共存离子对时间分辨荧光法测定痕量铀的影响
时间分辨荧光法分析痕量铀具有灵敏度高、操作简便等优点,但是受共存离子的影响很大,准确度评价较低,分析结果误差过大。本工作研究了时间分辨荧光法测定焦磷酸体系中UO2^2＋时几种干扰离子如H＋、Fe^3＋、NO3^-等的影响,为痕量铀样品预处理方法的确定提供重要依据。结果表明：H^＋对UO2^2＋的荧光猝灭主要表现为荧光物质的破坏;NO3^-对铀络合物荧光体系的影响表现为对激发光的吸收;Fe^3＋的影响表现为对激发光和荧光的吸收。对于质量浓度为2μg/L的铀溶液,当c（H^＋）=0.037 5mol/L时,UO2＋2的荧光强度下降了44.4%;当ρ（Fe^3＋）=20mg/L时,UO2^2＋的荧光...
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| Published in | 核化学与放射化学 Vol. 37; no. 1; pp. 41 - 44 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国原子能科学研究院 放射化学研究所,北京,102413
2015
|
| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-9950 |
| DOI | 10.7538/hhx.2015.37.01.0041 |
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| Abstract | 时间分辨荧光法分析痕量铀具有灵敏度高、操作简便等优点,但是受共存离子的影响很大,准确度评价较低,分析结果误差过大。本工作研究了时间分辨荧光法测定焦磷酸体系中UO2^2＋时几种干扰离子如H＋、Fe^3＋、NO3^-等的影响,为痕量铀样品预处理方法的确定提供重要依据。结果表明：H^＋对UO2^2＋的荧光猝灭主要表现为荧光物质的破坏;NO3^-对铀络合物荧光体系的影响表现为对激发光的吸收;Fe^3＋的影响表现为对激发光和荧光的吸收。对于质量浓度为2μg/L的铀溶液,当c（H^＋）=0.037 5mol/L时,UO2＋2的荧光强度下降了44.4%;当ρ（Fe^3＋）=20mg/L时,UO2^2＋的荧光强度基本猝灭完全。 |
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| AbstractList | O657.4; 时间分辨荧光法分析痕量铀具有灵敏度高、操作简便等优点,但是受共存离子的影响很大,准确度评价较低,分析结果误差过大。本工作研究了时间分辨荧光法测定焦磷酸体系中UO2+2时几种干扰离子如 H +、Fe3+、NO-3等的影响,为痕量铀样品预处理方法的确定提供重要依据。结果表明：H +对 UO2+2的荧光猝灭主要表现为荧光物质的破坏；NO-3对铀络合物荧光体系的影响表现为对激发光的吸收；Fe3+的影响表现为对激发光和荧光的吸收。对于质量浓度为2μg/L 的铀溶液,当 c(H +)=0.0375 mol/L 时,UO2+2的荧光强度下降了44.4%；当ρ(Fe3+)=20 mg/L 时,UO2+2的荧光强度基本猝灭完全。 时间分辨荧光法分析痕量铀具有灵敏度高、操作简便等优点,但是受共存离子的影响很大,准确度评价较低,分析结果误差过大。本工作研究了时间分辨荧光法测定焦磷酸体系中UO2^2＋时几种干扰离子如H＋、Fe^3＋、NO3^-等的影响,为痕量铀样品预处理方法的确定提供重要依据。结果表明：H^＋对UO2^2＋的荧光猝灭主要表现为荧光物质的破坏;NO3^-对铀络合物荧光体系的影响表现为对激发光的吸收;Fe^3＋的影响表现为对激发光和荧光的吸收。对于质量浓度为2μg/L的铀溶液,当c（H^＋）=0.037 5mol/L时,UO2＋2的荧光强度下降了44.4%;当ρ（Fe^3＋）=20mg/L时,UO2^2＋的荧光强度基本猝灭完全。 |
| Abstract_FL | Interfering ions are the main influencing factors to time resolved fluorescence (TRF)analyses of trace uranium.The influence of H + ,Fe3 + and NO-3 are studied in this paper.The fluorescence intensity of uranyl fluorescent complex is greatly affected by nitric acid.The fluorescence are completely quenched when the concentration of nitric acid is 0.075 mol/L.The concentration and lifetime of fluorescent complex are reduced by the addi-tion of H + .The fluorescence intensity is also affected by Fe3 + and NO-3 because of the absorption of exciting light. |
| Author | 苏涛 梁靓 谈树苹 吴继宗 |
| AuthorAffiliation | 中国原子能科学研究院放射化学研究所,北京102413 |
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| Author_FL | SU Tao WU Ji-zong LIANG Liang TAN Shu-ping |
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| Author_xml | – sequence: 1 fullname: 苏涛 梁靓 谈树苹 吴继宗 |
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| Copyright | Copyright © Wanfang Data Co. Ltd. All Rights Reserved. |
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| DocumentTitleAlternate | Influence of Interfering Ions on Analyses of Trace Uranium by Time Resolved Fluorescence Method |
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| EndPage | 44 |
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| Keywords | time resolved fluorescence 时间分辨荧光 铀酰离子 uranyl cation interfering ions 共存离子 |
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| Notes | SU Tao, LIANG Liang, TAN Shu-ping, WU Ji-zong（China Institute of Atomic Energy, P. O. Box 275（88）, Beijing 102413, China） 11-2045/TL uranyl cation; time resolved fluorescence; interfering ions Interfering ions are the main influencing factors to time resolved fluorescence （TRF） analyses of trace uranium. The influence of H^＋ , Fe^3＋ and NO3^- are studied in this paper. The fluorescence intensity of uranyl fluorescent complex is greatly affected by nitric acid. The fluorescence are completely quenched when the concentration of nitric acid is 0. 075 mol/L. The concentration and lifetime of fluorescent complex are reduced by the addition of H^＋. The fluorescence intensity is also affected by Fe^3＋ and NO3^- because of the absorption of exciting light. |
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| Publisher | 中国原子能科学研究院 放射化学研究所,北京,102413 |
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| SubjectTerms | 共存离子 时间分辨荧光 铀酰离子 |
| Title | 共存离子对时间分辨荧光法测定痕量铀的影响 |
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