Nitrate — FTIR absorption peaks and assignments

Quick answer

Nitrate is usually assigned by looking for a recurring cluster of characteristic peaks rather than one exact textbook number. The table below shows where the literature most often places this group in FTIR, ranked by accumulated evidence.

Characteristic FTIR peaks for Nitrate

Showing the 30 best-supported peaks of 97 total for Nitrate.

Spectrum logic

A functional-group assignment becomes more confident when several expected bands appear together. Use this page to find the strongest-supported peaks, then confirm that the same sample exhibits a coherent pattern rather than a single isolated hit.

Real-world usage

These pages are useful for unknown material analysis, peak explanation in reports, polymer troubleshooting, and verifying whether a candidate material family is chemically plausible.

Common mistakes

• Using one functional-group page as a complete material verdict without checking the rest of the spectrum.
• Assuming the strongest band is always the most diagnostic one.
• Forgetting that processing, additives, aging, and mixtures can shift or broaden expected peaks.

Verification advice

Use DSC, GC-MS, or TGA when several material families share similar bands or when mixture effects make the FTIR assignment uncertain.

Literature behind these assignments

• 1302 cm⁻¹ confidence 1.0

  “cm-1 cm-1, characteristic peaks at 1302 and 1416 which correspond to vibrational modes 3-) (COO-) of nitrate (NO and acetate ions [50,51].”

  Sol-Gel Synthesized High Entropy Metal Oxides as High-Performance Catalysts for Electrochemical Water Oxidation DOI: 10.3390/molecules27185951
• 728 cm⁻¹ confidence 1.0

  “The absorption bands 1413 cm-1 3-, cm-1 cm-1 at 815.25 and 728.12 were assigned to the N-O bending vibration of NO and to C-N at 815.25 cm-1 and 728.12 cm-1 were assigned to the N-O bending vibration of NO3-, and to C-N stretching from the”

  Effect of Ratio in Ammonium Nitrate on the Structural, Microstructural, Magnetic, and AC Conductivity Properties of BaFe12O19 DOI: 10.3390/ma11112190
• 3460 cm⁻¹ confidence 1.0

  “Moreover, the interleaved may be observed at 1653 cm-1 cm-1 water molecules, bands exist at 3460 and 1631 process can be confirmed by vanishing the nitrate peak”

  Bohari 等 - 2022 - Synthesis and Characterization of 2,4-Dichlorophen DOI: 10.22146/ijc.73546
• 2025 cm⁻¹ confidence 1.0

  “3 cm-1 The The absorption band with a maximum at 2025 absence of crystalline vanadia and ZrV and a 2O solid solution, as 7 cm-1 at approximately 1965 is attributed to the nitrate by the XRD measurements, indicates highly isolated state shou”

  Low-temperature selective catalytic reduction of NO with NH3 over V/ZrO2 prepared by flame-assisted spray pyrolysis: Structural and catalytic properties DOI: 10.1016/j.apcatb.2012.08.012
• 660 cm⁻¹ confidence 1.0

  “The main absorption peaks cm-1 of CaSO around 660 and 600 provided no 4 interferences to nitrate bands (Verma and Deb 2007).”

  Choe 等 - 2010 - An Alternate Method for Fourier Transform Infrared DOI: 10.1007/s11270-009-0091-z
• 1384 cm⁻¹ confidence 1.0

  “In both cases, peaks around cm-1 1384 were observed, which is characteristic of N O and N O stretching of NO 3.”

  Antimycotic nail polish based on humic acid‐coated silver nanoparticles for onychomycosis DOI: 10.1002/jctb.6676
• 1435 cm⁻¹ confidence 1.0

  “The peak at 1435 is assigned due a value of 2 and 1/2 for direct allowed and indirect allowed transi2O and the broad to the residual nitrate and organic matter in Y (˛E)2 3 respectively.”

  Jayaramaiah 等 - 2011 - Thermoluminescence studies of solution combustion DOI: 10.1016/j.matchemphys.2011.06.025
• 1435 cm⁻¹ confidence 1.0

  “The characteristic cm-1 peak observed at 875 is attributed to stretching frequency of Y-O, the peak at 1435 cm-1 3:Eu3+ is assigned due to the residual nitrate and organic matter in Y 2O and the peak cm-1 is corresponding to the stretching”

  Jayaramaiah 等 - 2015 - Luminescence performance of europium-doped yttrium DOI: 10.1016/j.jlumin.2014.08.003