Critical review of the chemistry and thermodynamics of technetium and some of its inorganic compounds and aqueous species

Technical Report · Thu Sep 15 04:00:00 EDT 1983

DOI:https://doi.org/10.2172/5580852· OSTI ID:5580852

Rard, J A

Chemical and thermodynamic data for Technetium (Tc) and some of its inorganic compounds and aqueous species are reviewed here. Major emphasis is given to systems with potential geochemical applications, especially the geochemistry of radioactive waste disposal. Compounds considered include oxides, hydroxides, hydrates oxides, halides, oxyhalides, double halides, and sulfides. The aqueous species considered include those in both noncomplexing media (pertechnetates, technetates, aquo-ions, and hydrolyzed cations) and complexing media (halides, sulfates, and phosphates). Thermodynamic values are recommended for specific compounds and aqueous ions when reliable experimental data are available. Where thermodynamic data are inadequate or unavailable, the chemistry is still discussed to provide information about what needs to be measured, and which chemistry needs to be clarified. A major application of these thermodynamic data will be for chemical equilibrium modeling and for construction of potential-pH diagrams for aqueous solutions. Unfortunately, the present lack of data precludes such calculations for complexing aqueous media. The situation is much better for noncomplexing aqueous media, but the chemistry and thermodynamics of cationic Tc(V) species and hydrolyzed Tc(III) species are poorly understood. 240 references, 6 tables.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5580852
• Report Number(s): UCRL-53440; ON: DE84003909
• Country of Publication: United States
• Language: English

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ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHEMISTRY
CHLORINE COMPOUNDS
DATA
DISPERSIONS
DOCUMENT TYPES
ELEMENTS
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
GEOCHEMISTRY
HALIDES
HALOGEN COMPOUNDS
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
METALS
MIXTURES
NUMERICAL DATA
OXIDES
OXYCHLORIDES
OXYGEN COMPOUNDS
PERTECHNETATES
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
REVIEWS
SODIUM COMPOUNDS
SOLUTIONS
SULFIDES
SULFUR COMPOUNDS
TECHNETIUM
TECHNETIUM COMPOUNDS
TECHNETIUM FLUORIDES
TECHNETIUM HYDRIDES
TECHNETIUM OXIDES
TECHNETIUM SULFIDES
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS