誘導結合プラズマ発光分析法によるリン酸塩鉱石中のウランの定量

概要

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Inductively coupled plasma atomic emission spectrometry (ICP-AES) was applied to the determination of uranium in phosphate rare earth minerals such as xenotime and monazite. The detection limits of uranium was ca. 0.4 ppm. The relative standard deviation was ca. 2%. There was no influence of the inorganic acids in the concentration range from 3 × 10^<-3> to 0.1mol/dm^3, but signal suppression was observed at concentrations above 0.2mol/dm^3. Determination of uranium in phosphate mineral solutions necessitated correction of spectral influeces from coexisting elements. The corrections were easily made from the contents of coexisting elements which were already known. Phosphate minerals were dissolved with hot concentrated sulfuric acid. After insoluble residue was filtrated, the solutions were diluted with water. These sample solutions were directly injected into the plasma. Uranium contents in phosphate minerals were measured by calibration curve method. The Uranium containing in xenotime and monazite were determined to be 0.39〜0.69%, 0.33〜0.40%, respectively.
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