How can you identify humic acids from FTIR?

Quick answer

humic acids 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

Spectrum logic

The logic here is evidence aggregation: repeated literature mentions of humic acids, 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

• 置信度 0.9

  humic acids

  Wang 等 - 2014 - Characteristics of Soil Humic Substances as Determ DOI: 10.1007/s10812-014-0014-7
• 置信度 0.9

  humic acids

  Interactions of Zn(II) Ions with Humic Acids Isolated from Various Type of Soils. Effect of pH, Zn Concentrations and Humic Acids Chemical Properties DOI: 10.1371/journal.pone.0153626
• 置信度 0.9

  humic acids

  Characteristics of Humic Acids in Drained Floodplain Soils in Temperate Climates: A Spectroscopic Study DOI: 10.3390/su151411417
• 置信度 0.9

  humic acids

  Spectroscopic characterization of humic and fulvic acids in soil aggregates, Brazil DOI: 10.1016/j.heliyon.2020.e04078
• 置信度 0.9

  humic acids

  Shaji 等 - 2022 - Humic acids from an Arctic fjord, Krossfjorden, Sp DOI: 10.24425/ppr.2022.143311
• 置信度 0.7

  humic acids

  Ch'ng 等 - 2011 - Qualitative Assessment of Soil Carbon in a Rehabil DOI: 10.1100/tsw.2011.54
• 置信度 0.7

  humic acids

  Nature differences of humic acids fractions induced by extracted sequence as explanatory factors for binding characteristics of heavy metals DOI: 10.1016/j.ecoenv.2018.02.013
• 置信度 0.7

  humic acids

  Velazquez-Vazquez 等 - 2022 - Estimation of hydrocarbon sequestration in soils DOI: 10.24275/rmiq/IA2660
• 置信度 0.7

  humic acids

  Wang 等 - 2019 - Influences of Nitrogen Application Levels on Prope DOI: 10.3390/su11195405
• 置信度 0.5

  humic acids

  The long term effect of Olive Mill Wastewater (OMW) on organic matter humification in a semi-arid soil DOI: 10.1016/j.heliyon.2020.e03181