

Research & Development, Scientific Research and Development Services, Research institutes, Bacteria, Microorganisms, Protozoa, Protozoans

---

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.

Water, Underground, Groundwater, Contamination, Absorption

---

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.

Analysis, Environmental aspects, Seepage, Seepage (Hydrology), Sorbents

Similar abstracts:

• Abstracts: Multiresidue method for determination of post-emergence herbicides in water by HPLC/ESI/MS in positive lonization mode
• Abstracts: Two G protein oncogenes in human endocrine tumors. Pieces of the true grail: a G protein finds its target. Trimeric G proteins: surprise witness tells a tale
• Abstracts: Sorption of chlorophenols to wood pulp. Reactions of dibenzo-p-dioxin and dibenzofuran with electrophilic reagents
• Abstracts: Determination of pesticides and polychlorinated biphenyls in water: a low-solvent method. Fate and transport of Detroit River derived pollutants throughout Lake Erie
• Abstracts: Surface-catalyzed autoxidation of sulfur(IV) in aqueous silica and copper(II) oxide suspensions. Mechanism and kinetics of autoxidation of calcium sulfite slurries

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.