Characterization of Fixed Strontium in Sesquioxide Gel-Kaolinite Clay Systems
1967
Frere, M. H. | Champion, D. F.
“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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