Explain the principle, instrumentation and environmental applications of IR Spectrometry and Mass Spectrometry
Infrared (IR) spectrometry and mass spectrometry are two widely used analytical techniques in environmental chemistry for identifying and characterizing substances in complex environmental samples. Both methods provide valuable insights into the composition, structure, and behavior of chemical compounds in the environment, offering critical information for pollution monitoring, waste management, and environmental impact assessments.
### IR Spectrometry
Principle
Infrared spectrometry (IR) is based on the interaction of infrared radiation with matter, specifically the absorption of infrared light by molecules. The primary principle of IR spectrometry is that different chemical bonds within a molecule absorb infrared light at characteristic wavelengths corresponding to the vibrational frequencies of these bonds. When a sample is exposed to infrared radiation, the bonds in the molecules either stretch or bend, absorbing energy at specific frequencies. The energy absorbed is directly related to the type of bond and the mass of the atoms involved.
In an IR spectrum, the x-axis represents the wavelength (or wavenumber) of the absorbed radiation, and the y-axis represents the intensity of the absorbed energy. The resulting spectrum is a unique "fingerprint" of the molecule, allowing for qualitative and quantitative analysis.
Instrumentation
The main components of an IR spectrometer include the following:
1. Light Source: A stable, continuous infrared light source is required. Common sources include tungsten lamps or heated black-body sources that emit radiation in the mid-IR range (typically 4000 to 400 cm-1).
2. Monochromator or Interferometer: The monochromator or interferometer disperses the infrared light into its component wavelengths. In the case of a Fourier Transform Infrared (FTIR) spectrometer, an interferometer is used to modulate the infrared light.
3. Sample Holder: Samples are typically placed in a sample holder. In gas phase measurements, gases are often analyzed in a sample cell, while liquids and solids may be analyzed using thin films, pellets, or transparent windows such as potassium bromide (KBr) for solid samples.
4. Detector: After passing through the sample, the remaining infrared light is detected by
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