engleski

Separation of strontium from complex samples and determination of Sr-89, 90

Among all radionuclides which are released into nature one of the three most studied is 90Sr. Reason for this lies in the fact that radioactive strontium isotopes are highly radiotoxic fission products (especially 90Sr with long half life), and as such they were an interesting subject for various kinds of investigations, from their distribution and behavior in natural systems to their influence on human health. As a rule, the determination of radioactive strontium is complicated and time-consuming, especially if isotope 89Sr is present in sample. Therefore, the main purpose of this work is describing and comparing the some novel procedures for “ rapid” radioactive strontium determination. In one procedure, strontium is isolated from samples on the column filled with Sr resin by binding of strontium to the resin and successive elution with HNO3. In the second method strontium and yttrium are bound on to anion exchange column from alcoholic solutions of nitric acid. The optimum mixture of alcohols for sample binding is a mixture of ethanol and methanol with the volume ratio 1:3. Strontium and yttrium are separated from Mg, Ca, K, and other elements by elution with 0.25 M HNO3 in the mixture of ethanol and methanol. The described methods were tested by determining of 89, 90Sr in different kind of samples. It is shown that the procedure with the Sr resin is simpler and faster in the phase of the isolation on the column in comparison with the procedure with the anion exchanger. The procedure with the mixed solvent anion exchange, however, enables the simultaneous isolation of yttrium and strontium and rapid determination of 89, 90Sr. It is also shown that the efficiency of isolation on the column depends on kind of sample and column dimension.

89; 90Sr isolation; anion exchanger; mixed solvent; Sr resin

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