Measurement of the Hydraulic Permeability of Microporous Membranes from the Streaming Potential Decay

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Abstract
The standard methods used to measure the hydraulic permeability of microporous membranes are revised. It is proposed that the relaxation of the streaming potential be used once an initial pressure difference is established and the system is free to evolve. This method is compared with those that use pressure or height decay, and its simplicity and easy automatization is pointed out. The results are compared with those obtained by measuring the volume flow for several constant pressures (as suggested by the definition) for four different Nuclepore membranes and LiCl-water solutions (1 × 10−3 mol/L) at 298.0 ± 0.5 K. These results coincide within the error range.

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