Sulfate sorption by acid forest soils. 1. Sulfate adsorption isotherms and comparison of different adsorption equations in describing sulfate adsorption
The authors studied sulfate adsorption by four acid forests soils to determine the adsorption capacities of these soils and to compare different adsorption equations in describing sulfate adsorption. The adsorption capacity of the iron-podzols (P/sub 1/ and P/sub 5/) was nearly double that of the semipodzol (P/sub 4/) and the brown earth (P/sub 6/), but none of the soils showed a tendency to reach maximum within the SO/sub 4//sup -2/ concentration range (10 to 800 ..mu..g S/ml) tested. The iron-podzols also showed a higher affinity for SO/sub 4//sup -2/ adsorption than the semipodzol and brown earth. Not only the adsorption capacity but also the affinity for sulfate adsorption was reduced when the SO/sub 4//sup -2/ adsorption data were corrected for isotopically exchangeable SO/sub 4//sup -2/. Of the five adsorption equations - the Freundlich, extended Freundlich, Langmuir, Sibbesen, and Temkin - compared, the Freundlich equation was found to be the best in describing SO/sub 4//sup -2/ adsorption. The Langmuir equation provided the alternative, if the already adsorbed SO/sub 4//sup -2/ was not taken into account. The adsorption coefficients of these two equations were well correlated. For example, A of the two equations was highly correlated. The isotopically exchangeable SO/sub 4//sup -2/ in these soils was found to be highly correlated with the already present SO/sub 4//sup -2/ (phosphate-extractable). 23 references, 6 figures, 3 tables.
- Research Organization:
- Agricultural Univ. of Norway, As-NLH
- OSTI ID:
- 5960837
- Journal Information:
- Soil Sci.; (United States), Vol. 138:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SOILS
SORPTIVE PROPERTIES
SULFATES
ADSORPTION
ADSORPTION ISOTHERMS
AFFINITY
COMPARATIVE EVALUATIONS
EQUATIONS
EXPERIMENTAL DATA
FORESTS
PH VALUE
DATA
INFORMATION
ISOTHERM
NUMERICAL DATA
OXYGEN COMPOUNDS
SORPTION
SULFUR COMPOUNDS
SURFACE PROPERTIES
510200* - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)