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Report No.

Partition coefficient of Ra in witherite

Yoshida, Yasushi*; Nakazawa, Toshiyuki*; Yoshikawa, Hideki

A heterogeneous partition coefficient for Ra in BaCO$$_{3}$$ (witherite) was determined from a coprecipitation experiment using the free drift method. The initial solution was bubbled with 100% CO$$_{2}$$(g) and equilibrated with witherite. After a small amount of Ra was added into the solution, a coprecipioitation reaction was induced by increase of pH caused by degassing of CO$$_{2}$$ (g). A kinetic reaction of precipitation was restricted to be slow due to slow degassing of CO$$_{2}$$(g). Precipitation rate was observed to be enough low comparing with values of low precipitation rates to derive equilibirium partitioning of elements in coprecipitation experiments with CaCO$$_{3}$$ (calcite). The $$lambda$$-value derived for Ra was $$lambda$$ = (1.3$$pm$$0.7)$$times$$10$$^{-1}$$. This value was similar to that of Ra in CaCO$$_{3}$$ (calcite). It indicated that partitioning behavior of Ra in carbonate minerals did not depend on affinity in radius of a cation in host carbonate.



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Category:Chemistry, Analytical



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