Characterization of radionuclide-chelating agent complexes found in low-level radioactive decontamination waste. Literature review
- Pacific Northwest National Lab., Richland, WA (United States)
The US 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 can leach from solidified decontamination wastes in moderate concentration (1--100 ppm) and can potentially complex certain radionuclides in the leachates. 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.
- Research Organization:
- Nuclear Regulatory Commission, Washington, DC (United States). Div. of Regulatory Applications; Pacific Northwest National Lab., Richland, WA (United States)
- Sponsoring Organization:
- Nuclear Regulatory Commission, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 219284
- Report Number(s):
- NUREG/CR--6124; PNL--8856; ON: TI96009672
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHELATING AGENTS
CHEMICAL REACTIONS
CORROSION PRODUCTS
DECONTAMINATION
GEOCHEMISTRY
GROUND WATER
LEACHING
LOW-LEVEL RADIOACTIVE WASTES
MOLECULAR STRUCTURE
NUCLEAR POWER PLANTS
RADIOACTIVE WASTE DISPOSAL
RADIOISOTOPES
RADIONUCLIDE MIGRATION
SOILS
SORPTION
SORPTIVE PROPERTIES
THERMODYNAMICS