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Light Induced Conversion Of Nitrogen Dioxide Into Nitrous Acid On Submicron Humic Acid Aerosol, K. Stemmler, M. Ndour, Yasin F. Elshorbany, J. Kleffmann, M. Ammann, B. D'Anna, C. George, B. Bohn

USF St. Petersburg campus Faculty Publications

The interactions of aerosols consisting of humic acids with gaseous nitrogen dioxide (NO2) were investigated under different light conditions in aerosol flow tube experiments at ambient pressure and temperature. The results show that NO2 is converted on the humic acid aerosol into nitrous acid (HONO), which is released from the aerosol and can be detected in the gas phase at the reactor exit. The formation of HONO on the humic acid aerosol is strongly activated by light: In the dark, the HONO-formation was below the detection limit, but it was increasing with the intensity of the irradiation with visible light. …