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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


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eichrom resin columns a new breakthrough

Eichrom Resin Columns: A New breakthrough

Anil Thakkar

Eichrom Users’ Group Workshop

May 3, 2005

Oak Ridge, TN

background details
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
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
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
Additional research continues…

A ‘non-ionic surfactant’ frit material found and put to test

teva column performance 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
TEVA Columns: % Pu Yields with 0.5M HCl*

*INEEL procedure uses 0.5M HCl to elute Pu

uteva columns u th yields
UTEVA Columns: % U & Th Yields

*Th eluted with 5M HCl/0.05M oxalic acid

improvements summary
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
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