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Volume 130, 2005
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Direct observation of completely processed calcium carbonate dust particles

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Abstract

This study presents, for the first time, field evidence of complete, irreversible processing of solid calcium carbonate (calcite)-containing particles and quantitative formation of liquid calcium nitrate particles apparently as a result of heterogeneous reaction of calcium carbonate-containing mineral dust particles with gaseous nitric acid. Formation of nitrates from individual calcite and sea salt particles was followed as a function of time in aerosol samples collected at Shoresh, Israel. Morphology and compositional changes of individual particles were observed using conventional scanning electron microscopy with energy dispersive analysis of X-rays (SEM/EDX) and computer controlled SEM/EDX. Environmental scanning electron microscopy (ESEM) was utilized to determine and demonstrate the hygroscopic behavior of calcium nitrate particles found in some of the samples. Calcium nitrate particles are exceptionally hygroscopic and deliquesce even at very low relative humidity (RH) of 9–11% which is lower than typical atmospheric environments. Transformation of non-hygroscopic dry mineral dust particles into hygroscopic wet aerosol may have substantial impacts on light scattering properties, the ability to modify clouds and heterogeneous chemistry.

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Publication details

The article was received on 16 Nov 2004, accepted on 16 Jan 2005 and first published on 27 May 2005


Article type: Paper
DOI: 10.1039/B417366J
Faraday Discuss., 2005,130, 453-468

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    Direct observation of completely processed calcium carbonate dust particles

    A. Laskin, M. J. Iedema, A. Ichkovich, E. R. Graber, I. Taraniuk and Y. Rudich, Faraday Discuss., 2005, 130, 453
    DOI: 10.1039/B417366J

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