||Acidification and Recovery of a Spodosol Bs Horizon from Acidic Deposition.
Dahlgren, R. A.;
McAvoy, D. C.;
Driscoll, C. T.;
||Syracuse Univ., NY. Dept. of Civil and Environmental Engineering.;Corvallis Environmental Research Lab., OR.
Air water interactions;
Acid neutralizing capacity;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||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. (Copyright (c) 1990 American Chemical Society.)
||Pub. in Environmental Science and Technology, v24 n4 p531-537 1990. Sponsored by Corvallis Environmental Research Lab., OR.
|NTIS Title Notes
||Reprint: Acidification and Recovery of a Spodosol Bs Horizon from Acidic Deposition.
||68D; 68A; 48G; 48E; 99F
||PC A02/MF A01