About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in SSSAJ

  1. Vol. 33 No. 5, p. 684-690
     
    Received: Nov 25, 1968
    Published: Sept, 1969


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2136/sssaj1969.03615995003300050020x

Ion Selectivity of Micas as Influenced by Degree of Potassium Depletion1

  1. J. Le Roux and
  2. C. I. Rich2,3

Abstract

Abstract

The Rb/Sr selectivity coefficient of muscovite and biotite reached a maximum at an intermediate degree of K-depletion of these micas. The Rb/Sr ratio of ions absorbed from a solution, initially containing equivalent amounts of Rb and Sr, was determined for the two micas altered to different degrees to Mg-vermiculite. X-ray diffraction of the Rb-Sr treated vermiculites gave nonintegral peaks for the basal reflections, indicating random interstratification of Rb and Sr + Mg saturated layers. The results support previous proposals that selective sites for K are probably situated at wedge-shaped zones occurring at frayed edges and deeper within the altered mica particles. As K is removed from mica, the number of such wedges should first increase and then decrease. Selectivity of K and other large monovalent ions should also follow this same trend.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America