Chongqing Typical Point PM _2.5 And Characteristics Of Water-soluble Ion Source Resolution

In this paper, in the spring of2012, summer, autumn, winter four season in Chongqing City, atypical point (Chongqing city atmospheric super station)sampling of the PM2.5atmospheric fineparticles, analysis of the quality of their concentrations variation. And the PM2.5fine particles ofwater-soluble ions were analyzed, the atmosphere of Chongqing City, water soluble ions of PM2.5pollution status and interaction, and using the factor analysis method (FA) sources of water solubleions were resolution. The main conclusions are as follows:(1)The2012sampling period typical point PM-32.5annual average concentration of99.21μg.m.Changes in PM32.5concentration of11.68~290.52μg.m-. And the sampling period PM2.5concentra-tion has diurnal variation and seasonal characteristic. The highest concentration of winter summer,the lowest concentration.(2) The study of Na+, NH+-4, K+, Mg2+, Ca2+, Cl-, NO3, SO2-4eight kinds of water soluble ionsby ion chromatography analysis. The total concentration of water soluble ions range of5.53~130.68μg.m-3, average is41.57μg.m-3. Water soluble ionic components accounted for44.67%ofthe total mass of PM2.5samples. Which SO2-4, NH+4, Ca2+, NO-3to PM2.5in the major water solubleions, the sum of four ions of90.72%of the total soluble ions.(3)Solution on seasonal variation of water-soluble ions found: SO2-4, NH+4in all ion concentra-tion in each season are ranked in the top two, the most important water-soluble ions ions. Water-soluble ion correlation analysis found that SO2-+4, NO-3, NH4has a good correlation between. Andthese three kinds of ions in the spring and autumn, mainly NH4NO3and (NH4)2SO4exists, but thesummer mainly exists in the form of NH4NO3and NH4HSO4. According to the cation anions balan-ce analysis: spring, autumn anion relative loss, the overall level of the alkaline ions; summercations relative losses, the overall level of acidic ions.(4) Analysis of typical point PM2.5water soluble ion source apportionment factor, the resultsshow that the typical point of water soluble ions of PM2.5change in the main source class has fivekinds: vehicle emissions, fossil fuels and biomass combustion, industrial production, soil dust andconstruction dust.