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Effect of the concentration of equimolar MES and HIS buffer (pH = 6.1) on the separation of the selected cations, at 100 μmol L−1 each. Other conditions: 3 mmol L−1 18-crown-6), ESEP = 10 kV, capillary length = 60 cm, effective length = 56 cm, 5 sec hydrodynamic injection.
