Comparison of analytical charge-form and equilibrium thermodynamic speciation of certain radionuclides

Conference · Wed Feb 01 04:00:00 EST 1984

OSTI ID:7008624

Jenne, E A; Cowan, C E; Robertson, D E

Calculating trace element speciation with a thermodynamic model is often challenged on the basis that the existing thermodynamic data are not sufficiently reliable. Water quality data and corresponding analytical charge-form speciation analyses were available for radionuclides occurring in a low-level radioactive groundwater. This offered a unique opportunity for comparing the results of an equilibrium thermodynamic model with the results of analytical charge-form speciation. The charge-form speciation was determined using the Battelle Large Volume Water Sampler, which contains consecutive layers of cation resin, anion resin and activated aluminum oxide for retention of cationic, anionic and non-ionic dissolved chemical species, respectively. The thermodynamic speciation of Cs, Cr, Fe, I, Mn, Mo, Na, and Zn was calculated using the MINTEQ geochemical model. Other radioactive elements (Ce, Co, Tc, Np, Pm and Sb) were speciated by hand calculation. Excellent agreement between the analytically determined charge-form and the thermodynamic speciation was observed for several radionuclides (/sup 54/Mn, /sup 144/Ce, /sup 131/I, /sup 24/Na, /sup 137/Cs, /sup 99/Mo, /sup 99/Tc, /sup 151/Pm, /sup 151/Np). Organic complexation by natural and/or synthetic organics in the waters may be important in the speciation of /sup 65/Zn, /sup 60/Co, /sup 131/I, /sup 59/Fe and possibly /sup 51/Cr. Both /sup 124/Sb and /sup 125/Sb appeared to be in redox disequilibria with the groundwater. 28 references, 2 tables.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 7008624
• Report Number(s): PNL-SA-12093; CONF-840408-13; ON: DE84011896
• Country of Publication: United States
• Language: English

Related Subjects

520301* -- Environment
Aquatic-- Radioactive Materials Monitoring & Transport-- Water-- (1987)
54 ENVIRONMENTAL SCIENCES
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CERIUM 144
CERIUM ISOTOPES
CESIUM 137
CESIUM ISOTOPES
CHROMIUM 51
CHROMIUM ISOTOPES
COMPARATIVE EVALUATIONS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ENVIRONMENTAL TRANSPORT
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GROUND WATER
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
IODINE 131
IODINE ISOTOPES
IRON 59
IRON ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MANGANESE 54
MANGANESE ISOTOPES
MASS TRANSFER
MINUTES LIVING RADIOISOTOPES
MOLYBDENUM 99
MOLYBDENUM ISOTOPES
NEPTUNIUM 239
NEPTUNIUM ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
PROMETHIUM 151
PROMETHIUM ISOTOPES
RADIOISOTOPES
RADIONUCLIDE MIGRATION
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SECONDS LIVING RADIOISOTOPES
SODIUM 24
SODIUM ISOTOPES
STABLE ISOTOPES
TECHNETIUM 99
TECHNETIUM ISOTOPES
THERMODYNAMICS
TIN 124
TIN 125
TIN ISOTOPES
VALENCE
WATER
YEARS LIVING RADIOISOTOPES
ZINC 65
ZINC ISOTOPES