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Eichrom Resin Columns: A New breakthrough. Anil Thakkar Eichrom Users’ Group Workshop May 3, 2005 Oak Ridge, TN. Background details. Stripping issues of Th on TEVA prepacked columns reported by numerous customers
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Eichrom Resin Columns: A New breakthrough Anil Thakkar Eichrom Users’ Group Workshop May 3, 2005 Oak Ridge, TN
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….
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
Additional issues reported • Poor elution of low level U on UTEVA columns reported • An inconsistent elution of Th on UTEVA columns has been observed
Additional research continues… A ‘non-ionic surfactant’ frit material found and put to test
TEVA Column: Performance Test • Columns packed with non-ionic frit material • Measured performance of columns over a period oftime
TEVA Columns: % Pu Yields with 0.5M HCl* *INEEL procedure uses 0.5M HCl to elute Pu
UTEVA, TRU, Sr and Ln columns tested after 2 weeks of packing
UTEVA Columns: % U & Th Yields *Th eluted with 5M HCl/0.05M oxalic acid
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
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