Analysis of organics in highly radioactive nuclear wastes

Toste, A.P.; Lechner-Fish, T. J.; Hendren, David J.; Scheele, R.D.; Richmond, W.G.

doi:10.1007/bf02036387

Cited by 24 publications

(11 citation statements)

References 9 publications

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“…The methylation reaction, combined with GC and GC/MS analysis, has worked very well, even quantitatively, for analyzing parent organics like NTA, as well as myriad chelator and complexor fragments. 1,4,8,9 Moreover, comparisons between this study and earlier ones offer valuable insights on organic degradation in mixed wastes. However, no single analytical procedure is capable of isolating and characterizing the complex mixtures of organics often present in mixed wastes.…”

Section: Organic Recoveries and Nta Degradationmentioning

confidence: 93%

Detailed study of the γ-radiolysis of nitrilotriacetic acid in a simulated, mixed nuclear waste

Toste

1999

J Radioanal Nucl Chem

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Gamma radiolysis of a simulant of an actual mixed waste, composed of nitrilotriacetic acid (NTA) and an inorgamc matrix, at y-doses ranging from 0-7.5-106+10% R in a 6~ resulted in total NTA degradation,, but I0.8% of the simulant's original organic content remained. Radiolysis yielded 4 chelator fragments and 2 carboxylic acids, all formed at different rates. The chelator fragment N-(Methylamine)iminodiacetic acid (MAIDA) dominated at low y-doses, while N-[N'-amino(2-iminoethyl)]iminodiacetic acid (AIEIDA) dominated at high y-doses. Chemical degradation control studies revealed that the harsh chemistry of the inorganic matrix caused only 20.7% NTA degradation and formation of only 2 chelator fragments, while the heat generated by the ~ (95 ~ had little additional impact.

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Section: Organic Recoveries and Nta Degradationmentioning

confidence: 93%

Detailed study of the γ-radiolysis of nitrilotriacetic acid in a simulated, mixed nuclear waste

Toste

1999

J Radioanal Nucl Chem

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“…3,5,7 9 Considerable research indicates that such compounds may complicate the management of nuclear wastes by destabilizing waste forms, e.g., cementitious grouts, or by enhancing the subsurface migration of radionuclides in the environment 13 16 Analyses of mixed wastes also reveal the presence of myriad, structurally related chelator and complexor fragments, occasionally at relatively high concentrations, presumably derived from the degradation of the chelating and complexing agents. 3,5,8,9 For example, Hanford's complex concentrate waste contained 38 different chelator and complexor fragments 3 Chelator fragments have also been detected in heated and irradiated aqueous solutions of chelating and complexing agents. 17 19 Their presence in actual mixed wastes indicates that the organic content of nuclear wastes is dynamic, not static.…”

Section: Introduction*mentioning

confidence: 97%

Gamma radiolysis of EDTA in a simulated, mixed nuclear waste

Toste

1998

J Radioanal Nucl Chem

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The effects of 7-irradiation on EDTA degradation have been studied. A simulant of Hanford's complex concentrate was prepared by adding EDTA to an inorganic matrix which was formulated based on past analyses of the actual Hanford complex concentrate waste. For the radiolysis study, aliquots of the simulated waste were then 7-irradiated. Each waste sample was analyzed to monitor the appearance of degradation products. Based on the results of this study, an assessment of the impact of EDTA degradation on the management of mixed wastes is offered.

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“…The origin of mixed wastes can be quite varied. Some have been generated during reprocessing of spent nuclear fuel, while others are generated in commercial nuclear operations [1][2][3][4][5]. Organic substances present in radioactive wastes make the waste management upon storage and disposal more difficult.…”

Section: Introductionmentioning

confidence: 99%