About Us | Help Videos | Contact Us | Subscriptions



This article in SSSAJ

  1. Vol. 31 No. 2, p. 188-191
    Received: June 20, 1966
    Accepted: Nov 30, 1966

Request Permissions


Characterization of Fixed Strontium in Sesquioxide Gel-Kaolinite Clay Systems1

  1. M. H. Frere and
  2. D. F. Champion2



“Fixed” Sr is defined by the amount of radioactive Sr remaining with the solid phase after three extractions with 1N Sr(NO3)2. The amount of Sr fixed in a soil-water suspension increases with time in a manner characteristic of a slow diffusion process. Experiments with Fe or Al gel-kaolinite clay suspensions showed a similar behavior. The amount of fixation in gel-clay suspensions increased with pH to a level of about 6% of the adsorbed Sr at pH 8. The reaction was insensitive to the amount of gel and decreased with the aging of the gel-clay suspension. The level of fixation in the gel-clay suspensions was considerably less than observed in soils, particularly when acid pH's and aged systems are considered. Several exploratory experhaents indicate a silicate interface may be important in the fixation mechanism.

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

Copyright © . Soil Science Society of America