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

Journal Article · Tue Jan 01 00:00:00 EST 1985 · 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), Vol. 44
• Country of Publication: United States
• Language: English

Related Subjects

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