Solid phase separation and ICP-OES/ICP-MS determination of rare earth impurities in nuclear grade uranium oxide |
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Authors: | Smeer Durani M Krishnakumar K Satyanarayana |
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Institution: | 1. Department of Atomic Energy, Chemistry Group, Atomic Minerals Directorate for Exploration and Research, Begumpet, Hyderabad, 500629, AP, India
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Abstract: | A simple, effective and low cost solid phase extraction procedure was standardized for the trace and ultra-trace level determination of rare earth impurities, such as, Ce, Dy, Sm, Gd, Eu, Er etc. which act as neutron poisons, in nuclear grade uranium oxide (U3O8?>?99.9% by weight). The method involves selective separation of these elements as their fluorides with the help of activated charcoal from major uranium matrix followed by determination by ICP-MS and high resolution ICP-OES. The residual uranium content of the solution was <10???g/mL. The recovery of REEs ranges from 85 to 105%. The method was validated with nuclear grade uranium oxide standards CRM-I to CRM-V (BARC, Mumbai, India) in addition to some synthetic standards. The RSD of the method was ±12% (n?=?3). |
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