Difference Between Humic Acid and Fulvic Acid
Humic acid and fulvic acid are the two main components of soil humus. They have some significant differences in chemical properties, sources, structures and functions. Here are their main differences: 1. Source and composition Humic Acid: Source: Humic acid mainly comes from the decomposition and decay process of soil organic matter (such as animal and plant residues). Composition: Humic acid is a complex macromolecule composed of a variety of organic compounds, including aromatic and fatty structures, as well as a large number of functional groups such as carboxyl, hydroxyl, phenol groups, etc. Fulvic Acid: Source: Similar to humic acid, fulvic acid is also a product of the decomposition of soil organic matter, but compared to humic acid, fulvic acid is a product with a higher degree of decomposition. Composition: Fulvic acid has a smaller molecular weight, simpler structure, contains more functional groups such as carboxyl and hydroxyl groups, and has stronger solubility and mobility than humic acid. 2. Solubility Humic acid: Limitedly soluble in water, but soluble under alkaline conditions (such as sodium hydroxide solution). Fulvic acid: has good solubility in water, weak acid and alkaline solutions. 3. Molecular weight and structure Humic acid: higher molecular weight, complex structure, more...
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