Record Display for the EPA National Library Catalog

RECORD NUMBER: 173 OF 1664

OLS Field Name OLS Field Data
Main Title Carbonate Equilibria and Groundwater Sample Collection: Implications for Estimated Average Subsurface Properties in Continental North America.
Author Loux, N. T. ; Allison, J. D. ; Chafin, C. R. ; Hassan, S. M. ;
CORP Author Environmental Research Lab., Athens, GA. ;Lake Michigan Federation, Chicago, IL. ;Technology Applications, Inc., Athens, GA. ;Mansoura Univ. (Egypt). Faculty of Pharmacy.
Publisher c1991
Year Published 1991
Report Number EPA/600/J-91/223;
Stock Number PB92-101690
Additional Subjects Carbon dioxide ; Geochemistry ; Ground water ; Aquifers ; Metals ; pH ; Environmental transport ; Instability ; Concentration(Composition) ; Degassing ; Bicarbonates ; Sampling ; Reprints ; Foreign technology ; Metal speciation
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB92-101690 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 02/24/1992
Collation 15p
Abstract
The geochemistry of carbon dioxide in oxygenated groundwater may have a profound impact on analytical results obtained from efforts to measure in situ groundwater pH conditions and on the speciation, partitioning behavior and potential transport of inorganic contaminants in aquifers. Based on the observation that an estimate of the mean, national-average groundwater pH changes from 6.65 to 6.83, depending on the delay time before analysis, a mechanism of pH alteration resulting from CO2 degassing is examined to provide an estimate of the ratio between groundwater and atmospheric partial pressures of CO2 (PCO2,GW/PCO2atm=1.5). The instability in groundwater sample pH after exposure to the atmosphere may be useful for characterizing the source environments.