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Relationships between Aqueous Aluminum and Acidic Deposition in
Forested Watersheds of North America and Northern Europe
Cronan, CS | Schofield, CL
Environmental Science and Technology ESTHAG Vol. 24, No. 7, p
1100-1105, July 1990. 5 fig, 2 tab, 50 ref. EPRI Contract
RP2365-01.
There are important interregional differences in the
concentrations of aqueous labile aluminum in soil waters and
surface waters of forested watersheds in eastern North America and
northern Europe. These variations in labile aluminum are functions
of several interacting factors, including: soil base saturation,
solution pH, anion chemistry, pH-dependent solubility, and
adsorption relationships and soil hydrology. The highest
concentrations of labile aluminum are found in watersheds
characterized by soils with less than 10-15% base saturation and
elevated concentrations of strong acid anions. For such sites,
there is a strong positive relationship between acidic deposition,
as a source of mobile anions, and aluminum mobilization. Future
increases or decreases in mobile strong acid anions at these types
of watersheds are likely to produce corresponding changes in both
the concentrations of labile aluminum, and the potential for
aluminum toxicity to organisms. (Author 's abstract)
 Descriptors: Acid rain | Aluminum | Leaching | Path of pollutants | Surface water | Acid soils | Acidity | Anions | Forest watersheds | Geochemistry | Hydrogen ion concentration | Lakes
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