How can you identify HCl from FTIR?
This page summarizes the recurring FTIR evidence reported for HCl, 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 23 cited sources
Quick answer
HCl 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
| Functional group | Evidence |
|---|---|
| Alkyl C-H | 22 |
| N h | 22 |
| Hydroxyl (O-H) | 18 |
| Methacrylate | 15 |
| Acetate | 15 |
| C-O single bond | 14 |
| Aromatic ring | 13 |
| Methoxy (OCH3) | 11 |
Spectrum logic
The logic here is evidence aggregation: repeated literature mentions of HCl, 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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confidence 3.6
HCl
The metastable HCl · 6H <sub>2</sub> O phase – IR spectroscopy, phase transitions and kinetic/thermodynamic properties in the range 170–205 K DOI: 10.5194/acp-13-11905-2013 -
confidence 3.6
HCl
Comparative study of the inhibitive action between the bitter orange leaf extract and its chemical constituent linalool on the mild steel corrosion in HCl solution DOI: 10.21577/0100-4042.20170020 -
confidence 3.6
HCl
Formulation of pH-responsive highly swellable hydrogel scaffolds for controlled release of tramadol HCl: characterization and biocompatibility evaluation DOI: 10.3389/fbioe.2023.1190322 -
confidence 3.6
HCl
Development, characterization and In-vitro evaluation of guar gum based new polymeric matrices for controlled delivery using metformin HCl as model drug DOI: 10.1371/journal.pone.0271623 -
confidence 3.6
HCl
Influence of Reduction with NaBH4 and HCl in Obtaining Amino Derivatives of Cashew Gum and Cytotoxic Profile DOI: 10.3390/polym15132856 -
confidence 3.6
HCl
Theoretical, chemical, and electrochemical studies of Equisetum arvense extract as an impactful inhibitor of steel corrosion in 2 M HCl electrolyte DOI: 10.1038/s41598-022-06215-6 -
confidence 3.6
HCl
H <sub>2</sub> O and HCl trace gas kinetics on crystalline HCl hydrates and amorphous HCl / H <sub>2</sub> O in the range 170 to 205 K: the HCl / H <sub>2</sub> O phase diagram revisited DOI: 10.5194/acp-14-5183-2014 -
confidence 3.6
HCl
Trends of HCl, ClONO <sub>2</sub> , and HF column abundances from ground-based FTIR measurements in Kiruna (Sweden) in comparison with KASIMA model calculations DOI: 10.5194/acp-11-4669-2011 -
confidence 3.6
HCl
Observed and simulated time evolution of HCl, ClONO <sub>2</sub> , and HF total column abundances DOI: 10.5194/acp-12-3527-2012 -
confidence 3.6
HCl
High-yield cellulose hydrolysis by HCl vapor: co-crystallization, deuterium accessibility and high-temperature thermal stability DOI: 10.1007/s10570-020-03002-2
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