Chemical and physicochemical characteristics of humic acids (AH) extracted from composted urban wastes are important to know their behavior in the environment. AH are the main component of the organic matter (OM) and they influence the biological and physico-chemical properties of toxic metal ions and other organic compounds (e.g, herbicides and pesticides) in soil and water. Basic parameters like elemental analysis, functional groups, IR spectrum, charges development were obtained. Capillary zone electrophoresis (CZE) in DL-Alanine background electrolyte (BGE) were used to complete their characterization. HA extracted from compost have some characteristics similar to those obtained from soil and another similar to soil FA. The former have differences in the nitrogen content, in acidic functional groups, specially phenolic hydroxyls, in their aromaticity and in surface charge development The electrophoretics patterns of HA extracted from compost show some similarities with those extracted from soil indicating similar composition, however its humification process are different and limited.
