Simple fluorimetric determination of uranium

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Other Title
  • けい光測定による微量ウランの簡易迅速定量
  • ケイコウ ソクテイ ニヨル ビリョウ ウラン ノ カンイ ジンソク テイリョウ

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Abstract

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 (310) ml of concentrated hydrochloric acid, and is boiled for a few minutes to expel CO2 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 910 with aqueous ammonia. The UO22+ is then coprecipitated with Zn3(PO4)2. The fluorescence intensity of the uranyl ion by 365 nm excitation is measured at 520 nm. Quencher ions such as Mn2+ or large amounts of Ca2+ and Mg2+ 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 (0.0020.1) 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.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 28 (10), 616-618, 1979

    The Japan Society for Analytical Chemistry

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