CHEMICAL ANALYSIS BY INFRARED SPECTROSCOPY

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1951

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Ohio State University

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The use of infrared spectroscopic measurements for purposes of chemical analysis continues to increase. New instrumentation has made earlier procedures easier to apply and has facilitated the development of new procedures. Recent papers have described detailed analysis of complicated liquid petroleum hydrocarbon mixtures, which would be virtually impossible by other analytical methods. Some new applications to the analysis of mixtures of hydrocarbon and other gases have been presented, including methods for circumventing difficulties from pressure broadening. Other recent examples of infrared analysis of multicomponent mixtures will be described. Infrared measurements have been used for determining the deuterium content of substances and this has been used in isotope-dilution chemical analysis for organic compounds. Additional use has been made of the fact that characteristic infrared absorption bonds can be attributed to certain chemical groups in a variety of molecules. Spectra of derivatives of long-chain compounds can be described in terms of trans-olefin, ester, alcohol, peroxide, and hydroperoxide groups. In the writer's laboratory a mechanical slit cam has been installed on a Beckman IR-2 spectrometer for giving absorption spectra in approximate percent transmission. Construction and operation of the apparatus will be described. Examples will be shown of the applicability of the double-beam feature of the Perkin-Elmer Model 21 spectrometer to the identification and analysis of gases in multicomponent gas mixtures.

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Author Institution: California Research Corporation

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