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Suitability of various materials for porous filters in diffusion experiments

Abstract The suitability of different porous materials (stainless steel, VYCOR® glass, Al2O3 and PEEK) for use as confining filters in diffusion experiments was evaluated by measuring the effective diffusion coefficients (De) of neutral (HTO) and ionic solutes (Na+, Cs+, Sr2+, Cl–, SeO42−) in the materials in through-diffusion experiments. For stainless steel filters, the De values of the target solutes correlated satisfactorily with their bulk diffusion coefficient in water (Dw); thus, the diffusion process in the stainless steel filters was primarily controlled by the diffusivity of the solvated ions. For the remaining materials, the De and Dw values were also correlated for the target solutes, and the geometric factors were in the sequence: VYCOR® glass < Al2O3 < PEEK. Stainless steel and VYCOR® glass were the most appropriate materials because of their high De values, but a specific interaction of caesium with VYCOR® glass was hypothesised because the De values obtained for this solute were slightly higher than expected.