Size Distributions Of Atmospheric Particulates And Water Soluble Inorganic Ion In Aerosol Particles In Mining City

To characterize size distributions of atmospheric particles and water-soluble inorganic ions in mining city, samples of TSP、PM10、PM2.5 were collected in six different functional areas in Huainan. Daily variation tendency and concentration of water-soluble ions include F-, Cl-, NO3-, SO42-, K+, Na+, Ca2+, Mg2+ were analyzed by chromatography. The main conclusions listed as follows:1) Particle pollution of Huainan is serious. The average mass concentrations of TSP, PM10, PM2.5 in Huainan was 231,146,93 μg·m-3. Mass concentration of TSP、PM10、 PM2.5 in winter were higher than that in summer and national secondary standard, with higher polluted of PM2.5 in winter. Mining area and industry area were higher polluted than other areas. Mass concentration of TSP and PM10 in Mining area and PM2.5 in industry area were higher than other areas. Particles of mining area and industry area in summer were composed of PM2.5 and PM2.5-10, while that of Shannan area, residential area and commercial area were mainly composed of PM2.5. Particles of every areas except mining area in winter were mainly composed of PM2.5, while that of mining areas was were mainly composed of PM2.5-10-PM2.5/TSP of cultural area in winter was higher than that in summer because of burning coal. The data of particulate matter increased at 8:00 and 19:00, and decreased at 12:00-16:00 in summer. The data has a large fluctuation in winter, which showed that mass concentration was mainly influenced by temperature in summer and human activities in winter. Daily variation of mass concentration of particles has a negative correlation with temperature because of its impact on atmospheric vertical convection, while has a relative correlation with humidity.2) p(TWSI) of PM2.5 was higher than that of PM2.5-10 in summer and winter. p(TWSI) of PM2.5-10 in winter closed to that in summer, while p(TWSI) of PM2.5 in winter was 3 times more than that in summer, with a serious pollution. Ca2+, NO3-, SO42- were main water-soluble ions in particles in Huainan, contributed 92% and 80% of mass concentrations of the total ions in PM2.5 and contributed 71% and 77% of mass concentrations of the total ions in PM2.5-10 of summer and winter. Source analyses of water-soluble ions indicated that the soil emissions, industrial emissions and secondary formation. NO3- and SO42- came from secondary chemical reactions of NOx and SO2, and these precursors mostly came from fossil fuel in summer while equally came from automobile exhaust and fossil fuel in winter.3) The average mass concentrations of TSP, PM10, PM2.5 in hazy weather was 329, 287,176μg·m-3, which were higher than national secondary standard. The daily variation tendency was similar to that in summer and winter with two peaks and little changed because of high concentration. Compared with hazy weather and other periods, the proportion of NO3- and SO42- in PM2.5 has decreased while the proportion of Ca2+ and K+ has clearly increased, showed that water-soluble ion of particles in hazy weather mainly came from biomass combustion, industrial emissions and the surface dust.