RESULT PAGE
Calcium carbonate
View the report above. Use the comments below if you need follow-up discussion.
FTIR Analysis Report
High confidence
Calcium carbonate
Material direction: Calcium carbonate (calcite)
Sample & Measurement Parameters
Report No.
20260609164129062101177
Date
2026-06-09 09:03:22
Spectral Range (cm⁻¹)
[(400, 4000)]
Baseline
AsLS baseline correction
Library match
84%
Identification Result
84%The sample is identified as calcium carbonate (calcite), consistent with library match and characteristic carbonate bands at 712, 876, and 1415 cm⁻¹ corresponding to ν₄, ν₂, and ν₃ vibrations, respectively
Detailed interpretation
- Top library match: Calcium carbonate #125439
- The user‑supplied context ('Chitosan powder extracted from oyster shell') names a different material, but the spectrum lacks typical chitosan bands such as amide I near 1650 cm⁻¹ and polysaccharide C–O–C around 1150 cm⁻¹.
- The spectral pattern is dominated by carbonate, suggesting residual oyster shell or incomplete demineralisation rather than purified chitosan.
- Minor dolomite or ankerite substitution (Mg/Fe) cannot be fully excluded given the presence of these carbonates in the Top‑15 list, but the primary identification as calcite is most consistent with the evidence.
Library Comparison
Library spectrum will appear here.
Library Search Results — Top 15 Candidates
| Rank | Match % | Compound | SMILES | Spectrum No. | Action |
|---|---|---|---|---|---|
| Loading library candidates... | |||||
Peak Analysis
★ = Literature-supported assignment| # | Wavenumber (cm⁻¹) | Absorbance | Assignment | Citation | Assignment status | |
|---|---|---|---|---|---|---|
| 1 | · | 1506 | 0.54 | - | - | - |
| 2 | · | 1415 | 0.50 | - | - | - |
| 3 | · | 422 | 0.39 | - | - | - |
| 4 | · | 876 | 0.38 | - | - | - |
| 5 | · | 1497 | 0.22 | - | - | - |
| 6 | · | 467 | 0.22 | - | - | - |
| 7 | · | 712 | 0.20 | - | - | - |
| 8 | · | 2360 | 0.17 | - | - | - |
| 9 | · | 455 | 0.16 | - | - | - |
| 10 | · | 481 | 0.16 | - | - | - |
| 11 | · | 1519 | 0.13 | - | - | - |
| 12 | · | 1734 | 0.12 | - | - | - |
| 13 | · | 502 | 0.11 | - | - | - |
| 14 | · | 521 | 0.09 | - | - | - |
| 15 | · | 1647 | 0.07 | - | - | - |
| 16 | · | 553 | 0.05 | - | - | - |
| 17 | · | 1717 | 0.05 | - | - | - |
| 18 | · | 3566 | 0.04 | - | - | - |
| 19 | · | 3735 | 0.04 | - | - | - |
| 20 | · | 3649 | 0.03 | - | - | - |
Appendix — Raw Spectrum
Discussion
Comments and follow-up evidence
Use this area to continue the interpretation, ask questions, or add extra verification evidence.