| With the economic development of Jinan City,the urban infrastructure construction is more perfect,and the number of motor vehicles is constantly increasing.And the air pollution in Jinan City has become more complicated,and haze have occurred frequently.In recent years,a large number of scholars have reported many studies on particulate matter,but most of the research is concentrated in the Beijing-Tianjin-Hebei region,and research on the Shandong Peninsula is still relatively rare.To this end,this study focused on Jinan City,and during the period from November 19,2014 to January 27,2015,the PM2.5 and PM10 filter membranes collection work was carried out in the built-up area of Jinan City.The mass concentration of PM2.5 and PM10 and the main chemical components?water-soluble ions,carbon components?were analyzed.And the receptor models such as PMF and PCA were used to identify the source of particulate matter in the atmosphere.This study can provide a scientific basis for mastering the characteristics of atmospheric particulate matter pollution in Jinan City,and provide scientific support for air pollution prevention and control.The research results are as follows:?1?The winter particulate matter pollution in Jinan City is serious.The daily average values of PM2.5 and PM10 are?119.40±59.87??g/m3 and?232.45±168.65??g/m3,respectively.The average mass concentration of water-soluble ions in PM2.5 and PM10 is?54.11±32.29??g/m3,?78.66±57.44??g/m3,and the contribution of each ion to PM2.5formation in a decreasing order is NO3->SO42->NH4+>Cl->K+>Ca2+>Na+>F->Mg2+,and to PM10 is SO42->NO3->Ca2+>NH4+>Cl->K+>Na+>Mg2+>F-;SNA is the most important water-soluble ion in atmospheric particulate matter.The daily average concentrations of OC in PM2.5 and PM10 were?17.92±7.54??g/m3 and?27.51±12.61??g/m3,respectively,the daily average concentrations of EC were?7.57±2.89??g/m3,respectively?10.22± 4.74??g/m3.The stable weather conditions in winter are conducive to the accumulation of pollutants,which may be the cause of serious pollution problems and poor air quality in Jinan City.?2?The winter air pollution in the urban area of Jinan City is caused by the combined action of mobile and fixed source emissions.The balance of anion and cation in PM2.5and PM10 is better,and the particulate matter is acidic;Winter SOC pollution is more serious,by analyzing the backward trajectory clustering of atmospheric aerosol during sampling,it can be known that long-distance transport air masses from high-pollution areas such as Beijing-Tianjin-Hebei and North China are also important sources;R2between OC and EC is higher than 0.65,indicating that they may be emitted from same sources.?3?Combined with the comprehensive analysis of the concentration levels of water-soluble ions and carbon components in PM2.5 and PM10 in the urban area of Jinan City in winter,In winter,the high concentration of particulate matter in urban areas of Jinan City is mainly related to vehicle exhaust and coal-fired emissions;The source analysis results of PMF and PCA models indicate that the main sources of atmospheric particulate matter are vehicle exhaust sources,secondary pollution and bomass combustion sources;Dust sources,coal and industrial sources,biomass burning sources,coal-fired dust and catering soot are also important sources of pollution. |
PDF Full Text Request