Characteristics of Carbon Components in Atmospheric Particles before and during the Heating Period in Shijiazhuang City
In order to study the characteristics of atmospheric particles,carbon components and sources in Shijiazhuang City,atmospheric particles samples (i.e., PM10, PM2.5and PM1) were collected from November 1 to December 31, 2016. The concentration of PM10, PM2.5,PM1,organic carbon (OC), elemental carbon (EC) and water-soluble organic carbon (WSOC) were investigated before and during heating period. Meanwhile, the correlation between the concentration of atmospheric particles and the carbon components were calculated. The source of atmospheric particles was analyzed by OC∕EC and the characteristics of the 8 carbon components (i.e., OC1, OC2, OC3,OC4,OPC,EC1,EC2 and EC3). (1) The results showed that ρ(PM10) and ρ(PM2.5) during heating period increased by 26.4% and 32.1% compared with those before heating period, while ρ(PM1) was decreased by 12.2%. ρ(PM10) and ρ(PM2.5) had significant relevance,while ρ(PM2.5) and ρ(PM1),ρ(PM10) and ρ(PM1) had poor correlations. During heating period,ρ(PM10) and ρ(PM2.5) increased by rural residential coal combustion. While motor vehicle limited and factory shutdown decreased ρ(PM1). (2) Through Pearson correlation coefficient calculation, ρ(OC) and ρ(EC) had strong correlation; ρ(PM10) and ρ(PM2.5) were strongly correlated with ρ(OC) and ρ(WSOC) respectively. While ρ(PM1) was medium correlated with them. ρ(PM10) and ρ(PM2.5) were weakly correlated with ρ(EC),and ρ(PM1) was medium correlated with ρ(EC). (3) ρ(OC) of PM10, PM2.5and PM1during heating period increased by 215.1%, 97.2% and 18.5% compared with before heating. ρ(EC) of PM10and PM2.5were increased by 65.2% and 5.3% than that before heating period,while ρ(EC) of PM1decreased by 10.9%. Central heating and rural residential coal combustion emitted a large number of OC. EC of PM10and PM2.5mainly came from rural residential coal combustion, EC of PM1came from industrial and motor vehicle emissions. (4) Before heating period,OC∕EC were 4.5,4.5 and 4.3 respectively in PM10,PM2.5and PM1. During heating period, OC∕EC were 9.8 and 9.7 respectively in PM10and PM2.5, while OC∕EC was 7.4 in PM1. The value of SOC∕OC were 0.36-0.65 indicated that the secondary pollution was very serious in Shijiazhuang City. (5) The analysis of 8 carbon components showed that ρ(EC1) of PM1decreased with the decrease of motor vehicle emissions, while ρ(OC2) increased significantly due to the increase of coal combustion. The research showed that the carbon aerosols mainly came from motor vehicle exhaust before heating period,but it mainly was mainly caused by coal combustion during heating period,especially rural residential coal combustion.
NETL
NSTL
万方数据
维普
