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Design of Microchannel Suitable for Packing with Anion Exchange Resins: Uranium Separation from Seawater Containing a Large Amount of Cesium

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Abstract

We present a resin-packed microchannel that can reduce the radiation exposure risk and secondary radioactive wastes during uranium (U) separation by downscaling the separation using a microchip. Two types of microchips were designed to densely pack the microchannels with resins. The microchannels had almost the same cross-sectional area, but different outer circumferences. A satisfactory separation performance could be obtained by arranging more than ca. 10 resins along the depth and width of the microchannels. A resin-packed microchannel is an effective separation technique for determining the U concentration via inductively coupled plasma mass spectrometry owing to its ability to avoid the contamination of equipment by cesium, and to reduce the matrix effect. The size of the separation site was scaled down to <1/5000 compared to commonly used counterparts. The radiation exposure risk and secondary radioactive wastes can be reduced by 10- and 800-fold, respectively, using a resin-packed microchannel.

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Acknowledgments

Lns and U were quantified using ICP-MS in the Laboratory Building No. 4 (Lab4) of the Japan Atomic Energy Agency. We would like to thank Dr. Shiho Asai of the National Institute of Advanced Industrial Science and Technology and Dr. Yoshikazu Koma of Collaborative Laboratories for Advanced Decommissioning Science (CLADS) of the Japan Atomic Energy Agency for fruitful discussions on performance evaluation of resin-packed microchannel 1.

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Authors and Affiliations

  1. Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Naka, Ibaraki, 319-1195, Japan

    Kazuki Ouchi & Yoshihiro Kitatsuji

  2. Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1-N1-6 O-okayama, Meguro, Tokyo, 152-8550, Japan

    Takehiko Tsukahara, Aileen Brandt & Yoshiki Muto

  3. Graduate School of Science and Engineering, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki, 310-8512, Japan

    Nozomi Nabatame

Authors
  1. Kazuki Ouchi
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  2. Takehiko Tsukahara
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  3. Aileen Brandt
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  4. Yoshiki Muto
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  5. Nozomi Nabatame
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  6. Yoshihiro Kitatsuji
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Correspondence to Kazuki Ouchi.

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Ouchi, K., Tsukahara, T., Brandt, A. et al. Design of Microchannel Suitable for Packing with Anion Exchange Resins: Uranium Separation from Seawater Containing a Large Amount of Cesium. ANAL. SCI. 37, 1789–1794 (2021). https://doi.org/10.2116/analsci.21P110

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  • DOI: https://doi.org/10.2116/analsci.21P110

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