Issue 1, 2008

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

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

Article information

Article type
Paper
Submitted
22 Aug 2007
Accepted
22 Oct 2007
First published
21 Nov 2007

Phys. Chem. Chem. Phys., 2008,10, 142-152

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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