humic substances

https://doi.org/10.1351/goldbook.14746
Nonvolatile organic anionic polyelectrolytes, of biological origin, in the molecular mass range \(\pu{500\!{-}\! 5000}\), which have complex structures and are variable in composition.
Note: Humic substances occur naturally as deposits on sediment and soil particles and constitute \(\pu{30\!{-}\! 50 \%}\) of the dissolved organic carbon (DOC) in natural waters. Humic substances are classified according to solubility and may contain humic acid, fulvic acid, and humin.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 897 [Terms] [Paper]
Citation: 'humic substances' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.14746 RIS BibTex EndNote
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