Humic acids

Humic acids ^[1] - a class of high molecular weight organic nitrogen-containing hydroxy acids with a benzoic nucleus, which are part of the humus and formed in the process of humification .

Humic acid groups:

• Humic acids (HA) - a group of dark-colored humic acids, soluble in alkalis and insoluble in acids.
• HIMA is a group of humic acids soluble in ethanol.
• Fulvic acids (FC) - a group of humic acids soluble in water, alkalis and acids.