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RECORD NUMBER: 201 OF 382

OLS Field Name OLS Field Data
Main Title Kinetics of Chemical Weathering: A Comparison of Laboratory and Field Weathering Rates (Chapter 17).
Author Schnoor, J. L. ;
CORP Author Iowa Univ., Iowa City. Dept. of Civil and Environmental Engineering.;Corvallis Environmental Research Lab., OR.
Publisher 1990
Year Published 1990
Report Number EPA/600/A-92/018;
Stock Number PB92-143858
Additional Subjects Weathering ; Geochemistry ; Hydrogeology ; Reaction kinetics ; Chemical reactions ; Experimental design ; Field tests ; Minerals ; Hydrologic cycle ; Comparison ; Dissolution ; Sea ; Study estimates ; Sediments ; Soil formation ; Sedimentary rocks ; Environmental transport ; Reprints ;
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB92-143858 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 18p
Abstract
'Chemical Weathering' can be defined as the dissolution of minerals by the action of water and its solutes. It is an important feature of the global hydrogeochemical cycle of elements, whereby rocks and primary minerals become transformed to solutes and soils and, eventually, to sediments and sedimentary rocks. In the cycle, water occupies a central position serving as both a reactant and a transporting agent of suspended and dissolved material. The sea is the ultimate receptacle of weathered material, and the atmosphere provides a reservoir of weak acids (CO2) and oxidants. A comparison of laboratory weathering rates and estimates from the field indicated that laboratory rates were one to two orders of magnitude greater than field estimates of chemical weathering. The discrepancy is likely due to the difficulty of estimating a suitable wetted surface area of weatherable (reacting) minerals in the field, and the possibility of hydrologic control, due to micropore flow through soils.