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Report No.
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Rapid determination of trace uranium in liquid wastes from spent nuclear-fuel reprocessing plants using on-line solid-phase extraction / electrochemical detection

Taguchi, Shigeo; Surugaya, Naoki; Kurosawa, Akira; Hiyama, Toshiaki; Tanaka, Tatsuhiko*

An on-line analysis system using a solid-phase extraction column coupled to electrochemical detection has been developed for rapid determination of small amounts of uranium in liquid wastes of spent nuclear-fuel reprocessing plants. A sample solution with a concentration of 3 M HNO$$_{3}$$ was loaded onto the column: packed with U/TEVA$$^{textregistered}$$ resin. The interference elements were rinsed by passing 3 M HNO$$_{3}$$ through the column. The adsorbed uranium was eluted with 0.1 M HNO$$_{3}$$. The eluate was directly introduced into a flow-electrolysis cell. The result of five repeated analyses for a standard solution containing 2.5 $$mu$$g (0.1 mL at 25 $$mu$$g mL$$^{-1}$$) of uranium was found to be 2.5 $$pm$$ 0.025 $$mu$$g (mean $$pm$$ 1 $$sigma$$). The detection limit calculated from 3 times the standard deviation of background current was 56 ng. The analysis time required for one sample was within 5 min. The recoveries of uranium in actual nuclear waste reprocessing solutions were 92% $$sim$$ 112%.

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Category:Chemistry, Analytical

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