Different methods of evaluating sharp-peaked compounds in FTIR spectra using benzene as an example

摘要

The quantification of benzene in FTIR spectra is restricted by the interference of benzene with carbon dioxide. In this paper different methods are presented to overcome these problems with a detector of medium resolution of 0.5 cm$+$MIN@1$/. The experiments were performed either in a 10 m gas cell or as open path experiments. One method compares the peak at 673.76 cm$+$MIN@1$/ with the strongest absorption band of benzene in the single beam spectrum to the neighboring peaks, one method analyzes the shape of the peak at 674 cm$+$MIN@1$/. Another method works with an artificial background and the latest methods analyze the absorbance spectrum and serve as a reference. The results from all these methods agreed very well down to the level of 30 to 50 ppb.