Standard Practice for General Techniques for Obtaining Infrared Spectra for Qualitative Analysis
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Abbreviated as FT-IR, Fourier Transform Infrared Spectroscopy involves
striking a substance with progressive wavelengths of infrared light and
measuring absorption. Different types of molecular bonds absorb infrared light
at different wavelengths and as such, every material has its own 'fingerprint'.
Scientists can use that 'fingerprint' to identify and/or rule out the presence of a material.
Possible reasons why a company might request FT-IR Analysis include:
- Search for Residual, or Non-Reacted, Starting Material in a Final Product
Below you will find a brief description of the ASTM Test Method related to the topics covered above:
Significance and Use
Infrared spectroscopy is the most widely used technique for identifying organic and inorganic materials. This practice describes methods for the proper application of infrared spectroscopy.
1.1 This practice covers the spectral range from 4000 to 50 cm-1 and includes techniques that are useful for qualitative analysis of liquid-, solid-, and vapor-phase samples by infrared spectrometric techniques for which the amount of sample available for analysis is not a limiting factor. These techniques are often also useful for recording spectra at frequencies higher than 4000 cm–1, in the near-infrared region.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautions are given in 6.5.1.
2. Referenced Documents
- E131 Terminology Relating to Molecular Spectroscopy
- E1421 Practice for Describing and Measuring Performance of Fourier Transform Mid-Infrared (FT-MIR) Spectrometers: Level Zero and Level One Tests
- E1642 Practice for General Techniques of Gas Chromatography Infrared (GC/IR) Analysis
- E168 Practices for General Techniques of Infrared Quantitative Analysis
- E334 Practice for General Techniques of Infrared Microanalysis
- E573 Practices for Internal Reflection Spectroscopy
- E932 Practice for Describing and Measuring Performance of Dispersive Infrared Spectrometers
alkali halide pressed pellets; attenuated total reflection spectroscopy; diffuse reflection spectroscopy; disposable IR cards; DRIFT spectroscopy; emission spectroscopy; gas chromatographic effluent spectra; gas phase spectra; heated gas cells; infrared solution spectra; infrared spectroscopy; latex suspensions; liquid phase spectra; photoacoustic spectroscopy; polymer analysis; qualitative infrared analysis; solid phase spectra; split mull technique; vapor phase spectra ; ICS Number Code 71.040.50 (Physicochemical methods of analysis)
( Download ASTM E1252 From www.ASTM.org )