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Partition coefficients of Ra and Ba in calcite

Yoshida, Yasushi*; Yoshikawa, Hideki; Nakanishi, Takashi*

Partition coefficients ($$D$$) of Ra and Ba in calcite were derived in an experiment of coprecipitation. Free Drift Method (FDM) was adopted. As a result of experiment, $$D$$ of Ra and Ba were 9.4e-3 and 4.7e-3, respectively. A saturation state is expected to be a low oversaturation in duration of experiment and according to an estimated saturation index, a composition of a final solution was close to equilibrium with calcite. The values of $$D$$$$_{rm Ra}$$ and $$D$$$$_{rm Ba}$$ showed the similar extent. It implies that difference of size of ionic radius does not affect incorporation behavior of Ra and Ba in calcite.

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Category:Geochemistry & Geophysics

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