Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Toward a Better Understanding of the Complex Geochemical Processes Governing Subsurface Contaminant Transport.
Author Puls, R. W. ;
CORP Author Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher Jul 91
Year Published 1991
Report Number EPA/600/M-91/013;
Stock Number PB91-216499
Additional Subjects Environmental transport ; Geochemistry ; Path of pollutants ; Subsurface investigations ; Mathematical models ; Physical properties ; Chemical properties ; Biological properties ; Kinetics ; Adsorption ; Comparison ; Field tests ; Desorption ; Ion exchanging ; Waste disposal ; Water pollution ; Land pollution ; Ground water ; Path of pollutants ;
Library Call Number Additional Info Location Last
NTIS  PB91-216499 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 11/26/1991
Collation 17p
Identification and understanding of the chemical, physical, and biological processes controlling subsurface contaminant migration is essential for making accurate predictions on the fate and transport of these constituents. Remediation assessment requires these predictions where pollution from municipal and industrial activities has occurred, and for the responsible siting of waste isolation and storage facilities. Geochemical processes include ion-exchange, precipitation, organic partitioning, chemisorption, aqueous complexation, and colloidal stability and transport. Current approaches to quantify the effect of these processes on transport in a ground water system primarily involve laboratory techniques. These include the use of closed static systems (batch experiments) and dynamic systems (column experiments) where a larger segment of the aquifer is investigated by analyzing the breakthrough profiles of reactive and non-reactive species. The latter approach may be more representative of in situ conditions than the former, however, when compared to large-scale field experiments both are still constrained by: differences in scale, alteration of media during sample collection and use, and spatial variability. More field reactivity studies are needed to complement established laboratory approaches for the determination of retardation factors, scaling factors for laboratory versus field data, corroboration or confirmation of batch and column results, and for validation of sampling techniques.