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Ammonia (NH3) is the most important alkaline pollution gas in the atmosphere, and the nitrogen-containing organic compounds formed by photooxidation with toluene is the main component of atmospheric brown carbon (BrC). Inorganic seed aerosols such as ammonium sulfate and calcium chloride can affect the formation and chemical composition of secondary organic aerosol (SOA), because of their large surface area. The effects of seed aerosols with different ingredients, concentrations, humidity and acidity on the formation of nitrogen-containing organic compounds were studied qualitatively by UV-Vis spectrometry in this study. The results showed that inorganic seed aerosols promoted the formation of nitrogen-containing organic compounds. The order of promotion is calcium chloride > sodium silicate > ammonium sulfate > sodium chloride > ammonium nitrate. The formation concentration of nitrogen-containing organic products gradually increases with the increase of calcium chloride seed aerosol concentration and acidity. When the seed aerosol is alkaline, it is not conducive to its formation. The increase of water molecules would reduce the concentration of nitrogen-containing organic products as the relative humidity increases. These would provide new experimental basis for the formation mechanism of brown carbon of aromatic SOA.

polish journal of environmental studies

Effects of Inorganic Seed Aerosol on the Formation of Nitrogen-Containing Organic Compounds from Reaction of Ammonia with Photooxidation Products of Toluene