Gamma radiation effects on potassium pertechnetate in carbonate media

Said, K. Ben; Seimbille, Yann; Fattahi, Massoud; Houée-Levin⊥, Chantal; Abbé, Jean Charles

doi:10.1016/s0969-8043(00)00162-7

Cited by 13 publications

(4 citation statements)

References 13 publications

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“…Both medical and environmental studies concerned with the solubility and the complexation chemistry of technetium have encountered colloidal Tc(IV)-forms. Although the existence of the Tc colloids has been proven by various techniques, − their quantitative determination still remains an issue.…”

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confidence: 99%

Column Precipitation Chromatography: An Approach to Quantitative Analysis of Eigencolloids

Breynaert

Maes²

2005

Anal. Chem.

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A new column precipitation chromatography (CPC) technique, capable of quantitatively measuring technetium eigencolloids in aqueous solutions, is presented. The CPC technique is based on the destabilization and precipitation of eigencolloids by polycations in a confined matrix. Tc(IV) colloids can be quantitatively determined from their precipitation onto the CPC column (separation step) and their subsequent elution upon oxidation to pertechnetate by peroxide (elution step). A clean-bed particle removal model was used to explain the experimental results.

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mentioning

confidence: 99%

Column Precipitation Chromatography: An Approach to Quantitative Analysis of Eigencolloids

Breynaert

Maes²

2005

Anal. Chem.

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“…This method enables one to perform the quantitative separation of Tc(VII) and Tc(IV) in solution. 120,121 To establish the crystal structures of pertechnetates with different compositions, the dependence of the quadrupole coupling constant on the temperature in the 99 Tc NMR spectra was studied. 59,122,123 The in situ behaviour of technetium in radioactive wastes was investigated by MoÈ ssbauer absorption spectroscopy.…”

Section: Other Methodsmentioning

confidence: 99%

Technetium: behaviour during reprocessing of spent nuclear fuel and in environmental objects

Popova¹,

Тананаев²,

Rovnyi³

et al. 2003

Russ. Chem. Rev.

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“…According to BenSaid et al (Ben-Said et al 2001), the amount of reduced technetium in an irradiated system is less when carbonate is present than without, at least in a system with formate (HCOO -) present as a scavenger of certain radiolytic products (e.g., ·OH and ·H). Radiolytic CO 3 · -is also an oxidant that can serve to reoxidize partially reduced technetium based on the following interaction (Ben-Said et al 2001):…”

Section: Effects Of Carbonatementioning

confidence: 99%

Development of a Chemistry-Based, Predictive Method for Determining the Amount of Non-Pertechnetate Technetium in the Hanford Tanks: FY 2012 Progress Report

Rapko¹,

Bryan²,

Bryant³

et al. 2013

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Executive SummaryThis report describes investigations directed toward understanding the extent of the presence of highly alkaline soluble, non-pertechnetate technetium (n-Tc) in the Hanford Tank supernatants. The goals of this report are to: a) present a review of the available literature relevant to the speciation of technetium in the Hanford tank supernatants, b) attempt to establish a chemically logical correlation between available Hanford tank measurements and the presence of supernatant soluble n-Tc, c) use existing measurement data to estimate the amount of n-Tc in the Hanford tank supernatants, and d) report on any likely, processfriendly methods to eventually sequester soluble n-Tc from Hanford tank supernatants.The work described herein follows on a substantial literature developed in the 1990s and early 2000s that first identified the problem of the presence of n-Tc and led to a tentative identification of the species in at least two Hanford tank waste supernatants. This project attempted to correlate chemically relevant indicators for which quality-valid data exists in the TWINS database suitable for eventual extrapolation to as-yet untested tank supernatants. In addition, two other tangential tasks were undertaken. First, a model was developed that expanded upon a previously published model by Lukens et al. (2001), for the rate of reduction of pertechnetate by radiolysis and inorganic chemical-based processes. Using information obtained from TWINS, this model was applied to the Hanford tank supernatants to identify the rate of pertechnetate reduction in the various Hanford tank supernatants. Second, one proposed species for n-Tc, the complex [(CO) 3 Tc(H 2 O) 3 ] + , was prepared, and initial studies into its spectroscopic signature and chemical stability were performed.From this work, the only acceptable chemically based correlations with data from the TWINS database were that the fraction of n-Tc present negatively correlates with either of two, closely related variables: total dose experienced in the tank, and 137 Cs concentration in the tank supernatants. The observed inverse correlation is counterintuitive, but a possible explanation is discussed. However, the correlation should lend some insight as to which tanks might be tested to further validate and enhance the predictive value of this correlation.As noted above, chemical data, radiolysis constants and known chemical rate constants for the reaction of water radiolysis products with inorganic Hanford tank waste supernatant constituents were used to evaluate the relative rates of pertechnetate reduction in the Hanford tank supernatants. These results are summarized in the report. Interestingly, the reduction rate for pertechnetate is greatest in two tanks, AZ-101 and AZ-102, where the presence of n-Tc is not detected. However, this reduction only concerns the rate of pertechnetate reduction; the speciation of the reduced product is not addressed. Consequently, reduction of pertechnetate to the poorly alkaline-soluble technetium dioxide could ...

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Gamma radiation effects on potassium pertechnetate in carbonate media

Cited by 13 publications

References 13 publications

Column Precipitation Chromatography: An Approach to Quantitative Analysis of Eigencolloids

Column Precipitation Chromatography: An Approach to Quantitative Analysis of Eigencolloids

Technetium: behaviour during reprocessing of spent nuclear fuel and in environmental objects

Development of a Chemistry-Based, Predictive Method for Determining the Amount of Non-Pertechnetate Technetium in the Hanford Tanks: FY 2012 Progress Report

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