What is humic acids?
Humic acid is a mixture of natural organic macromolecular compounds. Widely found in nature, the proportion of humic acid in soil is the largest. Soil humic acid is a physicochemical heterogeneous complex. The molecular weight of the mixture is polydisperse. The mixture is natural, high molecular weight, yellow to black, amorphous. It is composed of a colloidal, fatty and aromatic organic polyelectrolyte and cannot be represented by a single chemical structural formula.