Henry's law constants for aqueous solutions of hydrogen peroxide and hydroxymethyl hydroperoxide

Abstract

The Henry's law constants for aqueous solutions of hydrogen peroxide (H2O2) and hydroxymethyl hydroperoxide (HMHP) were measured for temperatures from 278 to 293 K at a pH of 2.1 to 2.4. A lower limit for the Henry's law constant of bis(hydroxymethyl)peroxide was obtained. At 288 K the Henry's law constant was determined for pH values from 2.2 to 6.4. The gas‐phase peroxides were generated by passing humidified zero air through a porous tube immersed in a thermostated hydroperoxide solution. The temperature dependence of the Henry's law constant can be expressed as HL[M atm−1]=exp(A/T[K]−B). The values of A are 7,514 ± 519 for H2O2 and 10,240 ± 913 for HMHP, and the values of B are 13.63 ± 0.11 for H2O2 and 20.03 ± 0.20 for HMHP. The dependence of the Henry's law constants as a function of pH was studied.