Sources Of Soluble Carbon And Ions In Atmospheric Particulates In Shanghai During The Smog Season

This paper collected 95 samples of atmospheric particulates during haze period in Shanghai.This paper analyzed the atmospheric particles of Shanghai PM2.5 water soluble chemical composition and the water soluble ions in different particle size distribution by ion chromatography in the fog season;and analyzed the atmospheric particles of Shanghai PM2.5 water soluble organic carbon and inorganic carbon in different particle size distribution by TOC.Via the main factor analysis using SPSS software for data,to analyze the source of the each ion and carbon in atmospheric particulate matter of Shanghai.Sampling points for xuhui campus of Shanghai normal university,sampling the month of December 2015,2016,1,2,and 3 month,data analysis can get conclusions as follows:?1?Via anion and cation balance analysis of PM2.5,12 month and 1,2,3 4 months have the closed correlation of anion and cation,the correlation coefficient between 0.94 0.95,the balance of anion and cation is good.Anion and cation of the monthly average molar concentration ratio between 0.9675 1.52,the overall water soluble ion is partial to weak acidic or alkaline.?2?NO₃^-?12.63?g/m3?keeps the highest percentage of the total mass ion in of PM2.5,thus NO₃^-is the primary pollutants in the Shanghai atmospheric particulate matter PM2.5;The second is SO₄^2-?8.52?g/m3?,accounting for the highest proportion is as high as 26.42%;ranked third is NH4+?6.79?g/m3?,in February,the highest,22.75%.So here is the Shanghai atmospheric particles PM2.5 mass concentration size relations: NO₃^-> SO₄^2-> NH4+.?3?December,January,January and March,obviously in December and January,the ion concentration is highest,Indicated that the two months are most polluted,While ion concentration had the lowest levels in March,showed that pollution degree is the lightest in March.Between January and March is February,as well as the pollution level is somewhere in between.this level of concentration distribution phenomenon is according with annual most serious haze pollution in China,the most polluted month is usually in December and January.?4?Average total ion mass concentration of Shanghai atmospheric particulates are mainly concentrated in the fine particulate matter,the most concentrated in grade 0.4 1.1?m.?5?The ratio of atmospheric particulates in Shanghai city PM2.5 water soluble ions NO₃^-/ SO₄^2-is higher than that of other city,mobile sources of soluble ions of atmospheric particulates in Shanghai PM2.5 water with the largest proportion of mobile,the main source of automobile exhaust emissions,two pollutants,road dust and construction dust.Vehicle exhaust,coal emissions,biomass burning and road dust,in which the contribution of motor vehicle exhaust is dominant?6?In December,January,January and March,OC in the total mass of fine particulate matter concentrations were slightly higher in coarse particles in Shanghai atmospheric particulate matter,in December,the IC has a similar distribution features;However,in January and March,IC has the opposite the distribution characteristics,IC in the mass concentration of fine particulate matter was slightly lower than the total mass concentration in the coarse particles;In January,the particle size distribution of IC is even,so the IC in the mass concentration of fine particulate matter is approximately equal to the total mass concentration in the coarse particles.?7?The source between OC and HCOO-,NO₃^-,SO₄^2-,BrO₃^-,NH4+and K+,6 kinds of ion,has great relevance in PM2.5.