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The suitability of different porous materials (stainless steel, VYCOR ®  glass, Al 2 O 3  and PEEK) for use as confining filters in diffusion experiments was evaluated by measuring the effective diffusion coefficients ( D  e ) of neutral (HTO) and ionic solutes (Na + , Cs + , Sr 2+ , Cl  –  , SeO 4  2− ) in the materials in through-diffusion experiments. For stainless steel filters, the  D  e  values of the target solutes correlated satisfactorily with their bulk diffusion coefficient in water ( D  w ); thus, the diffusion process in the stainless steel filters was primarily controlled by the diffusivity of the solvated ions. For the remaining materials, the  D  e  and  D  w  values were also correlated for the target solutes, and the geometric factors were in the sequence: VYCOR ®  glass &lt; Al 2 O 3  &lt; PEEK. Stainless steel and VYCOR ®  glass were the most appropriate materials because of their high  D  e  values, but a specific interaction of caesium with VYCOR ®  glass was hypothesised because the  D  e  values obtained for this solute were slightly higher than expected.

Suitability of various materials for porous filters in diffusion experiments