This application note discusses the influence of sample ionic strength on surface zeta potential by studying the effect of various concentrations of a monovalent salt on two different surfaces: polycarbonate and PTFE. For PTFE the surface potential went from -60mV (at 0.1 mM KCl) to -20mV (at 30mM KCl). For the polycarbonate material the potential varied from -70mV (at 0.1 mM KCl) to -25mV (at 100mM KCl).

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