title: [Characterization of water-soluble inorganic ions in PM2.5 and PM1.0 in summer in Guangzhou].
abstract: PM2.5 and PM1.0 samples were collected simultaneously during July of 2008 in Guangzhou. The concentrations of water-soluble inorganic ions (Na+, NH4+, K+, Mg2+, Ca2+, F-, Cl-, NO3-, and SO4(2-)) were determined by ion chromatography. Meteorological parameters, atmospheric scattering, visibility, and concentrations of trace gases (SO2, NO2, and O3) for this period were also recorded. The results showed the total water-soluble inorganic ions concentrations were (25.5 +/- 10.9) microg x m(-1) and (22. 7 +/- 10.5) microg x m(-3) in PM2.5 and PM1.0, which occupied (47.9 +/- 4.3)% and (49.3 +/- 4.3)% of PM mass respectively. Sulfate was the most abundant ion and contributed (25.8 +/- 4.0)% of PM2.5 mass and (27.5 +/- 4.5)% of PM1.0 mass respectively. High temperature and high ozone level favored the formation of sulfate from sulfur dioxide, while the high relative humidity favored the formation of nitrate were observed. Moreover, sulfate, nitrate, and ammonium in PM2.5 and PM1.0 had great impact on the scattering coefficient and visibility degradation.
authors.affiliation: South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China. taojun@scies.org
authors.forename: Jun
authors.initials: J
authors.lastname: Tao
authors.forename: Ren-jian
authors.initials: RJ
authors.lastname: Zhang
authors.forename: Lin
authors.initials: L
authors.lastname: Dong
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Li-hua
authors.initials: LH
authors.lastname: Zhu
authors.forename: Jing-lei
authors.initials: JL
authors.lastname: Han
authors.forename: Zhen-cheng
authors.initials: ZC
authors.lastname: Xu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D007287:Inorganic Chemicals / Q000032:analysis*; D009566:Nitrates / Q000032:analysis; D052638:Particulate Matter / Q000032:analysis*; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D012621:Seasons; D012995:Solubility; D013431:Sulfates / Q000032:analysis
chemical_list: D000393:Air Pollutants; D007287:Inorganic Chemicals; D009566:Nitrates; D052638:Particulate Matter; D000644:Quaternary Ammonium Compounds; D013431:Sulfates