Solubility data for U(VI) hydroxide and Np(IV) hydrous oxide: application of MCC-3 methodology

Journal Article · Mon Dec 31 23:00:00 EST 1984 · Mater. Res. Soc. Symp. Proc.; (United States)

OSTI ID:6303592

Krupka, K M; Rai, D; Fulton, R W; Strickert, R G

Experiments based on a modified MCC-3S test method were conducted to investigate the solubility of U(VI) hydroxide (the mineral schoepite) and Np(IV) hydrous oxide at ambient temperature. The solubility of U(VI) hydroxide was investigated in carbonate-free, oxidizing aqueous solutions in the pH range of 3 to 11. The measured concentrations of dissolved U confirm the amphoteric behavior of U(VI) hydroxide solid and the importance of anionic U(VI) solids under basic pH conditions. The effect of fluoride complexation on the solubility of Np(IV) hydrous oxide was studied in carbonate-free, near-neutral to alkaline solutions that contained 100 ppm total F. For solutions in which sodium dithionite (Na2S2O4) and metallic Fe were used as reducing agents, the addition of 100 ppm F had no measurable effect on the solubility of Np(IV) hydrous oxide. 20 references, 1 figure.

• Research Organization: Pacific Northwest Lab., Richland, WA
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6303592
• Journal Information: Mater. Res. Soc. Symp. Proc.; (United States), Journal Name: Mater. Res. Soc. Symp. Proc.; (United States) Vol. 44; ISSN MRSPD
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTINIDE COMPOUNDS
AMBIENT TEMPERATURE
AQUEOUS SOLUTIONS
CHALCOGENIDES
COMPLEXES
DATA
DISPERSIONS
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
MIXTURES
NEPTUNIUM COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PH VALUE
SOLUBILITY
SOLUTIONS
TRANSURANIUM COMPOUNDS
URANIUM COMPOUNDS
URANIUM HYDROXIDES
VALENCE