title: [On-line analysis and mass concentration characters of the alkali metal ions of PM10 in Beijing].
abstract: The mass concentration characters and the sources of water-soluble alkali metal ions in PM10 in 2004 and 2005 in Beijing were analyzed by using the system of rapid collection of particles. The result showed that the average concentration of Na+, K+, Mg2+ and Ca2+ was 0.5-1.4, 0.5-2.5, 0.1-0.5 and 0.6-5.8 microg/m3, respectively. The highest and lowest concentration appeared in different seasons for the alkali metal ions, which was related to the quality and source. The concentration of alkali metal ions was no difference between the heating period and no heating period, which meant the heating was not the main source. Sea salt and soil were the important sources of Na+. The source of K+ came from biomass burning and vegetation. Soil was the large source of Mg2+ and Ca2+. The alkali metal ions appeared different daily variation in different seasons. Precipitation could decrease the concentration of Na+, K+, Mg2+ and Ca2+, which was 10%-70%, 20%-80%, 10%-77%, 5%-80% respectively.
authors.affiliation: Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China. zhangk96@163.com
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.forename: Yue-Si
authors.initials: YS
authors.lastname: Wang
authors.forename: Tian-Xue
authors.initials: TX
authors.lastname: Wen
authors.forename: Guang-Ren
authors.initials: GR
authors.lastname: Liu
authors.forename: Bo
authors.initials: B
authors.lastname: Hu
authors.forename: Ya-Nan
authors.initials: YN
authors.lastname: Zhao
mesh_terms: D000336:Aerosols / Q000032:analysis; D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D002681:China; D008274:Magnesium / Q000032:analysis; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis* / Q000737:chemistry; D011188:Potassium / Q000032:analysis*; D012621:Seasons; D012964:Sodium / Q000032:analysis*; D012995:Solubility
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D052638:Particulate Matter; D012964:Sodium; D008274:Magnesium; D011188:Potassium