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Compliance Testing, Inc. Now Offers FTIR"
Monday, January 29, 2007 at 13:40:20
– January 29, 2007 -- Commonly referred
to as FTIR, Fourier Transform Infrared Spectroscopy is the most
recent addition to the Air Compliance Testing technological
FTIR can be used to identify chemicals from paints, polymers,
coatings, spills, drugs, and contaminants (qualitative analysis).
FTIR is likely the most powerful tool for identifying types
of chemical bonds (functional groups). The wavelength of light
absorbed is characteristic of the chemical bond as can be seen
in this annotated spectrum. Because the strength of the absorption
is proportional to the concentration, FTIR can also be used
for some quantitative analyses.
FTIR Applications include:
- EPA Method 318: Extractive FTIR Method for the Measurement
of Emissions from the Mineral Wool and Wool Fiberglass Industries
- EPA Method 320: Measurement of Vapor Phase Organic and Inorganic
Emissions by Extractive Fourier Transform Infrared (FTIR) Spectroscopy
- EPA Method 321: Measurement of Gaseous Hydrogen Chloride Emissions
At Portland Cement Kilns by Fourier Transform Infrared (FTIR)
- Identifying gas stream organic compounds and many inorganic
- Chemical process monitoring and optimization
- On-line process monitoring
- Measuring moisture in corrosive gases
- Reaction end point determinations
- Measuring catalyst efficiency
- Control equipment optimization
- Real time speciated VOC emission analysis
- Indoor air monitoring of VOC`s and semi-volatiles at very
- Blending processes optimization
By now you re probably wondering how FTIR works: Because chemical
bonds absorb infrared energy at specific frequencies (or wavelengths),
the basic structure of compounds can be determined by the spectral
locations of their IR absorptions. The plot of a compound`s
IR transmission vs. frequency is its `fingerprint` that can
be compared to reference spectra to identify the material. FTIR
spectrometers offer speed and sensitivity impossible to achieve
with older wavelength-dispersive instruments. This capability
allows rapid analysis of micro-samples down to the nanogram
level is some cases, making the FTIR unmatched as a problem-solving
tool in organic analysis.
Fourier transform infrared spectroscopy is preferred over dispersive
or filter methods of infrared spectral analysis for several
- It is non-destructive
- Solids, liquids and gases can all be sampled.
- It provides a precise measurement without external calibration
- It is fast. Most measurements by FTIR are made in a matter
of seconds rather than several minutes.
- It is mechanical simple. The mirror in the interferometer
is the only continuously moving part in the instrument.
- Sensitivity is dramatically improved with TIR. The detectors
employed are more sensitive and the optical throughput is higher.
This results in lower noise levels, and the fast scans enable
the coaddition of several scans in order to reduce the random
measurement noise to any desired level.
- The instruments are self-calibrating.
Contact us at 1-800 EPA-AIR1 (800-372-2471) to see how we can
apply this incredible diagnostic tool to your process improvement
Web Address: www.aircomp.com
Contact: Phil Billick
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