| Solute and colloid transport in karst conduits under low- and high-flow conditions. | |
| | |
MedLine Citation:
|
PMID: 18181865 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Solute and colloid transport in karst aquifers under low and high flows was investigated by tracer tests using fluorescent dyes (uranine) and microspheres of the size of pathogenic bacteria (1 microm) and Cryptosporidium cysts (5 microm), which were injected into a cave stream and sampled at a spring 2.5 km away. The two types of microspheres were analyzed using an epifluorescence microscope or a novel fluorescence particle counter, respectively. Uranine breakthrough curves (BTCs) were regular shaped and recovery approached 100%. Microsphere recoveries ranged between 27% and 75%. During low flow, the 1-microm spheres displayed an irregular BTC preceding the uranine peak. Only a very few 5-microm spheres were recovered. During high flow, the 1-microm-sphere BTC was regular and more similar to the uranine curve. BTCs were modeled analytically with CXTFIT using a conventional advection dispersion model (ADM) and a two-region nonequilibrium model (2RNE). The results show that (1) colloids travel at higher velocities than solutes during low flow; (2) colloids and solutes travel at similar velocities during high flow; (3) higher maximum concentrations occur during high flow; and (4) the 2RNE achieves a better fit, while the ADM is more robust, as it requires less parameters. |
| | |
Authors:
|
Nadine Göppert; Nico Goldscheider |
Related Documents
:
|
14621145 - Removal of indicator bacteria from municipal wastewater in an experimental two-stage ve... 8079705 - Red blood cell velocity in nailfold capillaries during hyperbaric oxygenation. 19548025 - Hydrogeochemical indicators of groundwater flow systems in the yangwu river alluvial fa... 16043705 - Mid- to late-holocene el nino-southern oscillation dynamics reflected in the subtropica... 10680675 - Ischemic hepatitis induced by mesenteric volvulus in a patient with chronic obstructive... 15948435 - Blood management in total joint arthroplasty. |
Publication Detail:
|
Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Ground water Volume: 46 ISSN: 0017-467X ISO Abbreviation: Ground Water Publication Date: 2008 Jan-Feb |
Date Detail:
|
Created Date: 2008-01-09 Completed Date: 2008-03-11 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9882886 Medline TA: Ground Water Country: United States |
Other Details:
|
Languages: eng Pagination: 61-8 Citation Subset: IM |
Affiliation:
|
Department of Applied Geology, University of Karlsruhe, Kaiserstrasse 12, D-76128 Karlsruhe, Germany. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Austria Colloids Fluorescein* Fluorescent Dyes* Germany Microspheres* Particle Size Water Movements* Water Pollutants* Water Supply |
| Chemical | |
Reg. No./Substance:
|
0/Colloids; 0/Fluorescent Dyes; 0/Water Pollutants; 2321-07-5/Fluorescein |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Irreversible phosphorus sorption in septic system plumes?
Next Document: Storm-damaged saline-contaminated boreholes as a means of aquifer contamination.