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Artificial Weathering of Oxidized Biotite: IV. The Inhibitory Effect of Potassium on Dissolution Rate¹

ABSTRACT

Rates of dissolution of oxidized biotites in 0.1M 0.01M HCl are severely depressed in the presence of 1M KCl. The amounts of Al, Mg, Mn dissolved in the first extraction are similar to those found without KCl, however, subsequent extractions remove these elements at 10–20% of the corresponding HCl rates. This effect may be due to a decreased rate of vermiculite formation, thereby reducing the effective basal area exposed to attack. A decrease in dissolution rate with increasing ferric iron content was still apparent in the presence of 1M KCl.

¹ Contribution from the Dep. of Soil Science and Plant Nutrition, Institute of Agriculture, Univ. of Western Australia, Nedlands, 6009, Western Australia.

² Senior Lecturer in Soil Science and Research Officer, respectively.

Received for publication September 29, 1973. Accepted for publication January 8, 1974.