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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 102, NO. D2, PAGES 1883–1893, 1997

Thermodynamic and optical properties of mixed-salt aerosols of atmospheric importance

Ignatius N. Tang

Environmental Chemistry Division, Department of Applied Science, Brookhaven National Laboratory, Upton, New York

Abstract

Extensive water activity, density, and refractive index data at 25°C are reported for mixed-salt solutions, NaCl-KCl, NaCl-NaNO₃, NaCl-Na₂SO₄, Na₂SO₄-NaNO₃, and (NH₄)₂SO₄-Na₂SO₄. The data are obtained from hydration experiments using the single-particle levitation technique developed recently for measuring the thermodynamic and optical properties of microdroplets. These data, covering the whole concentration range from dilute solutions to high supersaturations, provide an opportunity to explore the light-scattering properties of both internal and external mixtures of the chloride, sulfate, and nitrate aerosols of atmospheric importance. It is shown that for sulfate and nitrate aerosols as solution droplets, the light-scattering properties do not differ appreciably among all mixture types and compositions, as long as the dry-salt aerosols have the same particle-size distribution. However, for mixed-salt aerosols containing NaCl, the light-scattering properties do depend upon the composition and particle-size distribution, although not so much on the mixture type.

Received 13 March 1996; accepted 30 September 1996.

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Citation: Tang, I. N. (1997), Thermodynamic and optical properties of mixed-salt aerosols of atmospheric importance, J. Geophys. Res., 102(D2), 1883–1893.

This paper is not subject to U.S. copyright. Published in 1997 by the American Geophysical Union.