Fig. 7 Typical electropherograms of selected soil solutions following spiking of As(V) at 0.16, 2, and 5 mg L^-1. Capillary conditions were identical to those developed above. 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. pH of electrolyte separation of