Henry’s Law Constant Measurement for Hydrogen Peroxide Using Oxidative Decoloration of BPR
CHEN Zhong-ming,QU Xiao-cao
The State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences, Peking University, Beijing 100871, China
Abstract:The temperature-dependent Henry’s Law Constant for hydrogen peroxide was measured.The gas phase of hydrogen peroxide from the vapor saturator collected in a cryogenic trap was analyzed by a spectrophotometric determination, based on the oxidative decoloration of BPR (bromopryogallol red) reaction with hydrogen peroxide under the catalysis of hemin.At 10 ℃-35 ℃, the relationship between Henry’s Law constant KH (mol·L-1·atm-1) of hydrogen peroxide and temperature T (K) can be expressed as ln KH=a/T-b, where a=7 269±22, and b=13.26±0.08.The standard heat of hydrogen peroxide aqueous solution is 60.43±0.18 kJ·K-1·mol-1.
Key words:Henry’s law constant;Hydrogen peroxide;Atmosphere;Spectrophotometry
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