References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-10-7127-2010

Heterogeneous uptake of gaseous hydrogen peroxide by Gobi and Saharan dust aerosols: a potential missing sink for H2O2 in the troposphere

Pradhan

¹ Kyriakou

¹ Archibald

A. T.

¹ ² Papageorgiou

A. C.

¹ Kalberer

¹ Lambert

R. M.

Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK

NCAS Climate, Centre for Atmospheric Science, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK

03 08 2010

10 15 7127 7136

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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The first direct laboratory measurements of gaseous hydrogen peroxide uptake by authentic Gobi and Saharan dust aerosol particles as a function of relative humidity (RH) have been carried out in an entrained aerosol flow tube coupled to a chemical ionization mass spectrometer. Gobi dust shows uptake coefficients, γH2 O2 = (3.33±0.26) ×10−4 at 15% RH rising to γH2 O2 = (6.03±0.42) ×10−4 at 70% RH; the corresponding values for Saharan dust are systematically higher (γH2 O2 = (6.20±0.22)×10−4 at 15% RH rising to γH2 O2 = (9.42±0.41) ×10−4 at 70% RH). High resolution X-ray photoelectron spectroscopy (XPS) measurements of the surface chemical composition of the two mineral dust samples together with published water adsorption isotherms of their principal constituents enables rationalization of these observations, which are relevant to nighttime tropospheric chemistry. A box model study performed by incorporating the experimentally determined data set reveals that uptake of H2O2 onto dust can be an important loss process for this species which has been, until now, poorly constrained.

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