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Partition coefficient of Ra in gypsum

Authors :
T. Nakazawa
Takashi Nakanishi
Yasushi Yoshida
Hideki Yoshikawa
Source :
Journal of Radioanalytical and Nuclear Chemistry. 280:541-545
Publication Year :
2009
Publisher :
Springer Science and Business Media LLC, 2009.

Abstract

A partition coefficient (λ) for Ra in gypsum was determined from coprecipitation experiment using oversaturation method. The λ-value derived for Ra was: λRa = 0.32±0.15. Saturation state was estimated with the initial concentration of Ca and SO42− in an experiment of the present study. Saturation index was calculated to be (0.49±0.02). This value was similar to those corresponds to analogous case where slow precipitation rate was kept in coprecipitation experiment for Sr in gypsum. Therefore, derived λ-value is thought to describe partition of Ra and Ca in solid phase and solution under an equilibrium condition without the effect of kinetic of precipitation. Determined λ-value was compared with those of other alkaline elements in sulfate minerals. The derived λ-value is smaller than that of Ra in barite and is similar to those of Sr in gypsum. This trend agrees with mechanical understanding for the size effect against partition coefficient.

Details

ISSN :
15882780 and 02365731
Volume :
280
Database :
OpenAIRE
Journal :
Journal of Radioanalytical and Nuclear Chemistry
Accession number :
edsair.doi...........0db03c83ca48b74b302145b2027de39f
Full Text :
https://doi.org/10.1007/s10967-009-7470-1