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Rates of Aluminum Dissolution in Acid Sandy Soils Observed in Column Experiments
Author(s) -
Grinsven Hans J.M.,
Riemsdijk Willem H.,
Otjes René,
Breemen Nico
Publication year - 1992
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1992.00472425002100030023x
Subject(s) - dissolution , soil water , leaching (pedology) , weathering , environmental chemistry , extrapolation , aluminium , solubility , chemistry , deposition (geology) , soil acidification , mineralogy , lessivage , soil science , soil ph , environmental science , geology , sediment , mathematical analysis , paleontology , mathematics , organic chemistry , geomorphology
Soil weathering rates were estimated in small, packed soil columns in a controlled chemical environment. Cumulative leaching was described with a simple three‐parameter model, easing interpolation and extrapolation of experimental data. Dissolution of Al was the main buffering process in samples from two acid forest soils, viz. a Dystrochrept and Udipsamment. Aluminum‐leaching was associated with the presence of “free” Al‐oxides, which consist mainly of hydrated oxides of Al. The importance of dissolution of Al‐oxides was also indicated by the effect of temperature on the solubility and dissolution rate of Al. Dissolution rates of Al decreased exponentially with Al depletion from the soil sample (mol/kg) and on average increased with (H + ) 0.7 . Depletion of reactive Al‐oxides in forest soils as a result of acid atmospheric deposition may be a future environmental problem.