Chemical Composition Characteristics And Source Apportionment Of Size-fractionated Particulate Matters In Jinan

In recent years,haze events have been occurred frequently in North China and have seriously harmed to the ecological environment and human health,thus the atmospheric fine particulate matters has become one of the urgent environmental problems to be solved.The distribution of PM_1.0 and PM_2.5 during the haze and non-haze days and size distribution of WSIIs in sunmer were studied in this paper,and the effect of fine particulate matters on the formation of haze days was also studied.Principal component analysis?PCA?method and back trajectory were used to analyze the source of pollutants and the contribution of long distance transmission to air pollution in Jinan,The main conclusions are as follows:The concentrations of PM_2.5,PM_1.0 and PM_1.0-2.5 in winter were 160.04 ± 83.00 ?g/m3,95.06±40.99?g/m3 and 64.98 ± 52.67 ?g/m3,respectively.During the haze days,the concentrations of NO3-,SO42-,NH4+ in PM_1.0 were significantly higher than that in PM_1.0-2.5,and the increase of the concentrations of secondary inorganic ions in the particles could result in the formation of haze.OC increased significantly and EC also increased during the haze days.Percentage of SOC in OC was significantly higher than that in the non-haze days,OC mainly concentrated in the particle with size ?1.0 ?m,and the size distribution of EC particle is not obvious.The total concentration of inorganic elements in haze days was significantly higher than that in the non-haze days,and the haze and non-haze days were favorable for the accumulation of toxic and harmful elements and crustal elements,respectively.The smaller the particle size,the more favorable the elements of anthropogenic sources of pollution enrichment.NO3-,SO42-,HN4+ were the main inorganic ionic components in fine particles in summer,accounting for 25.21%,21.83%and 35.92%of the WSIIs,respectively.Secondary ions were the main components in coarse particles,while the concentration of Ca2+ in coarse particles was significantly increased to 30.59%.The secondary ions NH4+,SO42-,NO3-were single peak distribution,and mainly distributed in fine particles,the peak were 1.0?1.8 ?m.In this study,the main sources of fine particles in Jinan during the haze days are secondary formation,coal combustion,biomass burning,soil dust and waste incineration.The secondary formation,soil dust and biomass combustion are the main sources of particles in summer in Jian.The atmosphere environment is mainly affected by the short-distance transport air mass at low altitude in haze days.The long-distance air transport from North Asia and Russia has a significant effect on non-haze day.While the long-distance transmission from the Yellow Sea and the surrounding areas of Hebei,Jiangsu,Tianjin and other areas of Jinan is the main source of summer airflow.