Simultaneous Spectrophotometric Determination of Uranium and Thorium by Flow Injection Analysis Using Selective Masking.
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- HIRANO Yoshihiro
- Department of Materials Technology, Faculty of Engineering, Chiba University
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- OGAWA Yuichi
- Department of Materials Technology, Faculty of Engineering, Chiba University
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- OGUMA Koichi
- Department of Materials Technology, Faculty of Engineering, Chiba University
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A flow injection system for the simultaneous determination of uranium and thorium has been developed by using selective masking and a spectrophotometric detector with two flow cells aligned with the same optical path. The injected sample solution was first mixed with a reagent solution containing Chromazurol S (CAS) and cetyltrimethylammonium chloride (CTMAC), and the total absorbance of uranium- and thorium-CAS complexes was measured in the first flow cell at 620 nm. The sample stream was then mixed with an EDTA solution in order to convert the thorium-CAS complex to a thorium-EDTA complex, and the absorbance of the uranium-CAS complex was measured in the second flow cell. The detection limits were 10 μg dm-3 for uranium and 7 μg dm-3 for thorium. The calibration graphs were linear (r < 0.9998) at least over the ranges of 0.1 to 10 mg dm-3 for uranium and 0.08 to 8 mg dm-3 for thorium. The RSDs were less than 1.5% (n = 3) in the calibration range. Uranium and thorium of up to the 6-fold concentration to each other could be determined in admixtures with relative errors of less than 3.3%. The sample throughput was 24 per hour. The proposed system was successfully applied to the analysis of a uranium-thorium ore mock solution by coupling with anion-exchange in a magnesium nitrate medium to eliminate interference from coexisting elements.
収録刊行物
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- Analytical Sciences
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Analytical Sciences 19 (2), 303-307, 2003
社団法人 日本分析化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204255329408
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- NII論文ID
- 130004440712
- 80015808545
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- NII書誌ID
- AA10500785
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- COI
- 1:CAS:528:DC%2BD3sXhtlOgtLs%3D
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- ISSN
- 13482246
- 09106340
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- NDL書誌ID
- 6443073
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- PubMed
- 12608764
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 使用不可