Sorption of radioactive elements on synthetic sorbents
Abstract
An important and challenging task of the modern analytical practice is the analysis of objects with complex chemical compositions which include traces of thorium(IV) and uranium(VI) and can be found anywhere in the environment. In this regard, studies of increased sensitivity and selectivity of the analysis (sorption-spectrophotometric methods) are very promising. An effective method is the preliminary selective extraction and concentration of elements by complexing polymeric sorbents. To perform the photometric determination of uranium(VI) and thorium(IV) we studied a sorbent synthesised by means of the modification of a copolymer of maleic anhydride with styrene. The study determined the optimum conditions for the sorption of radioactive metals on the synthesised sorbent. The maximum degree of sorption of thorium(IV) was observed when the рН was 4. The maximum sorption of uranium(VI) was observed when the рН was 6. We also studied the desorption of the absorbed metal from the sorbent. The maximum degree of extraction of uranium(VI) and thorium(IV) from the sorbent was observed in perchloric acid.
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