Pollution Characteristic And Sources Of Organic Compounds In The Atmospherical Particles In Shijiazhuang

Shijiazhuang is located in Beijing-Tianjin-Hebei（BTH）region.The air pollution in Shijiazhuang is heavy for its special geographical environment and industrial structure.In recent years,the haze weather occurred frequently in Shijiazhuang.Atmospheric fine particulate matter is the primary pollutant of the haze weather.Organic Matter（OM）is the main components of fine particulate matter,many have carcinogenic,teratogenic and mutagenic effect.Organic Carbon（OC）and Element Carbon（EC）is the main form of OM in particulate matter,Polycyclic Aromatic Hydrocarbons（PAHs）is the typical organic matter of “three” effects significantly and damage to human health and atmospheric environment.PM₁₀,PM_2.5 and PM₁ samples were obtained at suburbs area and urban area in Shijiazhuang city from May 2015 to April 2016.The fine particulate matter concentrations and the correlation between PM₁₀,PM_2.5 and PM₁ were analyzed,the effect of meteorological parameters to particulate matter were discussed;The concentrations and composition characteristics of OC,EC and PAHs in fine particulate matter were analyzed,the correlation coefficient between meteorological parameters and OC,EC,PAHs were calculated and the change of OC,EC,PAHs under the different meteorological parameters were analyzed;the OC/EC ratio method,the characteristics of compound ratio method and principal component analysis method were applied to analyse qualitatively and quantitatively the sources of OC,EC and PAHs.The conclusions were as follows:The air pollution in winter at Shijiazhuang was serious and the primary pollutants were PM_2.5 and PM₁;OC is the main component of fine particles PM_2.5 and PM₁,the average proportion is 24.78% and 29.02%;the absolute concentration of B（a）P was far beyond the standard value,but total PAHs accounted for a small proportion of OM in particulate matter;the effect of meteorological parameters on PAHs concentrations were studied,relative humidity showed significant positive correlation with particulate matter,OC and EC,wind speed showed significant negative correlation with particulate matter and PAHs,temperature showed significant negative correlation with OC,EC and PAHs;The results of qualitative analysis of OC,EC and PAHs in the atmospheric particles showed that coal combustion and vehicle exhaust was the main source,application of principal component analysis method for quantitative analysis of its origin,the results showed that the contribution of coal combustion and vehicle emission of organic matter accounted for 46.36-55.60%;the contribution to PAHs was 48.51-55.93%.