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RECORD NUMBER: 242 OF 382

OLS Field Name OLS Field Data
Main Title Mineral Weathering Rates in Acid-Sensitive Catchments: Extrapolation of Laboratory Experiments to the Field.
Author Drever, J. I. ; Swoboda-Colberg, N. ;
CORP Author Wyoming Univ., Laramie.;Corvallis Environmental Research Lab., OR.
Publisher 1992
Year Published 1992
Report Number EPA/600/A-92/040;
Stock Number PB92-153030
Additional Subjects Weathering ; Water pollution control ; Soil chemistry ; Minerals ; Watersheds ; Acidification ; Water chemistry ; Long term effects ; pH ; Experimental design ; Field tests ; Deposition ; Experimental design ;
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB92-153030 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 08/28/1992
Collation 6p
Abstract
The major processes by which acid deposition is neutralized in soils are cation exchange (including aluminum dynamics), sulfate adsorption, and chemical weathering. The long-term response, however, is dominated by chemical weathering, and the authors ability to predict the effect of acid deposition on chemical weathering rates is severely limited. The dissolution rates of size- and density-fractionated minerals from a soil at the Bear Brook site in Maine are similar to those of crushed 'museum' specimens, suggesting that prolonged exposure in the soil does not per se cause a decrease in weathering rate. The surface-area normalized weathering rate in the field plots appears to be a factor of 18 slower than in the lab experiments. The discrepancy might be due to an unrealistic estimate of contact time between minerals and solution, or to the inhibitory effect of high A1 concentrations on feldspar dissolution rates.