Concentration of Soduim Octyl Suflate (mM) Electrokinetic Potential (mV) 1.000000e-02 -3.223194e+01 4.000000e-02 -3.287155e+01 1.000000e-01 -3.351115e+01 4.000000e-01 -3.504620e+01 1.000000e+00 -3.558632e+01 4.000000e+00 -3.958573e+01 1.000000e+01 -5.159214e+01 4.000000e+01 -6.104181e+01