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Characterization of Fixed Strontium in Sesquioxide Gel-Kaolinite Clay Systems¹

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.

¹ Contribution from the US Soils Laboratory, Soil and Water Conser. Res. Div., ARS, USDA. The experimental work discussed herein was supported in part by the US Atomic Energy Commission. Presented before Div. S-2, Soil Sci. Soc. Amer., Kansas City, Mo., Nov. 1964.

² Soil Scientists, Beltsville, Md. D. F. Champion is now located at Ft. Collins, Colo.

Received for publication June 20, 1966. Accepted for publication November 30, 1966.