Fig. 6 Relationship between the concentration of As species and peak area. 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 25 kV and 30°C for As(III) and DMA and 20 kV and 20°C for As(V). pH of electrolyte for the separation of As(III) and ;