Laboratory actinide partitioning - Whitlockite/liquid and influence of actinide concentration levels

Details Laboratory actinide partitioning - Whitlockite/liquid and influence of actinide concentration levels Laboratory actinide partitioning - Whitlockite/liquid and influence of actinide concentration levels

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.1695b&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 47, Oct. 1983, p. 1695-1705.

Mathematics

3

Actinide Series, Calcium Compounds, Mineralogy, Partitions (Mathematics), Trace Elements, Liquids, Meteoritic Composition, Plutonium, Radiography, Thorium, Uranium

Scientific paper

The partition coefficients between synthetic whitlockite (beta Ca-phosphate) and coexisting silicate melts are determined for the actinide elements Th, U and Pu. Experiments were performed at 1 bar pressure and 1250 C at oxygen fugacities from 10 to the -8.5 to 10 to the -0.7 bars, and partitioning was determined from trace element radiography combined with conventional electron microprobe analysis. Results show Pu to be more readily incorporated into crystalline phases than U or Th under reducing conditions, which is attributed to the observation that Pu exists primarily in the trivalent state, while U and Th are tetravalent. Corrected partition coefficients for whitlockite of 3.6, less than or equal to 0.6, 1.2, 0.5 and less than or equal to 0.002 are estimated for Pu(+3), Pu(+4), Th(+4), U(+4) and U(+6), respectively. Experiments performed at trace levels and percent levels of UO2 indicate that Si is involved in U substitution in whitlockite, and show a reduced partition coefficient at higher concentrations of U that can be explained by effects on melt structure or the fraction of tetravalent U.

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