Evaluation of Variance in Zeta Potential Measurements

Published

January 1, 1999

Author(s)

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

Abstract

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.

Citation

Journal of Membrane Science

Volume

161

Pub Type

Journals

Keywords

cellulose acetate membrane, streaming potential, zeta potential

Citation

Chapman-Wilbert, M. , Delagah, S. and Pellegrino, J. (1999), Evaluation of Variance in Zeta Potential Measurements, Journal of Membrane Science (Accessed October 15, 2025)