Scoping study of the alternatives for managing waste containing chelating decontamination chemicals

Premuzic, E.T.; Manaktala, H.K.

doi:10.2172/12069575

Cited by 6 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(For leachability indices the larger the value the better the waste form.) Premuzic and Manaktala (1984) show other data for Dow polymer solidification of NS-1 concentrated solution where leach indices for Fe and Ni are greater than 10.5. The LOMI solution and its individual reagents, picolinic and formic acids, leach faster than do CAN-DECON, CITROX, and NS-1 reagents.…”

Section: Treatment and Disposal Of Spent Resinsmentioning

confidence: 52%

See 1 more Smart Citation

Characterization of radionuclide-chelating agent complexes found in low-level radioactive decontamination waste. Literature review

Serne¹,

Felmy²,

Cantrell³

et al. 1996

View full text Add to dashboard Cite

DISCLAIMERNUREGER-6124 is not a substitute for NRC regulations and compliance is not required. The approaches andor methods described in this NUREG/CR are provided for information only. Publication of this report does not necessarily constitute NRC approval or agreement with the information contained herein. AbstractUnder the regulations outlined in 10 CFR 61, the U.S. Nuclear Regulatory Commission is responsible for regulating the safe land disposal of low-level radioactive wastes that may contain organic chelating agents. Such agents include ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), . picolinic acid, oxalic acid, and citric acid, and can form radionuclide-chelate complexes that may enhance the migration of radionuclides from disposal sites.Data from the available literature indicate that chelates, most notably picolinate and EDTA, can leach from solidified decontamination wastes in moderate concentration (i.e., 1-100 ppm) and can potentially complex certain radionuclides in the leachates. The effects of the formation of such radionuclide-chelate complexes on the migration of radionuclides in groundwater systems is still difficult to quantitatively predict owing to the dependence of such migration on several factors including the chemical composition of the groundwater, the specific adsorbing surfaces present in the sods, and the ability of microorganisms to biodegrade the chelates. However, in general it appears that both EDTA and DTPA have the potential to mobilize radionuclides from waste disposal sites because such chelates can leach in moderate concentration, form strong radionuclide-chelate complexes, and can be recalcitrant to biodegradation. It also appears that oxalic acid and citric acid will not greatly enhance the mobility of radionuclides from waste disposal sites because these chelates do not appear to leach in high concentration, tend to form relatively weak radionuclide-chelate complexes, and can be readily biodegraded. In the case of picolinic acid, insufficient data are available on adsorption, complexation of key radionuclides (such as the actinides), and biodegradation to make definitive predictions, although the available data indicate that picolinic acid can chelate certain radionuclides in the leachates. Contents 3.12Mass spectra of (a) Cu(EDTA) and (b) Cu(HEDTA I Executive SummaryA variety of chemical decontamination processes are used to remove the build-up of radioactive-activated metals and corrosion products from the cooling systems of nuclear power plants. AU of these decontamination processes use chelating agents, such as ethylenediaminetetraaceec acid (EDTA), picolinic acid, oxalic acid, citric acid, and less frequently, diethylenetriaminepentaacetic acid (DTPA), to complex the released radionuclides. The complexed radionuclides and any excess uncomplexed chelates are then removed onto cation-or anion-exchange resins. The U.S. Nuclear Regulatory Commission (NRC), as defined in 10 CFR 61, is responsible for regulating the disposal of suc...

show abstract

Section: Treatment and Disposal Of Spent Resinsmentioning

confidence: 52%

“…Specific publications reviewed include Akers et al (1993);Ferrara (1991); Keiling and Manc (1991);McTsaac et al (1992), Morcos et al (1992); Neilson and Columbo (1982); ; Piciulo et al ( ,1986; Premuzic and Manaktala (1984); and So0 and Milian (1991).…”

Section: Treatment and Disposal Of Spent Resinsmentioning

confidence: 99%

Characterization of radionuclide-chelating agent complexes found in low-level radioactive decontamination waste. Literature review

Serne¹,

Felmy²,

Cantrell³

et al. 1996

View full text Add to dashboard Cite

show abstract

“…The formation of ethanedioic acid, more commonly referred to as oxalate, is of particular interest because it has been used as a complexing agent in nuclear operations. [5][6][7] Past degradation studies on a simulant containing a mixture of chelating and complexing agents yielded mono-and dicarboxylic acids, but not ethanedioic or hexanoic acids. 1~ Gamma-irradiation of citrate in a simulant yielded 2 carboxylic acids, but only a trace of ethanedioic acid.…”

Section: ~C02hmentioning

confidence: 99%

“…1 Compounds identified include chelating agents like EDTA, NTA, and HEDTA, as well as complexing agents like citric acid, all of which have been used extensively in the nuclear industry. [5][6][7] Mixed wastes may also contain myriad, structurally related chelator and complexor fragments, occasionally at relatively high concentrations, presumably derived from the radiolytic and/or chemical degradation of the parent chelating and complexing agents. 1,4 For example, analysis of Hanford's complex concentrate waste revealed the presence of 38 different chelator and complexor fragments.…”

Section: Introductionmentioning

confidence: 99%

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

Toste

1999

J Radioanal Nucl Chem

View full text Add to dashboard Cite

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.

show abstract

“…3 9 One waste in particular, a complex concentrate waste derived from reprocessing spent fuel at the Hanford site 20-plus years ago, was found to contain numerous nuclear-related organics. 3~ Compounds identified include chelating agents like EDTA, NTA, and HEDTA and complexing agents like citric acid, which have been used extensively in the nuclear industry as decontamination agents, etclO 12 Other mixed wastes analyzed also contain chelating and complexing agents. 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.…”

Section: Introduction*mentioning

confidence: 99%

Gamma radiolysis of EDTA in a simulated, mixed nuclear waste

Toste

1998

J Radioanal Nucl Chem

View full text Add to dashboard Cite

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.

show abstract

Scoping study of the alternatives for managing waste containing chelating decontamination chemicals

Cited by 6 publications

References 0 publications

Characterization of radionuclide-chelating agent complexes found in low-level radioactive decontamination waste. Literature review

Characterization of radionuclide-chelating agent complexes found in low-level radioactive decontamination waste. Literature review

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

Gamma radiolysis of EDTA in a simulated, mixed nuclear waste

Contact Info

Product

Resources

About