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Kinetics of Potassium Release from Biotite and Muscovite in Sodium Tetraphenylboron Solutions
Author(s) -
Reed M. G.,
Scott A. D.
Publication year - 1962
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1962.03615995002600050010x
Subject(s) - biotite , muscovite , mica , diffusion , particle size , particle (ecology) , chemistry , kinetics , potassium , mineralogy , sodium , inorganic chemistry , analytical chemistry (journal) , thermodynamics , materials science , chromatography , geology , physics , quartz , metallurgy , organic chemistry , oceanography , quantum mechanics
Abstract A mathematical expression that describes the release of interlayer K from mica particles in NaCl‐NaTPB solutions was derived. The mica particles were assumed to be circular discs and the rate determining process for the release of K was considered to be the simultaneous diffusion of K and Na within the particle. Therefore, this derivation involved the solution of a two‐dimensional radial diffusion problem in which K diffuses from a receding weathering front to the periphery of the particle. The validity of these assumptions and the resulting expression was evaluated with experimentally determined K release data. The experimental data were obtained with different size fractions of biotite and muscovite placed in NaCl‐NaTPB solutions for different periods of time. The results obtained with each size fraction were accurately described by the theoretical expression. In the case of a 50 to 62 µ biotite fraction, this was true even though 90% of the K was released in a period of 113 hours. On the other hand, the expression did not account for the effect of particle size. A modification of the expression, based on the experimental results, however, accounted for the effects of both time and particle size.