Aluminum release rates from allophanic and nonallophanic Andosols
Open Access
- 1 March 1994
- journal article
- research article
- Published by Taylor & Francis in Soil Science and Plant Nutrition
- Vol. 40 (1), 125-136
- https://doi.org/10.1080/00380768.1994.10414285
Abstract
Aluminum release rates were studied for subsoil horizons of allophanic and nonallophanic Andosols and for imogolite gel films. Release rates were determined using a stirred, flow-through reaction vessel with a 10−3 M acetate buffer adjusted to pH 3.3, 3.8, or 4.2. To determine the sources of dissolved AI, soils were pretreated with Kel, Na-pyrophosphate, citrate-bicarbonate-dithionite, and acid oxalate to remove various solid-phase pools of active AI. Rates of Al release for imogolite gel films during the first minute of reaction ranged from 74.8 nmol/gls at pH 4.2 to 113.3 nmol/g/s at pH 3.3. Rates of AI release for nonallophanic Andosols were greater than for allophanic Andosols due to the rapid release of exchangeable Al from nonallophanic Andosols. Aluminum release rates showed fractional order H+ -dependence ranging from 0.23 to 0.54. The primary source of dissolved Al in allophanic Andosols was from AI-humus complexes and allophane/imogolite. In nonallophanic Andosols, exchangeable Al and AI-humus complexes were the primary sources of dissolved AI. Treatment with KCl increased Al release rates for allophanic Andosols, possibly due to precipitation of polymeric-AI on soil surfaces. Iron oxyhydroxide coatings substantially attenuated Al release rates from allophane and imogolite in allophanic Andosols.Keywords
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