References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-14-7397-2014

Uptake of HO2 radicals onto Arizona test dust particles using an aerosol flow tube

Matthews

P. S. J.

¹ Baeza-Romero

M. T.

https://orcid.org/0000-0001-6891-4982

² Whalley

L. K.

¹ ³ Heard

D. E.

https://orcid.org/0000-0002-0357-6238

¹ ³

School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK

Escuela de Ingeniería Industrial de Toledo, Universidad de Castilla la Mancha, Avenida Carlos III s/n Real Fábrica de Armas, Toledo, 45071, Spain

National Centre for Atmospheric Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK

18 07 2014

14 14 7397 7408

2014

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://acp.copernicus.org/articles/14/7397/2014/acp-14-7397-2014.html

The full text article is available as a PDF file from https://acp.copernicus.org/articles/14/7397/2014/acp-14-7397-2014.pdf

Uptake coefficients for HO2 radicals onto Arizona test dust (ATD) aerosols were measured at room temperature and atmospheric pressure using an aerosol flow tube and the sensitive fluorescence assay by gas expansion (FAGE) technique, enabling HO2 concentrations in the range 3–10 × 108 molecule cm−3 to be investigated. The uptake coefficients were measured as 0.031 ± 0.008 and 0.018 ± 0.006 for the lower and higher HO2 concentrations, respectively, over a range of relative humidities (5–76%). A time dependence for the HO2 uptake onto the ATD aerosols was observed, with larger uptake coefficients observed at shorter reaction times. The combination of time and HO2 concentration dependencies suggest either the partial saturation of the dust surface or that a chemical component of the dust is partially consumed whilst the aerosols are exposed to HO2. A constrained box model is used to show that HO2 uptake to dust surfaces may be an important loss pathway of HO2 in the atmosphere.

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