||Mineral Dissolution Rates: A Comparison of Laboratory and Field Studies.
Swoboda-Colberg, N. G. ;
Drever, J. I. ;
||Wyoming Univ., Laramie.;Corvallis Environmental Research Lab., OR.
Water pollution ;
Soil surveys ;
Bear Brook ;
Experimental design ;
Field tests ;
Water chemistry ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Dissolution rates of the 75-150 micrometer size fraction of soil from the Bear Brook site in Maine were measured in flow-through reactors and compared to rates measured in small-plot field experiments at the Bear Brook site. The use of small plots and 'untreated' minerals from the same location eliminated many of the uncertainties previously encountered in field-laboratory comparisons. Field dissolution rates, normalized on the basis of geometrical mineral surface area, were smaller than laboratory rates by a factor of about 150. This discrepancy might be due to the fact that the dissolution rate is not proportional to the geometrical surface area over the whole range of grain sizes. Other explanations are imperfect contact between soil minerals and percolating solution, or inhibitory effects of high dissolved aluminum concentrations.