Humus is a dark-brown, amorphous, polydispersed organic substance with a high molecular weight that is hard degraded. It is formed from the physical, chemical, and microbial decomposition and transformation of animal and plant remains. Therefore, it exists in large quantities in soil, peat, lignite, water and sediment. The main active ingredients in humus are humic acid and fulvic acid, and contain a small amount of humin. Since humic acid is soluble in alkali but not in acid, fulvic acid is soluble in acid and alkali, and humus is insoluble in acid and alkali, and HM is insoluble in acid and alkali. , so they can be separated and purified to a certain extent through solubility. Humic acid is a macromolecular organic acid composed of aromatic and various reactive functional groups. It has high reactivity and is widely used in agriculture, medicine and Environmental protection and other fields.
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