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Enhanced Resin Columns for Improved Radiochemical Separation Efficiency

Discover the latest breakthrough in resin column technology discussed at the Eichrom Users’ Group Workshop on May 3, 2005 in Oak Ridge, TN. Learn about the investigation into stripping issues of Th on TEVA prepacked columns and the identified main cause: column frits. Explore the impact of different frit types on elution efficiency and performance test results with non-ionic surfactant frit material. Find out about improvements and future inventory plans for resin column products.

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Enhanced Resin Columns for Improved Radiochemical Separation Efficiency

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  1. Eichrom Resin Columns: A New breakthrough Anil Thakkar Eichrom Users’ Group Workshop May 3, 2005 Oak Ridge, TN

  2. Background details • Stripping issues of Th on TEVA prepacked columns reported by numerous customers • Investigated all the components of the prepacaked column to trouble shoot the problem: resin, column body, resin bead size, frits….

  3. Previously discussed investigations…. • Column frits identified as the main cause of the problem • Investigations on frits led to the understanding of different frit types: • Frits with ‘ionic surfactant’ • Impact Th elution from TEVA columns • Impact low level U elution on UTEVA columns • Frits with ‘no surfactant’ • Measured slow flow rates at gravity • Mechanical pressure required to start the flow • Measured inconsistent flow rates

  4. Additional issues reported • Poor elution of low level U on UTEVA columns reported • An inconsistent elution of Th on UTEVA columns has been observed

  5. Additional research continues… A ‘non-ionic surfactant’ frit material found and put to test

  6. TEVA Column: Performance Test • Columns packed with non-ionic frit material • Measured performance of columns over a period oftime

  7. TEVA Columns: % Th Yields

  8. TEVA Columns: % Pu Yields with 0.5M HCl* *INEEL procedure uses 0.5M HCl to elute Pu

  9. TEVA Columns: % Am Yields(Am/ Lanthanide Separation)

  10. TEVA Columns: % Tc-99 Yields

  11. UTEVA, TRU, Sr and Ln columns tested after 2 weeks of packing

  12. UTEVA Columns: % U & Th Yields *Th eluted with 5M HCl/0.05M oxalic acid

  13. TRU Columns: % Am & Pu Yields

  14. Sr Columns: % Sr Yields & Recoveries

  15. Ln Columns: % Ac-228 Yields

  16. Improvements & Summary • Non-ionic surfactant frits improve performance • Th elution on TEVA • Th elution on UTEVA • Pu elution on TEVA • No impact observed on the performance of the following products with non-ionic frits • Am & Pu on TRU resin • Tc-99, Am on TEVA resin • Sr elution on Sr resin • Ac elution on Ln resin

  17. Future resin column inventory • Preliminary evaluation of prepacked column products with the new frits (non-ionic surfactant) has been extremely satisfactory • New frit inventory for future production has been ordered • Current inventory has old frits (ionic surfactant) in the prepacked column products • Any users of TEVA resin and UTEVA resin prepacked columns may consider cartridges in the interim • Contact Eichrom for further assistance

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