Measurement of H2O2 vapor (hydrogen peroxide) in the presence of water vapor.

A method of quantitative analysis of hydrogen peroxide in the vapor phase, wherein the vapor concentration of hydrogen peroxide is determined in the presence of water vapor in a sample containing both vapors of hydrogen peroxide and water, wherein based spectroscopy near infrared, and comprising method: a) the step of measuring the absorbance at approximately 1420 nm or the spectrum of the sample in a region including 1420 nm and b) the step of measuring the absorption capacity or the spectrum of the sample at other frequencies, or the step of measuring the spectra of a series of calibration samples in the region including 1420 nm that.