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Evaluation of Variance in Zeta Potential Measurements



M Chapman-Wilbert, S Delagah, J J. Pellegrino


We evaluated sources of varience in the measurement of the surface zeta potential of flat sheet specimens of cellulose di/triacetate membranes with a commercial electrokinetic analyzer. Two measurement methods were evaluated: the instrument's standard operating procedure which continuously ramps the flow past the specimen, and a modified-procedure that periodically stepped the slow rate and required manual calculation of zeta potential from the archived pressure and streaming potential data. Our study indicated that the kinetics of equilibration between electrolte, electrodes, and membrane has the greatest inpact on measurement uncertainty for any method used. An optimized protocol was developed for each method and the type A uncertainty (e.g. standard deviation) for the data collected using the optimized-modified-procedure was one third the value obtained using the optimized-standard procedure.
Journal of Membrane Science


cellulose acetate membrane, streaming potential, zeta potential


Chapman-Wilbert, M. , Delagah, S. and Pellegrino, J. (1999), Evaluation of Variance in Zeta Potential Measurements, Journal of Membrane Science (Accessed April 14, 2024)
Created January 1, 1999, Updated February 17, 2017