Table I.

Measured and computed electrical potentials in some solutions

Values for ψ_{Wall, measured} were taken from the fitted curves in Figures 7 and 9 and from a curve fitted to the pooled data from Figure 8, A through C. Concentrations are in millimolar and potentials in millivolts.

LaCl3	pH	CaCl2	NaCl	ψWall, measured	ψWall, computeda	ψPM, computedb
0.001	5.6	0	0.1	−78.9	−72.0	−44.6
0.01	5.6	0	0.1	−55.7	−54.2	−25.4
0.1	5.6	0	0.1	−32.5	−35.5	−6.0
1	5.6	0	0.1	−9.3	−16.9	12.7
0	5.00	0	0.1	−87.4	−94.7	−71.0
0	4.00	0	0.1	−54.0	−59.1	−16.5
0	3.00	0	0.1	−9.4	−13.1	34.6
0	5.6	0.01	0.1	−88.6	−81.2	−85.1
0	5.6	0.1	0.1	−60.1	−56.6	−62.8
0	5.6	1	0.1	−31.6	−29.5	−36.1
0	5.6	0	0.1	−98.6	−110.6	−101.3
0	5.6	0	1	−57.5	−70.2	−85.5
0	5.6	0	10	−16.4	−22.5	−59.0

^a Parameter values for the Donnan-plus-binding model: R_Total = 0.0211 m and K_R,H = 9450.

^b ψ_{PM, computed} was computed by a Gouy-Chapman-Stern model (Kinraide et al., 1998) in which negative-site binding constants are K_R,Na = I, K_R,Ca = 30, K_R,La = 2,200, K_R,H = 21,500 m⁻¹.