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Artificial Weathering of Oxidized Biotite: II. Rates of Dissolution in 0.1, 0.01, 0.001M HCl¹

ABSTRACT

Rates of dissolution of biotite in 0.1, 0.01, 0.001M HCl decrease as the proportion of ferric iron in octahedrally coordinated sites increases. This is interpreted as being partly due to a decrease in the rate of K exchange from oxidized biotite so that a smaller surface area is exposed to acid attack. The availability of structural cations (Mg, Mn, Zn, K, etc.) to plants growing on biotite rich soils will be a function of the oxidation state of structural iron in the biotite.

¹ Contribution from the Dep. of Soil Science and Plant Nutrition, Institute of Agriculture, University of Western Australia, Nedlands, W.A. 6009. This work was partly supported by the Australian Wheat Council.

² Lecturer in Soil Science, Research Officer and Professor of Soil Science, Department of Soil Science, respectively. Department of Soil Science and Plant Nutrition, University of Western Australia, Nedlands, W.A. 6009.

Received for publication May 3, 1972. Accepted for publication September 21, 1972.

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