Humic materials particle structure

The surfaces of sorbent materials, e.g., oxide particles in soil, are often less complex than the exterior of protein molecules. However, if such particles are (partly) covered with organic materials, e.g., humic acids and/or fulvic acids, their surface chemistry may be very complex as well. Also, surfaces of biological structures, such as those of plant roots, may be heterogeneous. 

The erosion resistance of soil can be improved by increasing the autohesion of the soil aggregates this may be done by treating the soil with binder materials. Substances that may be used for this purpose include cellulose and its derivatives (lignin, humic acid), asphalt or other bitumens, peat gum, and various structure-forming substances from plant residues. The adhesive material coats the soil particles. The layer that is formed, with a thickness of a few microns, makes the soil particles tacky and hence increases the interaction among the particles. 

---