Fig. 5 Typical electropherograms of a soil solution at buffer pH values of 8.13 (a), 9.03 (b), and 10.01 (c). Separation column, 720-mm by 50-µm i.d. fused capillary tube; support electrolyte chromate buffer 5 mmol L^-1 with 0.5 mmol L^-1 EOF modifier; applied voltage 20 kV, and 20°C. Peaks "x" and "y" were not identified during the analysis