Separation of radioactive strontium from natural samples by means of mixed-solvent anion exchange
A new procedure for isolation and determination of90Sr in real natural samples is presented. It consists of bringing natural samples in a soluble form suitable for separation on an ion-exchange column, separation of calcium from strontium by means of the anion exchanger Amberlite CG-400 and 0.25M HNO3 in methanol as eluent for calcium, and the determination of90Sr using a low level β-counter after elution with H2O, scavenging steps and SrCO3 precipitation. The method was tested with IAEA standards of natural samples with known contents of90Sr, and water samples, where the concentration of90Sr was previously determined by the standard IAEA procedure. The results obtained show that it is possible to isolate and determine low levels of90Sr in natural samples. The procedure is favorable because of the simple separation of radioaactive strontium without using fuming nitric acid.
KeywordsCalcium Precipitation Methanol Water Sample Nitric Acid
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