Acidification and recovery of a Spodosol BS horizon from acidic deposition
A laboratory study was conducted to examine acidification and recovery of a Spodosol Bs horizon from acidic deposition in the Bear Brook Watershed (BBW) in central Maine. A mechanical vacuum extractor was used to draw solutions through a soil column at three treatments containing 40, 100, or 160 micromol/L SO4(2-). Following 44 d of leaching, all treatments were decreased to the 40 micromol/L SO4(2-) level to examine recovery from acidification. Acidic additions were initially neutralized by release of basic cations and sulfate adsorption. Following attainment of steady state conditions for basic cations and SO4(2-) with respect to the soil adsorption complex, Al dissolution was the primary neutralization mechanism. Aqueous Al activities appeared to be regulated by equilibrium with an Al(OH)3 mineral phase. Following decreases in acid loadings, recovery was rapid resulting in retention of basic cations, reversible release of SO4(2-) and a marked reduction in the concentrations of soluble Al.
- Research Organization:
- Syracuse Univ., NY (United States). Dept. of Civil and Enviromental Engineering
- OSTI ID:
- 6145546
- Report Number(s):
- PB-91-240473/XAB
- Resource Relation:
- Other Information: Pub. in Environmental Science and Technology, v24 n4 p531-537 1990. Sponsored by Corvallis Environmental Research Lab., OR
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACID RAIN
DEPOSITION
ALUMINIUM
ECOLOGICAL CONCENTRATION
MAINE
POLLUTION
SOILS
ACIDIFICATION
SULFATES
ADSORPTION
WATERSHEDS
ACID NEUTRALIZING CAPACITY
AIR-WATER INTERACTIONS
CATIONS
COMPUTERIZED SIMULATION
ENVIRONMENTAL EFFECTS
LAND POLLUTION
LEACHING
SOIL CHEMISTRY
STEADY-STATE CONDITIONS
THERMODYNAMICS
WATER POLLUTION
ATMOSPHERIC PRECIPITATIONS
CHARGED PARTICLES
CHEMISTRY
DEVELOPED COUNTRIES
DISSOLUTION
ELEMENTS
FEDERAL REGION I
IONS
METALS
NORTH AMERICA
OXYGEN COMPOUNDS
RAIN
SEPARATION PROCESSES
SIMULATION
SORPTION
SULFUR COMPOUNDS
USA
WATER CHEMISTRY
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
540220 - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)