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| Size distributions of water-soluble inorganic ions of atmospheric aerosol particles in autumn in Jinan |
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Abstract Aerosol samples were collected in urban Jinan during October 2009 by a 8-stage Micro-Orifice Uniform Deposit Impactor. To characterize mass size distributions of water-soluble inorganic ions of atmospheric aerosol particles, the ions were analyzed by ion chromatography. SO42-, NO3-, NH4+ , and Ca2+ were the most abundant ions which accounted for 92% of the total water-soluble ions. The concentrations of SO42-, NO3-, NH4+, K+, and Cl- showed a sharp change, which was influenced mainly by wind speed and direction. The size distributions of SO42- and NH4+ were single-modal, and the major fraction was present in the fine mode. The peaks in SO42- and NH4+ shifted from 0.32-0.56 μm to 1-1.8 μm when their mass concentration increased. The size distributions of NO3- were bi-modal. Its peak in the fine-mode shifted from 0.56-1 μm to 1-1.8 μm when the mass concentration increased. The NO3- peak in coarse-mode was at 3.2-5.6 μm. In addition, our study results show that NH4+ could completely neutralize SO42- and NO3- in fine particles, as (NH4)2SO4 and NH4NO3 aerosol particles.
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Received: 10 September 2010
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