Abstract
A simple and rapid method based on solid phase extraction chromatography (SPEC) has been developed for the determination of 90Sr in environmental samples. The SPEC method consists of three steps, namely, (1) carbonate precipitation of alkaline earths, (2) column separation of strontium using 4,4′(5′)-bis(tert-butylcyclohexano)-18-crown-6 based Sr spec resin and (3) beta counting of SrCO3 using low background gas flow counter. Minimum detection limit (MDL) of low beta gas flow counter is 1.42 Bq/kg for 10,000 s counting time. The capacity of the column for strontium was about 12.2 ± 0.5 mg of Sr per g of Sr spec resin. The SPEC method using Sr spec resin was standardized with 90Sr spiked samples and tested on sediment samples of Mumbai harbour bay. The average activity concentration of 90Sr in sediment samples was found to be 2.2–13.7 Bq/kg. The results obtained by SPEC method have been found to be in good agreement with conventional gravimetric method.
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