The PM2.5 samples were synchronously collected in urban and suburban areas of Xiamen city during August and December in 2014 to investigate the characteristics and sources of water-soluble ions in atmospheric PM2.5. Nine water-soluble ions (F-, Cl-, NO3-, SO42-, Na+, K+, NH4+, Ca2+, Mg2+) were determined by ion chromatography. The level of water-soluble ions in PM2.5 of Xiamen city was relatively lower, and the sum concentrations (μg/m3) of total water-soluble ions showed the order of urban area in winter (18.16) > suburban area in winter (14.55) > suburban area in summer (6.87) > urban area in summer (5.33). Precipitation had a significant effect on the removal of water-soluble ions in PM2.5. Anions in PM2.5 were relative loss in summer, whereas opposite in winter. SO42-, NO3-, NH4+ (SNA) were the major components of water-soluble ions in PM2.5 with a contribution of more than 79.64% to total water-soluble ions, suggesting that the level of secondary ions was relatively high. Correlation analysis and SNA triangular diagram showed that NH4+ in PM2.5 mostly coexisted in the form of (NH4)2SO4 followed by NH4NO3 and alkaline free NH4+ in summer, while mostly in the form of (NH4)2SO4 andNH4NO3 followed by NH4Cl in winter. The mass ratio of N/S demonstrated that the main source to the water-soluble ions in PM2.5 of Xiamen city was coal combustion in summer, while the traffic emissions in winter. Overall, the water-soluble ions in PM2.5 of Xiamen city presented the composite pollution characteristics of traffic source and coal combustion, but barely influenced by marine source. Principal component analysis further indicated that the water-soluble ions in PM2.5 of Xiamen city mainly came from coal combustion, traffic emission and biomass burning.
张棕巍, 胡恭任, 于瑞莲, 胡起超, 刘贤荣. 厦门市大气PM2.5中水溶性离子污染特征及来源解析[J]. 中国环境科学, 2016, 36(7): 1947-1954.
ZHANG Zong-wei, HU Gong-ren, YU Rui-lian, HU Qi-chao, LIU Xian-rong. Characteristics and sources apportionment of water-soluble ions in PM2.5 of Xiamen City, China. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(7): 1947-1954.
Cheng M C, You C F, Cao J J, et al. Spatial and seasonal variability of water-soluble ions in PM2.5 aerosols in 14major cities in China [J]. Atmospheric Environment, 2012,73(6):182-192.
Jacob D J, Winner D A. Effect of climate change on air quality [J]. Atmospheric Environment, 2009,43(1):51-63.
[5]
Pope C A, Dockery D W. Health effects of fine particulate air pollution: lines that connect [J]. Journal of the Air & Waste Management Association, 2006,56(6):709-742.
[6]
Svenningsson B, Hansson H C, Wiedeneohler A, et al. Hygroscopic growth of aerosol particles and its influence on nucleation scavenging in cloud: experimental results from Kleiner Feldberg [J]. Journal of Atmospheric Chemistry, 1994,19(1):129-152.
[7]
Hassanvand M S, Naddafi K, Faridi S, et al. Indoor/outdoor relationships of PM10, PM2.5, and PM1 mass concentrations and their water-soluble ions in a retirement home and a school dormitory [J]. Atmospheric Environment, 2014,82(1):375-382.
Zhang T, Cao J J, Tie X X, et al. Water-soluble ions in atmospheric aerosols measured in Xi'an, China: Seasonal variations and sources [J]. Atmospheric Research, 2011,102(1):110-119.
Wang Y, Zhuang G S, Zhang X Y, et al. The ion chemistry, seasonal cycle, and sources of PM2.5 and TSP aerosol in Shanghai [J]. Atmospheric Environment, 2006,40(16):2935-2952.
[23]
Kang C, Lee H S, Kang B, et al. Chemical characteristics of acidic gas pollutants and PM2.5 species during hazy episodes in Seoul, South Korea [J]. Atmospheric Environment, 2004,38(28):4749-4760.
Wang G H, Wang H, Yu Y J, et al .Chemical characterization of water-soluble components of PM10 and PM2.5 atmospheric aerosols in five locations of Nanjing, China [J]. Atmospheric Environment, 2003,37(21):2893-2902.
[26]
Morales J A, Pirela D, de Nava M G, et al. Inorganic water soluble ions in atmospheric particles over Maracaibo Lake Basin in the western region of Venezuela [J]. Atmospheric Research, 1998,46(3):307-320.
[27]
Watson J G, Chow J C, Lurmann F W, et al. Ammonium nitrate, nitric acid, and ammonia equilibrium in wintertime Phoenix, Arizona [J]. Journal of the Air and Waste Management Association, 1994,44(4):405-412.
[28]
Mukerjee S, Shadwickb D S, Smith L A, et al. Techniques to assess cross-border air pollution and application to a US-Mexico border region [J]. Science of the Total Environment, 2001, 276(1-3):205-224.
[29]
Zhang R, Tao J, Hsu S C, et al. Chemical characterization and source apportionment of PM2.5 in Beijing: seasonal perspective [J]. Atmospheric Chemistry & Physics, 2013,13(14):7053-7074.
[30]
Zheng X Y, Liu X D, Zhao F H, et al . Seasonal characteristics of biomass burning contribution to Beijing aerosol [J]. Science in China Series B: Chemistry, 2005,48(5):481-488.
