けい光測定による微量ウランの簡易迅速定量

概要

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A rapid and simple fluorimetric method for the quantitative analysis of trace amounts of uranium was established. The procedure is as follows : A sample solution of about 500 ml containing less than 0.1 mg of uranium is acidified with (3〜10) ml of concentrated hydrochloric acid, and is boiled for a few minutes to expel CO_2 gas. To this solution are added each 50 ml portions of 4.6×10^<-2> M zinc nitrate and 3.6×10^<-2> M ammonium dihydrogenphosphate solutions, and pH is brought to 9〜10 with aqueous ammonia. The UO_2^<2+> is then coprecipitated with Zn_3(PO_4)_2. The fluorescence intensity of the uranyl ion by 365 nm excitation is measured at 520 nm. Quencher ions such as Mn^<2+> or large amounts of Ca^<2+> and Mg^<2+> cause the interferences. The separation of these ions is necessary prior to the application of the above procedure. The calibration curve was linear over the range of (0.002〜0.1) mg of uranium. This method was applied to the determination of uranium in the sea water at Oarai, with the result of 0.004 mg/l.
社団法人日本分析化学会の論文
1979-10-05