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Updated: Jun 23, 2026
Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products
Published on: March 18, 2022
Structural organization of humic acid in the solid state.
Gabriela Chilom1, James A Rice
1South Dakota State University, Department of Chemistry and Biochemistry, Box 2202, Brookings, South Dakota 57007-0896, USA. gabriela.chilom@sdstate.edu
Humic acid
Area of Science:
- Soil Science
- Materials Science
Background:
- Humic acid's solution structure involves three distinct fractions.
- Previous studies focused on humic acid's self-organization in solution.
Purpose of the Study:
- To investigate humic acid's solid-state structural organization.
- To compare the solid state of humic acid with a physical mixture of its components.
Main Methods:
- Differential scanning calorimetry (DSC) was used.
- Specific heat capacity was measured as a function of temperature.
Main Results:
- Differences in specific heat capacity were observed between humic acid and its physical mixture.
- This indicates specific interactions, not just a mixture, define solid-state structure.
Conclusions:
- Humic acid exhibits a hierarchical "structure within a structure" in the solid state.
- A nanostructured composite forms from amphiphilic components and lipids.
- Non-amphiphilic components associate with this composite to form a higher-level structure.
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