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Abstract

 

This article in SSSAJ

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


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doi:10.2136/sssaj1967.03615995003100020014x

Characterization of Fixed Strontium in Sesquioxide Gel-Kaolinite Clay Systems1

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

Abstract

Abstract

“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.

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