Transformations of aluminum in waters draining podzolic forest soils

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5163813

Browne, B A

In this study, I undertook a combined laboratory and field investigation of the chemistry and transformations of soluble aluminum-ligand complexes prevalent in podzolic soils. Three biogeochemically important ligands (silicate, phosphate, and fulvate) were tested in laboratory studies. Silicate and phosphate formed a series of soluble mono- and di-nuclear aluminum complexes exhibiting pH dependent conditional stabilities consistent with mixed hydroxy-Al-ligand species. Equilibrium constants were estimated for a soluble mononuclear aluminum-silicate (AlH{sub 3}SiO{sub 4}{sup 2+}) and a series of hydroxy-aluminum-phosphate complexes. Binding between Al and fulvate was consistent with 1:1:0, 1:1:1 and 1:1:2 Al:fulvate:OH combining ratios, and a pH dependent form of a two-site Scatchard model was developed to model the experimental data. Field studies were conducted in three watersheds overlain by podzolic soils: Hubbard Brook Experimental Forest, New Hampshire; the North Branch of Moose River, New York State: and Jamieson Creek Watershed, British Columbia. Aluminum-organic complexes dominated the chemistry of soluble aluminum in each study watershed. A simple, accurate predictive model of aluminum speciation was developed based on pH titration data of surface water samples.

• Research Organization: Syracuse Univ., NY (USA)
• OSTI ID: 5163813
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ACID RAIN
ACIDIFICATION
ALUMINIUM
ATMOSPHERIC PRECIPITATIONS
BIOGEOCHEMISTRY
BRITISH COLUMBIA
CANADA
CHEMISTRY
COMPLEXES
ELEMENTS
FEDERAL REGION I
FEDERAL REGION II
FORESTS
FULVIC ACIDS
GEOCHEMISTRY
MATHEMATICAL MODELS
METALS
NEW HAMPSHIRE
NEW YORK
NORTH AMERICA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PHOSPHATES
PHOSPHORUS COMPOUNDS
POLLUTION
RAIN
SILICATES
SILICON COMPOUNDS
SOILS
SOLUBILITY
USA
WATER CHEMISTRY
WATER POLLUTION
WATERSHEDS