How can you identify humic acid from FTIR?
This page summarizes the recurring FTIR evidence reported for humic acid, including the most frequent peaks, supporting functional groups, and literature-backed interpretation patterns. It is a structured evidence page, not a claim of automatic single-spectrum certainty.
Backed by 10 cited sources
Quick answer
humic acid is usually reported with a recurring pattern of peaks and functional-group evidence. The most useful approach is to cross-check at least two characteristic peaks before treating it as a match, then verify whether the full spectrum still fits the same material family.
Peak interpretation
Possible materials / groups
| 官能团 | 证据 |
|---|---|
| Alkyl C-H | 16 |
| Methacrylate | 15 |
| Acetate | 15 |
| Methoxy (OCH3) | 14 |
| Hydroxyl (O-H) | 14 |
| C-O single bond | 11 |
| Carboxyl (COOH) | 8 |
| Aromatic ring | 6 |
Spectrum logic
The logic here is evidence aggregation: repeated literature mentions of humic acid, repeated peak positions, and repeated functional-group associations. A strong material hypothesis should still be supported by multiple peaks that agree with each other, not by one headline band alone.
Real-world usage
This page is designed for polymer identification, incoming-material QC, unknown plastic analysis, recycled-content review, and literature-backed interpretation of reference spectra.
Common mistakes
- Calling a material match too early because one famous peak is present.
- Ignoring sample prep, fillers, oxidation, water, or additives that can change the apparent pattern.
- Using literature evidence without checking whether your own sampling mode and spectrum quality are comparable.
Verification advice
Use DSC, GC-MS, or TGA to validate the material hypothesis when the peak pattern is ambiguous or mixed.
Literature behind this page
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置信度 4.0
humic acid
Antimycotic nail polish based on humic acid‐coated silver nanoparticles for onychomycosis DOI: 10.1002/jctb.6676 -
置信度 4.0
humic acid
Hu 等 - 2021 - Properties of humus-like substances isolated from DOI: 10.1080/03650340.2020.1818072 -
置信度 4.0
humic acid
Terrestrial humic-like fluorescence peak of chromophoric dissolved organic matter as a new potential indicator tracing the antibiotics in typical polluted watershed DOI: 10.1016/j.jenvman.2018.09.013 -
置信度 4.0
humic acid
Co-Thermal Oxidation of Lignite and Rice Straw for Synthetization of Composite Humic Substances: Parametric Optimization via Response Surface Methodology DOI: 10.3390/ijerph192416875 -
置信度 4.0
humic acid
Humic Acid Improves Zn Fertilization in Oxisols Successively Cultivated with Maize–Brachiaria DOI: 10.3390/molecules26154588 -
置信度 4.0
humic acid
Extraction of humic acid from peat and lignite and the thermal behavior of their mixtures with ammonium nitrate DOI: 10.1007/s10973-023-12326-7 -
置信度 4.0
humic acid
Yang 等 - 2021 - Multi-spectroscopic Investigation on Mechanism of DOI: 10.6023/A21080408 -
置信度 2.5
humic acid
Saxena 和 Brighu - 2020 - Optimized coagulation of humic acid and mineral tu DOI: 10.2166/ws.2020.141 -
置信度 1.0
humic acid
Kinetics and Thermodynamics of Uranium (VI) Adsorption onto Humic Acid Derived from Leonardite DOI: 10.3390/ijerph16091552 -
humic acid
Polarity-Based Sequential Extraction as a Simple Tool to Reveal the Structural Complexity of Humic Acids DOI: 10.3390/agronomy11030587
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