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
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ACID NEUTRALIZING CAPACITY
ACID RAIN
ACIDIFICATION
ADSORPTION
AIR-WATER INTERACTIONS
ALUMINIUM
ATMOSPHERIC PRECIPITATIONS
CATIONS
CHARGED PARTICLES
CHEMISTRY
COMPUTERIZED SIMULATION
DEPOSITION
DEVELOPED COUNTRIES
DISSOLUTION
ECOLOGICAL CONCENTRATION
ELEMENTS
ENVIRONMENTAL EFFECTS
FEDERAL REGION I
IONS
LAND POLLUTION
LEACHING
MAINE
METALS
NORTH AMERICA
OXYGEN COMPOUNDS
POLLUTION
RAIN
SEPARATION PROCESSES
SIMULATION
SOIL CHEMISTRY
SOILS
SORPTION
STEADY-STATE CONDITIONS
SULFATES
SULFUR COMPOUNDS
THERMODYNAMICS
USA
WATER CHEMISTRY
WATER POLLUTION
WATERSHEDS