How can you identify oil from FTIR?
This page summarizes the recurring FTIR evidence reported for oil, 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
oil 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
| Grup funcțional | Dovezi |
|---|---|
| Alkyl C-H | 16 |
| Carboxyl (COOH) | 4 |
| Methoxy (OCH3) | 4 |
| Methacrylate | 4 |
| C-O single bond | 4 |
| Acetate | 4 |
| Carbonyl (C=O) | 3 |
| Amide | 2 |
Spectrum logic
The logic here is evidence aggregation: repeated literature mentions of oil, 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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Dong 等 - 2020 - An indirect analytical approach based on ATR-FTIR DOI: 10.1039/d0ra03668d -
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Lojewski 等 - 2011 - Reflective and photoacoustic infrared spectroscopi DOI: 10.1007/s00339-011-6512-z -
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Wertz 等 - 2018 - Characterisation of oil and aluminium complex on r DOI: 10.1016/j.saa.2018.05.109) -
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Baird 和 Oja - 2022 - Multivariate models based on infrared spectra as a DOI: 10.3176/oil.2022.1.02 -
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Effect of heating on the oxidative stability of corn oil and soybean oil ; Efecto del calentamiento sobre la estabilidad oxidativa de aceites de maíz y de soja DOI: 10.3989/gya.0698181 -
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Faded shine…. The degradation of brass powder in two nineteenth century paintings DOI: 10.1186/s40494-015-0052-3 -
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Fourier transform midinfrared spectroscopy evaluation of early stages of virgin olive oil autoxidation DOI: 10.1002/ejlt.201200317 -
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Impact of microwave roasting on physicochemical properties, maillard reaction products, antioxidant activity and oxidative stability of nigella seed (Nigella sativa L.) oil DOI: 10.1016/j.foodchem.2021.130777 -
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Shalygin 等 - 2021 - Chemical Heterogeneity of Deposits Formed in the F DOI: 10.1134/S0965544121090127 -
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Fast and direct analysis of oxidation levels of oil-in-water emulsions using ATR-FTIR DOI: 10.1016/B0-08-043152-6/01622-3
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