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With respect to soluble elements, the analytical solution for an instantaneous planar source can be applied for the calculations of Da. On the other hand, low-solubility elements in the bentonite porewater may precipitate onto the surface of the bentonite when the tracer loaded with such elements was pipetted. The boundary condition in this case is presumed to be controlled by the solubility of the tracer. If the bentonite sample is assumed to be a semi-infinite medium, the analytical solution for a constant concentration of boundary condition is derived as follows.

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