Humic substances in the lab are resistant to further biodegradation. Their structure, elemental composition and content of functional groups of a given sample depend on the water or soil source and the specific procedures and conditions of extraction. Nevertheless, the average properties of lab extractes HS from different sources are remarkably similar.

Fractionation

Historically, scientists have used variations of similar methods for extracting HS from NOM and separating the extracts into HA and FA. The International Humic Substances Society

1.Previous
3.Next