Aluminum solubility in organic soil horizons from northern and southern forested watersheds

Journal Article · · Soil Science Society of America Journal; (United States)

DOI:https://doi.org/10.2136/sssaj1990.03615995005400020012x· OSTI ID:5559226

Walker, W J ^[1]; Cronan, C S ^[2]; Bloom, P R ^[3]

---

1. Univ. of California, Davis (USA)
2. Univ. of Maine, Orono (USA)
3. Univ. of Minnesota, St. Paul (USA)

A study was conducted to determine the influence of organic matter on the solubility of Al in organic soil horizons from different geographic regions. Results showed that the equilibrium solubility of Al was dependent on solution pH and the degree to which the soil organic matter was saturated with Al. Plots of Al solubility showed that, as solution pH decreased, soluble Al increased, and that, for a given pH, soluble increased with increasing surfacebound Al. In addition, Al solubility was always less than that predicted from the solubility of natural gibbsite or kaolinite. Temperature dependence and rate studies suggested that Al solubility was governed by an ion-exchange reaction between H{sup +} and Al and the organic matter. Aluminum solubility was similar in Oi and Oa horizon soils at the same bound aluminum ratio (BAR) and pH. No differences were noted when the soils were compared on a regional basis, suggesting that prediction of aqueous Al concentrations in organic horizons and peaty hydrologic areas could be accomplished.

• OSTI ID: 5559226
• Journal Information: Soil Science Society of America Journal; (United States), Journal Name: Soil Science Society of America Journal; (United States) Vol. 54:2; ISSN SSSJD; ISSN 0361-5995
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
ALUMINIUM
ALUMINIUM COMPOUNDS
ALUMINIUM HYDROXIDES
ALUMINIUM SILICATES
ELEMENTS
ENERGY SOURCES
FORESTS
FOSSIL FUELS
FUELS
GIBBSITE
HUMUS
HYDROGEN COMPOUNDS
HYDROXIDES
ION EXCHANGE
KAOLINITE
MATTER
METALS
MINERALS
ORGANIC MATTER
OXIDE MINERALS
OXYGEN COMPOUNDS
PEAT
PH VALUE
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SOILS
SOLUBILITY
TEMPERATURE DEPENDENCE
WATERSHEDS