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Atmospheric and Oceanic Optics

2021 year, number 6

Surface properties of aerosol microparticles from mineral zircon under tropospheric conditions

V.S. Zakharenko1, E.B. Daybova2
1Novosibirsk State University, Pirogova Street, Novosibirsk, Russia, 630090
2Siberian Research Institute of agriculture and peat Russian academy of agricultural sciences, Tomsk, Russia
Keywords: zircon mineral, precipitated aerosol, tropospheric conditions, adsorbed layer, photodesorption, photoadsorption, quantum yield

Abstract

The adsorption and photosorption properties of aerosol particles from zircon (ZrSiO4) have been studied under conditions similar to tropospheric. For the aerosol, the physicochemical characteristics were determined by diffuse reflection spectroscopy. The analysis of the composition of the adsorbed layer formed in the troposphere is carried out. In the dark, mainly carbon dioxide is desorbed from the surface of zircon microparticles, as when illuminating the surface of aerosol particles. The kinetic dependences of СО2 desorption and О2 adsorption in the dark and under illumination are studied. The quantum yields and spectral dependences of the quantum yields of photodesorption and photoadsorption are determined. The spectral dependences of the effective quantum yield confirm the photochemical activity of the deposited aerosol from zircon under solar irradiation (l > 300 nm).