Study Of Chemical Composition Features And Sources Apportionment Of Atmospheric Particulate Matter During Haze In Shijiazhuang

Beijing-Tianjin-Hebeiregion,the Yangtze River Delta, Pearl River Delta, the Guanzhong Plain and Chengdu basin, are themost serious haze pollution areas caused by atmospheric particles.also the high emission areas for gaseous pollutants in China.The research and source analysis for haze in Shijiazhuang,is an important part of the Beijing-Tianjin-Hebei regional joint prevention and control of air pollution,But the little reported about the size distribution of thewater-soluble and other chemical compositions In atmospheric particles in Shijiazhuang, and the source apportionment combined with chemical composition of atmospheric particulate matter is just started.To investigate the Chemical compositions and concentration of the atmospheric particulate matterfor source apportionment of atmospheric particulates during haze days of the four seasons in Shijiazhuang,the particle samples were collected by an Andersen cascade impactor during June to August,October to November in 2013 and January,April to May in 2014,To illuminate the air pollution situationthe atmospheric pollutants were measured by the environmental equipment and quartz element oscillating microbalance (TEOM) of America ThermoElectron Corporation.Use ion chromatograph, optical carbon analyzer and inductively coupled plasma mass spectrometry (ICP-MS) to analysis 8 kinds of water soluble inorganic ions in aerosols (Na+ NH4+·K+·Mg2+·Ca2+·Cl·NO3-·SO42-),EC/OC and 24 kinds of metal elements respectively.The EPA PMF5.0 model was used to source apportionment of atmospheric fine particles during the haze pollution.The results are as follows:The concentrations of particle have obvious seasonal variation characteristics during the sampling period in Shijiazhuang.The average concentration of PM2.5 was the highest in winter,second in autumn, lowest in summer.The average concentrations of PM2.5 in summer,autumn,winter and spring were 73.9±33.0,272.8±142.4,170.5±75.7,75.4±42.0μg/m3 respectively.the seasonal changes of NO2 and SO2 were as same as the PM2.5.The average concentrations of SO2 in summer,autumn,winter and spring were 38.3±16.7,68.5±26.9,199.5±70.0,37.1±15.3μg/m3 respectively.The average concentrations of NO2 in summer,autumn,winter and spring were 42.5±18.0,87.4±20.5,113.8±31.4,44.2±19.0μg/m3 respectively.The change of O3 concentration was mainly affected by temperature, humidity, solar ultraviolet radiation intensity etc.The Sliding average concentrations for 8 hours of O3 were 169.5±50.0,36.8±20.1,11.73±13.4,137.6±37.8 μg/m3.The concentration of water-soluble ions of atmospheric particles have obvious seasonal variations, the total water soluble ions concentration in winter was the highest,theconcentration in spring>summer> autumn. The water soluble ion concentration increase was mainly due to the growth of the secondary ions.Heavy haze days with higher relative humidity, and promote the aerosols in the liquid phase reaction,the sign of secondary ions transfer from the condensate mode to the droplet mode obviously.OC/EC in light haze days and the heavy haze days had the same seasonal distribution characteristics.The concentration of OC in winter was the highest,the concentration of OC in spring was the lowest,summer higher than in autumn.The concentration of EC was winter>spring>summer> autumn.OC/EC show the typical bimodal distribution,but the peak particle size and the peak height were differences in different seasons.The distribution of heavy metals in atmospheric particles generally appear consistent with atmospheric particulate matter concentrations seasonal change.The analytic results of fine particle source in Shijiazhuang show that,there are 6 class sources:dust (13.4%), the secondary source (15.6%), transportation (21.2%), industrial sources (26.8%), coal burning(11.0%) and uncertain part (12.1%).The largest contribution for PM2.5 was the industrial and traffic in a total of 48%, the main source of traffic for resulting in diesel locomotive. So haze pollution need priority control industrial source of emissions, accelerate the improvement of diesel locomotive and product upgrading, at the same time to control other pollution emissions to reduce the contribution of the secondary source, road dust is also cannot be ignore.