Characterization of the humic acids extracted from different materials and study their complexes with montmorillonite

Some chemical, spectral and thermal characteristics of some humic acids (HA) extracted from: Farm manure (Fm), biogas(Bio), compost (Com), forest litters of pine (Pl) and of descendant forest (Dl), and their complexes with Camontmorillonite were studied by TGA and DTA analysis.