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Issue 1, 2008
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Reactive uptake of acetic acid on calcite and nitric acid reacted calcite aerosol in an environmental reaction chamber

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Abstract

The heterogeneous chemistry of gas-phase acetic acid with CaCO3(calcite) aerosol was studied under varying conditions of relative humidity (RH) in an environmental reaction chamber. Infrared spectroscopy showed the loss of gas-phase reactant and the appearance of a gaseous product species, CO2. The acetic acid is observed to adsorb onto the calcite aerosol through both a fast and a slow uptake channel. While the fast channel is relatively independent of RH, the slow channel exhibits enhanced uptake and reaction as the RH is increased. In additional experiments, the calcite aerosol was exposed to both nitric and acetic acids in the presence of water vapor. The rapid conversion of the particulate carbonate to nitrate and subsequent deliquescence significantly enhances the uptake and reaction of acetic acid. These results suggest a possible mechanism for observed correlations between particulate nitrate and organic acids in the atmosphere. Calcium rich mineral dust may be an important sink for simple organic acids.

Graphical abstract: Reactive uptake of acetic acid on calcite and nitric acid reacted calcite aerosol in an environmental reaction chamber

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Publication details

The article was received on 22 Aug 2007, accepted on 22 Oct 2007 and first published on 21 Nov 2007


Article type: Paper
DOI: 10.1039/B712915G
Citation: Phys. Chem. Chem. Phys., 2008,10, 142-152
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    Reactive uptake of acetic acid on calcite and nitric acid reacted calcite aerosol in an environmental reaction chamber

    A. P. Prince, P. D. Kleiber, V. H. Grassian and M. A. Young, Phys. Chem. Chem. Phys., 2008, 10, 142
    DOI: 10.1039/B712915G

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