Fourier Transform Infrared (FTIR) spectroscopy for monitoring airborne gases and vapors of industrial hygiene concern.
Ying-S; Levine-SP; Strang-CR; Herget-WF
Am Ind Hyg Assoc J 1989 Jul; 50(7):354-359
To test the applicability of Fourier Transform Infrared (FTIR) spectroscopy to the qualitative and quantitative analysis of gas and vapor emissions in the workplace, a study was made to choose optimal conditions that could maximize the signal from individual target analytes and minimize the potential for interference. For this study, data were collected using a Nicolet 20 SXC FTIR spectrometer equipped with a Hanst 10 meter long path cell. All data were collected using 128 coadded interferograms. A total of 38 compounds was used in this study. The data system used was a Nicolet 620 equipped with 1 megabyte or random access memory and a 50 megabyte disc drive. A liquid nitrogen cooled, mercury/cadmium-telluride detector was used. The optimum wavelength region chosen for quantitation was established for each compound in air. Only potential interferences from CO, CO2 at about 300 parts per million, and water vapor at about 30 to 45 percent relative humidity were considered when selecting these wavelengths. FTIR proved to be useful to detect and quantitate individual gases and vapors in air at concentrations at or below their threshold limit values provided that the identities of the components were known, appropriate monitoring wavelengths were available, and the concentration of target analytes was within the range of the instrument.
NIOSH-Publication; NIOSH-Grant; Air-quality-monitoring; Air-sampling-equipment; Analytical-instruments; Analytical-methods; Chemical-analysis; Qualitative-analysis; Quantitative-analysis
Environmental & Indust Health School of Public Health II 1420 Washington Heights Ann Arbor, MI 48109-2029
American Industrial Hygiene Association Journal
University of Michigan at Ann Arbor, Ann Arbor, Michigan