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首页> 外文期刊>Journal of Radioanalytical and Nuclear Chemistry: An International Journal Dealing with All Aspects and Applications of Nuclear Chemistry >Partition coefficient of Ra in witherite
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Partition coefficient of Ra in witherite

机译：Ra在钙镁矿中的分配系数

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The heterogeneous partition coefficient (lambda) for Ra in BaCO3 (witherite) was determined by coprecipitation using the free drift method. Initially, CO2 (100 %) was bubbled through a solution equilibrated with witherite. After a small amount of Ra was added into the solution, coprecipitation was induced by a slow increase in pH, caused by degassing CO2(g) from the solution. Kinetically controlled precipitation was restricted to be slow because of the slow degassing of CO2(g). The observed low precipitation rate allowed for the equilibrium partitioning of elements during coprecipitation of witherite. The value of lambda derived for Ra was (1.3 +/- A 0.7) x 10(-1), a value similar to that obtained from the coprecipitation of Ra in CaCO3 (calcite). The obtained results indicated that partitioning of Ra in carbonate-based minerals was not dependent on the similarity of its ionic radius with that of the metal in the host carbonate.
机译：使用自由漂移法通过共沉淀法确定BaCO3（镁铝矿）中Ra的非均质分配系数（λ）。最初，将CO2（100％）鼓泡通过以钙镁石平衡的溶液。向溶液中加入少量Ra后，由于溶液中的CO2（g）脱气，导致pH值缓慢升高而引起共沉淀。由于CO2（g）的缓慢脱气，动力学控制的降水被限制为缓慢。观察到的低沉淀速率允许在钙铁矿的共沉淀过程中元素的平衡分配。 Ra得出的Lambda值为（1.3 +/- A 0.7）x 10（-1），该值类似于从Ra在CaCO3（方解石）中的共沉淀获得的值。所得结果表明，Ra在碳酸盐基矿物中的分配并不取决于其离子半径与基质碳酸盐中金属离子半径的相似性。

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