Procedure for preparing infrared spectra on gas chromatographic fractions

A convenient technique is described for the preparation of microinfrared spectra on materials which elute from a gas chromatograph. The technique involves trapping the sample on KBr and then pressing this material in a die between two portions of pure KBr. Samples as small as 10 μg grams and as low boiling as 150 °C produce acceptable spectra. Since no solvents are employed, solvent band compensation is unnecessary.