title: [Characteristics of particulate matters and its chemical compositions during the dust episodes in Shanghai in spring, 2011].
abstract: A continuous air quality observation was conducted in the urban area of Shanghai from April 28 to May 18 in 2011. The mass concentration of particle matters and main chemical compositions of fine particle were measured and analyzed. The mass concentrations of PM10 and PM2.5 during the dust episode were much higher than those in non-dust episode, with the maximum daily mass concentrations of PM10 and PM2.5 reaching 787.2 microg.gm-3 and 139.5 microgm(-3) , respectively. The average PM2.5 /PM10 ratio was (32.9 +/-14. 6)% (15. 6% -85.1% ). The total water soluble inorganic ions(TWSII ) contributed (27.2 +/- 19. 2)% (4. 8% -80. 8% ) of total PM2.5, and the secondary water soluble ions (SNA) , including SO(2-)4 , NO-(3) and NH(+)(4) , were (76.9 +/- 13.9)% (41.9%-94.2%) in TWSIl. The concentrations of TWSII and SNA in PM2.5 during dust days became lower than those in non-dust days while the trend of the ratio of Ca2+ to PM2.5, increased. The mean OC/EC value in non-dust days was higher than that in the heavy dust pollution episode, but lower than that in weak dust days. In addition, mineral-rich particle in dust period had an acid-buffer effect, making particle alkaline in dust days stronger. In non-dust days, SO(2-)(4) and NO(-)(3) mainly existed in the form of NH4HSO4, (NH4)SO4, and NH4NO3, and combined with other mineral ions during dust days.
authors: Gui-Ling
authors: GL
authors: Li
authors: Min
authors: M
authors: Zhou
authors: Chang-Hong
authors: CH
authors: Chen
authors: Hong-Li
authors: HL
authors: Wang
authors: Qian
authors: Q
authors: Wang
authors: Sheng-Rong
authors: SR
authors: Lou
authors: Li-ping
authors: LP
authors: Qiao
authors: Xi-bin
authors: XB
authors: Tang
authors: Li
authors: L
authors: Li
authors: Hai-ying
authors: HY
authors: Huang
authors: Ming-hua
authors: MH
authors: Chen
authors: Cheng
authors: C
authors: Huang
authors: Gang-Feng
authors: GF
authors: Zhang
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D002947:Cities; D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring; D007477:Ions / Q000032:analysis; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D012621:Seasons
chemical_list: D000393:Air Pollutants; D004391:Dust; D007477:Ions; D052638:Particulate Matter