FTIR (Fourier Transform Infrared Spectroscopy) is a rapid and often non-destructive analytical technique that can provide a great deal of information without the sample needing to be dissolved or destroyed. It is therefore often one of the first techniques used in a problem-solving process.
The technique provides a kind of fingerprint of the material, particularly for organic compounds. The spectrum can be used to identify known substances, but also to determine what type of substance is present, such as a hydrocarbon, alcohol, ester or ether.
FTIR can be used on liquids, solids and surfaces and is therefore particularly useful for:
- identifying unknown materials and contaminants
- comparing materials and performing quality control
- monitoring chemical reactions and processes
- studying the curing of coatings, polymers and similar materials
- monitoring degradation or changes in plastics and other materials.
FTIR is based on the absorption of infrared (IR) radiation and is best suited to applications where the substance of interest is present at a concentration of approximately 0.1% or higher. Water absorbs infrared radiation, so for samples in water we can complement our analysis with Raman spectroscopy.