Contribution of capillary electrophoresis to an integrated vision of humic substances size and charge characterizations

► Humic substances (HS) are characterized in terms of RH, size, and charge in CZE. ► HS are of nanometric dimension whatever the ionic strength and alkaline counter-ion. ► Electrophoretic mobilities are related to electrolyte composition. ► Weak HS-alkali metal interactions affect HS electrophoretic transport.