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Issue 5, 2007
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Heterogeneous conversion of calcite aerosol by nitric acid

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The reaction of nitric acid with calcite aerosol at varying relative humidities has been studied under suspended particle conditions in an atmospheric reaction chamber using infrared absorption spectroscopy. The reactant concentration in the chamber, as well as the appearance of gas phase products and surface adsorbed species, was spectroscopically monitored before and after mixing with CaCO3 (calcite) particles. The interaction with HNO3 was found to lead to gas phase CO2 evolution and increased water uptake due to heterogeneous conversion of the carbonate to particulate nitrate. The reaction was enhanced as the relative humidity of the system was increased, especially at relative humidities above the reported deliquescence point of particulate Ca(NO3)2. The measured reaction extent demonstrates that the total calcite particulate mass is available for reaction with HNO3 and the conversion process is not limited to the particle surface. The spectroscopy of the surface formed nitrate suggests a highly concentrated solution environment with a significant degree of ion pairing. The implications of the HNO3 loss and the formation of the particulate nitrate product for atmospheric chemistry are discussed.

Graphical abstract: Heterogeneous conversion of calcite aerosol by nitric acid

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Publication details

The article was received on 25 Sep 2006, accepted on 15 Nov 2006 and first published on 08 Dec 2006

Article type: Paper
DOI: 10.1039/B613913B
Citation: Phys. Chem. Chem. Phys., 2007,9, 622-634
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    Heterogeneous conversion of calcite aerosol by nitric acid

    A. Preszler Prince, V. H. Grassian, P. Kleiber and M. A. Young, Phys. Chem. Chem. Phys., 2007, 9, 622
    DOI: 10.1039/B613913B

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