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

摘要

Abstract: 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. !4