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The interaction of H(2)O(2) with ice surfaces between 203 and 233 K
N Pouvesle1, M Kippenberger, G Schuster
1Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, Postfach 3060, 55020 Mainz, Germany.
Physical Chemistry Chemical Physics : PCCP
|October 27, 2010
Summary
Hydrogen peroxide (H2O2) strongly adsorbs onto ice surfaces at low temperatures. This finding suggests H2O2 may significantly partition to ice in cirrus clouds, impacting atmospheric chemistry.
Area of Science:
- Atmospheric Chemistry
- Surface Science
- Physical Chemistry
Background:
- Hydrogen peroxide (H2O2) is a key atmospheric trace gas.
- Understanding H2O2 interactions with ice is crucial for atmospheric modeling, particularly in cold environments like cirrus clouds.
Purpose of the Study:
- To quantify the adsorption of H2O2 onto ice surfaces.
- To determine the partition coefficient of H2O2 between the gas phase and ice.
- To investigate the implications for H2O2 presence in cirrus clouds.
Main Methods:
- Utilized a low-pressure, coated-wall flow tube reactor.
- Employed chemical ionization/electron impact mass spectrometry for detection.
- Measured equilibrium surface coverages to derive adsorption isotherms.
Main Results:
- Derived Langmuir-type adsorption isotherms for H2O2 on ice between 203-233 K.
- Determined a partition coefficient, K(linC) = 2.1 × 10⁻⁵ exp(3800/T) cm.
- Observed significantly higher H2O2 partitioning to ice than previously reported, especially at 228 K.
Conclusions:
- H2O2 is strongly partitioned to ice surfaces at low temperatures.
- This partitioning is significant in cirrus clouds, potentially influencing their chemical composition.
- Established a correlation between H2O2 partitioning and thermodynamic properties, enabling parameterization for similar trace gases.
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