The Research Of PM_2.5 Pollution Rules And Distribution Characteristics Of Chemical Components In Shenyang's Atmospher

Suspended particulates which size less than 2.5?m in the air dynamics,also known as the lung particles,absorb heavy metals,organic matters,bacteria and viruses easily,they are important component which has environmental and health effects in aerosol.PM_2.5 was selected as the research object,and the sampling was carried on for a year according to the season,the concentrations of PM_2.5 and the inorganic elements,organic carbon,element carbon and water soluble ion distribution characteristics are analyzed.Main conclusions are as follows:?1?Shenyang's annual PM_2.5 mass concentration was 66.59?g/m³.The concentration of spring,summer,autumn and winter was 70.24?g/m³,48.29?g/m³,53.61?g/m³,94.20?g/m³ respectively.Spring and winter are the heavy pollution seasons while summer and autumn standard in good condition.?2?Seasonal variation trend analysis showed that the seasonal change trend of total water soluble ion is?37.89?g/m³?in winter>?19.70?g/m³?in summer>?18.21?g/m³?in spring>?17.63?g/m³?in autumn;characteristics of inorganic ele ment average mass concentration seasonal variation is summer>autumn>spring>winter;mass concentration of OC seasonal variation trend is winter?20.46?g/m³?>spring?8.44?g/m³?>autumn?8.07?g/m³?>summer?5.13?g/m³?;the quality of t he EC concentration changing trend is winter?4.89?g/m³?>autumn?3.59?g/m³?>s pring?2.96?g/m³?>summer?2.35?g/m³?.?3?Composition analysis showed that:inorganic elements were the highest content of PM_2.5 in Shenyang,the relative proportion is 45.31%,followed by the water soluble ion,accounting for 31.56%,carbon component accounted for minimum.The ratio of inorganic element increased in summer,while water soluble ion and carbon component concentrations were significantly increased in winter.?4?The Correlation analysis showed that the concentrations correlated with relative humidity,wind speed and visibility was very high in Shenyang's winter of PM_2.5.Winter of PM_2.5 are greatly influenced by phase factors.OC and EC have good correlation and their sources have great consistency;The NO₃^-/SO₄^2-in spring and winner far higher than its in summer and autumn,because the dust have great impact on SO₄^2-and NO₃^-in spring,while is mainly affected by temperature inversion reaction;no machine elements in summer;Si is the highest content of inorganic elements,the mass concentration of 8.19?g/m³,correlation analysis among elements shows that Fe,Al,Ti have same source.The impact of Cd,Zn,Pb caused by soil dust is small.?5?Principal component analysis showed that the water soluble ion in Shenyang PM_2.5 mainly came from the soil and construction dust,biomass and fossil fuel combustion and emissions of industrial production;inorganic elements mainly come from the earth's crust surface and soil rock weathering,industrial production,transportation and emissions of coal;the main source of carbon composition of gasoline vehicle exhaust gas and coal gas.