Table 3.

Zeta potential of the membrane skin layer.

Membrane Abbreviation		Zeta Potential, mV
	pH = 3.2	pH = 4.0	pH = 4.6	pH = 7.0	pH = 9.5
A25	8	0	−28	−58	−65
A-0.3-25	28	0	−18	−88	−95