| PM10,PM2.5 and PM1 were collected from November 2015 to September 2017 in Shijiazhuang.The chemical compositions were analyzed,which include inorganic elements,Water-soluble ions,Carbon components?OC,EC?,PAHs and n-alkanes.The PM10,PM2.5 and PM1 concentration levels and temporal and spatial characteristics were analyzed.The correlation between the chemical components,the ratio of the main component analysis and PMF source analysis were also analyzed in order to identify the source of atmospheric particulate in Shijiazhuang.Results showed that the average concentrations of PM10,PM2.5 and PM1 from November 2016 to May 2017 decreased by12.04%,13.44%and 40.62%respectively than that from November 2015 to May 2016,and PM1 decreased significantly.Relative humidity greater than 50%,with the increase of relative humidity,the concentration of atmospheric particles increased.The carbon dominance index of n-alkanes was less than 1,indicated that the main source of n-alkanes in atmospheric particles is anthropogenic sources such as fossil fuels or incomplete combustion of biomass;CPI2 was higher in summer,indicating that plant sources had a greater impact.The Principal component analysis of PAHs showed that coal combustion contributed much to PM10 in winter,while motor vehicle exhaust contributes much to PM1.The comparison of eight carbon components showed that the main source of PM10 in winter was coal combustion,and the motor vehicles was the main source in spring,summer and autumn.The road dust contributes significantly to PM2.5 pollution in spring and autumn.The analysis of inorganic elements indicates that elements in the atmosphere are mainly affected by human activities.In winter,the analysis of water-soluble ion principal component analysis showed that coal combustion has a higher contribution to PM10,while the motor vehicle exhaust contributes significantly to PM1.The contribution of chemical components in atmospheric particles from high to low were as follows:OC?SO42-?NO3-?Ca2+?NH4+?EC and Cl-.PMF source analysis showed that PM10 was mainly derived from mixed sources of coal combustion and transportation?45.9%?,other sources?33.4%?,dust sources?8.6%?,biomass combustion?8.4%?and industrial sources?3.7%?;PM2.5 was mainly derived from mixed sources of coal combustion and transportation?38.4%?,secondary sources?24.0%?,dust sources?20.4%?,industrial sources?12.0%?and other sources?5.2%?;PM1 was mainly derived from dust source?28.0%?,coal combustion?22.7%?,transportation source?21.9%?,industrial source?19.2%?and biomass combustion?8.2%?. |
PDF Full Text Request