||Carbonate Equilibria and Groundwater Sample Collection: Implications for Estimated Average Subsurface Properties in Continental North America.
Loux, N. T. ;
Allison, J. D. ;
Chafin, C. R. ;
Hassan, S. M. ;
||Environmental Research Lab., Athens, GA. ;Lake Michigan Federation, Chicago, IL. ;Technology Applications, Inc., Athens, GA. ;Mansoura Univ. (Egypt). Faculty of Pharmacy.
Carbon dioxide ;
Ground water ;
Environmental transport ;
Foreign technology ;
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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.