title: Seasonal variations and size distributions of water-soluble ions in atmospheric aerosols in Beijing, 2012.
abstract: The characteristics of water-soluble ions in airborne particulate matter in Beijing were investigated using ion chromatography. The results showed that the total concentrations of ions were 83.7 ± 48.9 μg/m(3) in spring, 54.0 ± 17.0 μg/m(3) in summer, 54.1 ± 42.9 μg/m(3) in autumn, and 88.8 ± 47.7 μg/m(3) in winter, respectively. Furthermore, out of all the ions, NO3(-), SO4(2-) and NH4(+) accounted for 81.2% in spring, 78.5% in summer, 74.6% in autumn, and 76.3% in winter. Mg(2+) and Ca(2+) were mainly associated with coarse particles, with a peak that ranged from 5.8 to 9.0 μm. Na(+), NH4(+) and Cl(-) had a multi-mode distribution with peaks that ranged from 0.43 to 1.1 μm and 4.7 to 9.0 μm. K(+), NO3(-), and SO4(2-) were mainly associated with fine particles, with a peak that ranged from 0.65 to 2.1 μm. The concentrations of Na(+), K(+), Mg(2+), Ca(2+), NH4(+), Cl(-), NO3(-) and SO4(2-) were 2.69, 2.32, 1.01, 4.84, 16.9, 11.8, 42.0, and 44.1 μg/m(3) in particulate matter (PM) on foggy days, respectively, which were 1.4 to 7.3 times higher than those on clear days. The concentrations of these ions were 2.40, 1.66, 0.92, 4.95, 17.5, 7.00, 32.6, and 34.7 μg/m(3) in PM on hazy days, respectively, which were 1.2-5.7 times higher than those on clear days.
authors.affiliation: National Research Center for Environmental Analysis and Measurement, Beijing 100029, China. Electronic address: yyj800308@163.com.
authors.forename: Yongjie
authors.initials: Y
authors.lastname: Yang
authors.affiliation: National Research Center for Environmental Analysis and Measurement, Beijing 100029, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Zhou
authors.affiliation: Jiangsu Institute of Meteorological Sciences, Nanjing 210008, China.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Wu
authors.affiliation: National Research Center for Environmental Analysis and Measurement, Beijing 100029, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Beijing Urban Meteorological Engineering Technology Research Center, Beijing 100089, China.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Ma
authors.affiliation: Meteorological Observation Center, China Meteorological Administration, Beijing 100081, China.
authors.forename: Lejian
authors.initials: L
authors.lastname: Zhang
authors.affiliation: National Research Center for Environmental Analysis and Measurement, Beijing 100029, China. Electronic address: dya_62@hotmail.com.
authors.forename: Yi'an
authors.initials: Y
authors.lastname: Di
mesh_terms: D000336:Aerosols / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000032:analysis* / Q000517:prevention & control; D000068476:Beijing; D002852:Chromatography, Ion Exchange; D004784:Environmental Monitoring; D007477:Ions / Q000032:analysis; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D012621:Seasons; D012995:Solubility; D014867:Water / Q000737:chemistry; D014887:Weather
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D007477:Ions; D052638:Particulate Matter; D014867:Water
keywords: Beijing; Foggy day; Hazy day; Size distribution; Water-soluble ions