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Size-differentiated composition of inorganic atmospheric aerosols of both marine and polluted continental origin
Abstract Atmospheric aerosols were sampled with a high volume impactor/diffusion battery system and the collected fractions analysed for their major water-soluble inorganic constituents. Sulphate, nitrate and chloride showed bimodal distributions; sulphate and nitrate were mainly associated with NH4 +, having approximately log-normal distributions with modes at 1.0 μm. In unpolluted maritime air, chlorides appeared as salts of sodium and magnesium with average modes at c. 5 μm, whilst in polluted air masses significant concentrations of ammonium chloride sub-μm aerosols were detected. Sodium nitrate and sodium sulphate aerosols having average modes of c. 3.5 μm were observed in mixed maritime/polluted air masses. The dimensions of these particles indicate formation from absorption of H2SO4 and HNO3 at the surface of marine NaCl particles. The concentration of H+ was very low, but the possibility of its neutralization by atmospheric ammonia during sampling was ruled out by parallel air sampling using an ‘ammonia denuder’.
Size-differentiated composition of inorganic atmospheric aerosols of both marine and polluted continental origin
Abstract Atmospheric aerosols were sampled with a high volume impactor/diffusion battery system and the collected fractions analysed for their major water-soluble inorganic constituents. Sulphate, nitrate and chloride showed bimodal distributions; sulphate and nitrate were mainly associated with NH4 +, having approximately log-normal distributions with modes at 1.0 μm. In unpolluted maritime air, chlorides appeared as salts of sodium and magnesium with average modes at c. 5 μm, whilst in polluted air masses significant concentrations of ammonium chloride sub-μm aerosols were detected. Sodium nitrate and sodium sulphate aerosols having average modes of c. 3.5 μm were observed in mixed maritime/polluted air masses. The dimensions of these particles indicate formation from absorption of H2SO4 and HNO3 at the surface of marine NaCl particles. The concentration of H+ was very low, but the possibility of its neutralization by atmospheric ammonia during sampling was ruled out by parallel air sampling using an ‘ammonia denuder’.
Size-differentiated composition of inorganic atmospheric aerosols of both marine and polluted continental origin
Harrison, Roy M. (author) / Pio, Casimiro A. (author)
Atmospheric Environment ; 17 ; 1733-1738
1982-11-08
6 pages
Article (Journal)
Electronic Resource
English
Chemical Composition and Size Distribution of Atmospheric Aerosols
| British Library Conference Proceedings | 1996