Fourier Transform Infrared Spectroscopy (FTIR)
FTIR is a powerful analytical technique used to identify organic, polymeric, and in some cases,
inorganic materials. It works by measuring the absorption or transmission of infrared light by a
sample.
How it Works:
1. Infrared Light Source: Infrared light is directed towards the sample.
2. Sample Interaction: The sample absorbs specific frequencies of infrared light, causing
molecular vibrations.
3. Detector: A detector measures the intensity of the transmitted or reflected light at various
frequencies.
4. Fourier Transform: The raw data is mathematically transformed to produce an infrared
spectrum.
The Infrared Spectrum:
The infrared spectrum is a plot of the intensity of the transmitted or reflected light versus the
frequency or wavelength of the infrared radiation. The peaks in the spectrum correspond to the
specific vibrational modes of the molecules in the sample. By analyzing the positions and shapes of
these peaks, chemists can identify functional groups and determine the molecular structure of the
sample.
Applications of FTIR:
Quality Control: Monitoring the quality of raw materials and finished products.
Material Identification: Identifying unknown materials or contaminants.
Polymer Analysis: Characterizing the structure and properties of polymers.
Pharmaceutical Analysis: Analyzing drug formulations and impurities.
Food Analysis: Detecting adulteration and contaminants in food products.
Forensic Science: Identifying substances found at crime scenes.
Advantages of FTIR:
Rapid Analysis: Quick and efficient analysis.
High Sensitivity: Can detect small amounts of substances.
Non-Destructive: Does not damage the sample.
Versatility: Can analyze a wide range of materials.
FTIR is a valuable tool for chemists and researchers in various fields. It provides valuable information
about the molecular structure and composition of materials, making it an essential technique for
quality control, research, and development.
