Characteristics of mass and ionic compounds of atmospheric particles in winter and summer of Beijing-Tianjin-Hebei area,China
Characteristics of mass and ionic compounds of atmospheric particles in winter and summer of Beijing-Tianjin-Hebei area,China
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作者：
X. Dao
To investigate particle pollution in BTH(Beijing Tianjin and Shijiazhuang) area,PM2. 5and PM10 samples were collected at three urban sites(Beijing,Tianjin and Shijiazhuang) and four National Atmospheric Back ground sites in the winter and summer of 2013. The mass concentrations were measured and inorganic water-soluble ions were analyzed. The results show that the mass concentrations were quite high in winter,and the Shijiazhuang site had the highest concentrations.However,in summer,the particle concentration was higher in Beijing and Tianjin. The correlations of PM2. 5and PM10 were strong in all the sites of the BTH area,and the correlation coefficient(r) was0. 8796 in winter and 0. 8424 in summer,suggesting that the particulate pollution sources of the whole regional were similar. The concentrations of water-soluble ion concentrations showed similar characteristics in both summer and winter,which was NO-3,SO2-4,NH+4 Cl-,Ca2 + K+,Na+F-,Mg2 +. Shijiazhuangwasthe most polluted site in winter,and while in summer it was Beijing. Thesecondary ions were the most important compounds in the particles of this area,because they accounted for a large fraction of PM2. 5and PM10. SNA(total concentration of sulphate,nitrite and ammonium) accounted for 48. 9%,27. 8% of PM2. 5and PM10 in winter,respectively and 58. 7%,48. 5% in summer. Secondary compounds were mainly concentrated in PM2. 5,suggesting that the secondary ions play a more important role in fine particles. Compared with the historical data,the contribution of NO-3was higher than before,but the contribution of SO2-4was lower. The enrichment ability of soluble ions is stronger in smaller particles. The contribution of the total water soluble ions to PM1 was more than 50%,and 73. 9% —94. 8% in PM2. 5.
