Technetium Sorption Media Review

Jb, Duncan; Se, Kelly; Ra, Robbins; Adams, Richard D.; Ma, Thorson; CC, None HAASS

doi:10.2172/1028213

Cited by 10 publications

(25 citation statements)

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“…The adjustment to 5 M sodium has two benefits. First, it provides a concentration range where SuperLig® 639 has been shown to perform well in removing pertechnetate (Duncan et al 2011). Second, higher concentrations of sodium tend to create supernatants with densities greater than that of SuperLig® 639, which makes performing the column test in step 4 more problematic due to resin floating when exposed to the supernatant.…”

Section: Approach/discussionmentioning

confidence: 99%

“…Step 4 involves passing the (modified as per steps 2 and 3) candidate supernatant through a pertechnetate getter material. A variety of materials have been tested for this purpose, including SuperLig® 639 (IBC Advanced Technologies, American Fork, Utah), TEVA resin (Eichrom Technologies LLC, Lisle, Illinois), Reillex®-HPQ (Vertellus Specialties Inc., Indianapolis, Indiana), ABEC-2000 (Eichrom Technologies LLC, Lisle, Illinois), AG MP-1 (Bio-Rad, Hercules, California), and Purolite-A530E (Purolite Corporation, Bala Cynwyd, Pennsylvania), to name just a few of the most studied for this purpose (Duncan et al 2011). Liquid-liquid systems are also available for such separations but are not recommended (Dyrkacz et al 1979 and references therein).…”

Section: Approach/discussionmentioning

confidence: 99%

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Protocol for Identifying the Presence of and Understanding the Nature of Soluble, Non-pertechnetate Technetium in Hanford Tank Supernatants

Rapko¹

2014

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Executive SummaryThe purpose of this report is twofold: first, to propose a test protocol for identifying the presence of soluble, non-pertechnetate Tc (n-Tc) in alkaline, high ionic strength, Hanford tank supernatants, and second, to evaluate various methods of obtaining information about the nature of the identified, non-pertechnetate species.The proposed protocol addresses three questions: 1) is n-Tc present and what fraction of the total soluble Tc is present in this form, 2) is there an interference at m/e 99 in the inductively coupled plasma mass spectrometry (ICP-MS) that gives false positives in a test for n-Tc, and 3) is there another isotope that could act as an interference in a test for n-Tc by liquid scintillation counting.For ALARA (as low as reasonably achievable) reasons, the protocol involves an initial Cs decontamination by contact with the Cs selective IE-911 ion exchanger. It is recommended that the Cs-depleted supernatant be spiked with a non-Tc-99 source (likely Tc-99m) of pertechnetate to allow an independent assessment of pertechnetate and total technetium behaviors during the test. The solution is then passed through a column containing a pertechnetate getter. Because of its extensive use with Hanford tank waste supernatants, SuperLig® 639 is recommended as the pertechnetate getter. The resulting effluent is sampled for analysis by gamma energy analysis, liquid scintillation counting for beta activity, and ICP-MS for its mass 99 concentration.Should there be a significant difference in pertechnetate versus total technetium behavior, the effluent is exhaustively oxidized by a persulfate/microwave digestion, adjusted as needed in composition, passed again through an appropriate pertechnetate getter, and resampled. From analysis of these sample results, the questions posed above can be addressed.The report concludes with an evaluation of a variety of spectroscopic methods that might be used either to identify n-Tc spectroscopically in Hanford tank waste supernatant or to gain insight into the chemical structure of n-Tc. It is concluded that most methods evaluated either are unsuitable, sufficiently insensitive to preclude use at the technetium concentrations present in Hanford tank waste supernatant, or would require significant methods development before they might be effective in n-Tc species analysis. The two methods currently available that can supply useful speciation information are X-ray absorption spectroscopy (of various types) and Tc-99 nuclear magnetic resonance spectroscopy.

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Section: Approach/discussionmentioning

confidence: 99%

Section: Approach/discussionmentioning

confidence: 99%

Protocol for Identifying the Presence of and Understanding the Nature of Soluble, Non-pertechnetate Technetium in Hanford Tank Supernatants

Rapko¹

2014

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“…A number of materials have been identified as possible elutable ion exchange media (Duncan et al 2011). SuperLig® 639, ABEC 2000, Dowex® 1X8, and Reillex® HPQ have been tested with Hanford tank waste.…”

Section: Elutable Ion Exchangementioning

confidence: 99%

“…SuperLig 639 had previously been selected by BNFL for WTP pertechnetate separations before a decision was made to remove that process step. It was rated highest by Duncan et al (2011) in their review of sorption media for Tc removal from LAW. The one notable concern for the SuperLig 639 separations method is that it is effective only for pertechnetate ion.…”

Section: Elutable Ion Exchangementioning

confidence: 99%

“…The loaded resin would then be dried and placed in a suitable disposal container or would be further treated before disposal. Among the non-elutable ion exchange resins are Purolite A520E and A530E, and Kurion TAM (a tin apatite sorption media) (Duncan et al 2011). Reillex HPQ could also be used as a non-elutable ion exchange resin (McCabe et al 2012).…”

Section: Non-elutable Ion Exchangementioning

confidence: 99%

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Technetium Immobilization Forms Literature Survey

Westsik¹,

Cantrell²,

Serne³

et al. 2014

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Anion Exchange Resins for the Selective Separation of Technetium from Uranium in Carbonate Solutions

Long

Goff

Ware

et al. 2012

Ind. Eng. Chem. Res.

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In alkaline carbonate solutions both technetium and uranium exist as anionic species, TcO 4 − and UO 2 (CO 3 ) 3 4− , which makes separating Tc and U from each other more challenging compared to acidic PUREX type solutions where uranium forms neutral or cationic complexes. We tested the batch separation of 99 Tc, 238 U, and 239 Pu from carbonate solutions using anion exchange resins with different properties, including Purolite A530E, Reillex HPQ, and Dowex Marathon WBA. Overall, the highest K d values for pertechnetate were achieved using the strong base resins in solutions of the lowest carbonate concentration. Pretreating the resins in higher carbonate concentrations before use was shown to increase the K d values for pertechnetate. The measured K d values for uranium generally were low, resulting in high selectivity for the separation of pertechnetate from uranium in carbonate solutions.

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Technetium Sorption Media Review

Cited by 10 publications

References 0 publications

Protocol for Identifying the Presence of and Understanding the Nature of Soluble, Non-pertechnetate Technetium in Hanford Tank Supernatants

Protocol for Identifying the Presence of and Understanding the Nature of Soluble, Non-pertechnetate Technetium in Hanford Tank Supernatants

Technetium Immobilization Forms Literature Survey

Anion Exchange Resins for the Selective Separation of Technetium from Uranium in Carbonate Solutions

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