Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Spatial and Temporal Gradients in Aquifer Oxidation-Reduction Conditions.
Author Barcelona, M. J. ; Holm, T. R. ; Schock, M. R. ; George, G. K. ;
CORP Author Illinois Dept. of Energy and Natural Resources, Springfield. ;Illinois Univ. at Urbana-Champaign.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/082;
Stock Number PB90-103656
Additional Subjects Aquifers ; Oxidation reduction reactions ; Electrode potentials ; Graphs(Charts) ; Platinum ; Dissolved gases ; Ground water ; Oxygen ; Hydrogen peroxide ; Quantitative analysis ; Measurement ; Tables(Data) ; Reprints ; Redox potential
Library Call Number Additional Info Location Last
NTIS  PB90-103656 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/10/1990
Collation 16p
The study was undertaken to identify principal oxidizing and reducing chemical species in groundwater with the goal of determining the utility of platinum electrode (Eh) measurements to characterize subsurface redox conditions. Serial measurements of Eh and groundwater analyses were conducted in oxic and suboxic environments over more than a 2-year period for major ionic, oxidized, and reduced species. Vertical gradients in measured Eh values in the oxic groundwater environments can exceed -40 mV/m depth. In the poorly poised oxic groundwaters, the Eh measurements correlated reasonably well with calculated values based on analytical determinations of 02 and H202 which was detected persistently in the 10 sup -8 to 10 sup -9 M range. The equilibrium calculated Eh values from redox couples did not correlate well with measured Eh values over the 2-year study period. In the suboxic range, the average calculated values based on the Fe3+/Fe2+ coupled correlated well with averaged measured values. The results support the need to determine redox pairs in groundwater as a supplement to either calculated 'equilibrium' Eh values or Pt electrode Eh measurements.