engleski

Strontium isolation from natural samples with Sr resin and subsequent determination of 90Sr

The reliability of an 90Sr determination method was tested using an Sr extraction chromatographic resin for strontium isolation. The 90Sr-content in samples of vegetables, soil and water (obtained from Environmental Measurement Laboratory, USA) were determined and the results were controlled by classical methods and by using an anion exchanger and an alcohol solution of nitric acid for the strontium isolation. These methods were previously tested by determining 90Sr in IAEA 326 and 327 samples of soil. It is shown that the isolation process with Sr resin is simpler and faster than the classical and mixed solvent anion exchange methods. The efficiency of isolation on a Sr column depends on the resin quantity and separation conditions ; and is the highest with a Sr column, compared to the classical and anion-exchange methods. Experimental data and theoretical models were used to calculate the parameters that enable the estimation of optimum dimensions of the column for isolation. A simple relation is proposed for the calculation of breakthrough volume, which defines the sample and eluent volumes for an optimal strontium isolation.

90Sr; Sr resin; ion exchange resin; isolation; theoretical models of chromatography

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