Determining the concentration of gaseous hydrogen peroxide

摘要

On line and essentially continuous measurements of hydrogen peroxide vapor in the presence of water vapor can be made using near infrared (NIR) spectroscopy using fiber optic cables to transmit infrared radiation between, e.g, a sterilization chamber and the NIR instrument. Hydrogen peroxide absorbs selectively at about 1420 nm, where water vapor also absorbs, but the absorbance at 1420 nm can be corrected for water vapor measurements at remote wavelengths where H2O2 is transparent. The measurement process may be conveniently made by applying a multivariant statistical technique to the spectrum obtained over one or more bands within the 900-2000 nm region using the correlation obtained for a calibration set for which analogous measurements are made over the same region.