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This article in SSSAJ

  1. Vol. 37 No. 1, p. 29-33
     
    Received: May 3, 1972


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doi:10.2136/sssaj1973.03615995003700010014x

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

  1. R. J. Gilkes,
  2. R. C. Young and
  3. J. P. Quirk2

Abstract

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.

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