| Main Title |
Mineral Weathering Rates from Small-Plot Experiments, WMP Site, Bear Brooks, Maine, U.S.A. |
| Author |
Drever, J. I. ;
Swoboda-Colberg, N. G. ;
|
| CORP Author |
Wyoming Univ., Laramie. Dept. of Geology and Geophysics.;Corvallis Environmental Research Lab., OR. |
| Publisher |
1993 |
| Year Published |
1993 |
| Report Number |
EPA/600/A-93/246; |
| Stock Number |
PB94-107992 |
| Additional Subjects |
Minerals ;
Weathering ;
Silicates ;
Soil analysis ;
Dissolving ;
Acidification ;
pH ;
Kinetics ;
Air pollution ;
Field tests ;
Cation exchanging ;
Experimental design ;
Deposition ;
Water pollution ;
Maine ;
Reprints ;
Bear Brooks(Maine) ;
Bear Brooks Watershed Manipulation Project
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB94-107992 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
5p |
| Abstract |
The pH-dependence of silicate mineral weathering rates was measured in small-plot experiments at the Bear Brooks Watershed Manipulation Project site in Maine, USA. Six 2 sq m plots were acidified with solutions of HCl in deionized water at pH values of 2, 2.5, and 3. Acid application was at the rate of 3 cm/week for approximately 26 weeks per year for 2 years. Soil solutions were collected by tension lysimeters at 25 and 50 cm depths. The composition of the soil solutions, together with the grain-size distribution and mineralogy of the soil, were used to calculate mineral weathering rates. In the lab experiments, the dependence or base cation release rates on pH varied from cation to cation, reflecting the different behavior of different minerals. Dissolution rates observed in the field, normalized on the basis of geometrical mineral surface area, were smaller than laboratory rates by a factor of about 200. Laboratory dissolution experiments can be used to predict the pH-dependence of mineral weathering in the field, but not absolute rates. |
| Supplementary Notes |
Pub. in Experimental Manipulations of Biota and Biogeochemical Cycling in Ecosystems, p214-216 1993. Sponsored by Corvallis Environmental Research Lab., OR. |
| NTIS Title Notes |
Book chapter. |
| Title Annotations |
Reprint: Mineral Weathering Rates from Small-Plot Experiments, WMP Site, Bear Brooks, Maine, U.S.A. |
| Category Codes |
48F; 48E; 99F; 68A; 68D |
| NTIS Prices |
PC A01/MF A01 |
| Primary Description |
600/02 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
335126679 |
| Origin |
NTIS |
| Type |
CAT |
