西藏日喀则地区夏、冬季大气颗粒物水溶性离子粒径分布特征
Size distributions of water-soluble inorganic ions in atmospheric particulate matter in Shigatse
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摘要: 为研究日喀则不同粒径大气颗粒物中水溶性无机离子的组成特征,利用Andersen分级撞击式采样器在夏、冬季进行大气颗粒物分级采样,采用离子色谱测定NH4+、Ca2+、K+、Mg2+、Na+、SO42-、NO3-和Cl-等 8种离子浓度.结果表明,夏、冬季总离子浓度分别为96483030、49251138 ngm-3.夏季离子浓度高低顺序为Cl-Ca2+NH4+Na+SO42-NO3-K+Mg2+,Cl-、Ca2+、NH4+和Na+占总离子浓度的比重为74.9%;冬季水溶性无机离子浓度高低顺序为Cl-SO42-NH4+NO3-Ca2+Na+K+Mg2+,Cl-、SO42-、NH4+和NO3-占总离子浓度的比重为88.0%.夏、冬季大气颗粒物中所有水溶性无机离子的粒径分布均成双峰型.夏季,大气颗粒物中SO42-与Mg2+ (r=0.951)、Ca2+ (r=0.947),NO3-与Mg2+ (r=0.904)、Ca2+ (r=0.843),在0.01水平(双侧)上均显著相关;冬季,细粒子中K+与Cl- (r=0.740)、SO42- (r=0.929)及NO3-(r=0.920),在0.01水平(双侧)上显著相关.Abstract: To investigate the size distributions of water-soluble inorganic ions in PM in Shigatse, samples were collected by Thermo Scientific Andersen impactor in summer and winter. Eight water-soluble inorganic ions, including NH4+, Ca2+, K+, Mg2+, Na+, SO42-, NO3- and Cl-were analyzed by IC. The results showed that concentrations of all ions were 96483030 ngm-3in winter and 49251138 ngm-3 in summer. Variations of ion concentrations were observed in the following order: Cl-Ca2+NH4+Na+SO42-NO3-K+Mg2+ in summer, and Cl-SO42-NH4+NO3-Ca2+Na+K+Mg2+ in winter. Concentrations of Cl-, Ca2+, NH4+ and Na+ accounted for 74.9% of all the ions in PM in summer, and those of Cl-, SO42-, NH4+ and NO3- accounted for 88.0% of all the ions in PM in winter. Correlations of SO42- and Mg2+ (r=0.951), Ca2+ (r=0.947) were significant at the 0.01 level, and those of NO3- and Mg2+ (r=0.904), Ca2+ (r=0.843) were also significant at the 0.01 level in summe. Correlations of K+ and Cl- (r=0.740), SO42- (r=0.929), NO3-(r=0.920) were significant at the 0.01 level.
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Key words:
- water-soluble inorganic ions /
- Shigatse /
- size distribution
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[1] Sun Y, Zhuang G, Tang A A, et al. Chemical characteristicsof PM2.5 and PM10 in haze-fog episodes in Beijing[J]. Environ Sci Technol, 2006, 40: 3148-3155 [2] [2] Hueglin C, Gehrig R, Urs B U, et al. Chemical characterisation of PM2.5, PM10 and coarse particles at urban, near-city and rural sites in Switzerland[J]. Atmospheric Environment, 2005, 39: 637-651 [3] [3] Pathak R K, Yao X, Lau A K, et al. Acidity and concentrations of ionic species of PM2.5 in Hong Kong[J]. Atmospheric Environment, 2003, 37(8): 1113-1124 [4] [4] Abbstt J, Broekhuizen K, Kumar P. Cloud condensation nucleus activity of internally mixed ammonium sulfate/organic acid aerosol particles[J]. Atmospheric Environment, 2005, 39(26): 4767-4778 [5] [5] Wake C P, Dibb J, Mayswski P A, et al. The chemical composition of aerosols over eastern Himalaya and Tibetan Plateau during low dust periods[J]. Atmospheric Environment, 1994, 28: 695-704 [6] [10] Garg A, Shuklaa P R, Bhattacharya S, Dadhwalc V K. Sub-region (district) and sector level SO2 and NOx emissions for India: Assessment of inventories and mitigation flexibility[J]. Atmospheric Environment, 2001, 35 (4): 703-713 [7] [11] Beguma B A, Kimb E, Biswasa S K, et al. Investigation of sources of atmospheric aerosol at urban and semi-urban areas in Bangladesh[J]. Atmospheric Environment, 2004, 38 (19): 3025-3038 [8] [16] Yang Y J, Wang Y S, Huang W W, et al. Size distributions and elemental compositions of Particulate matter on typical clear, haze and fog days in Beijing, China[J]. Advances in Atmospheric Sciences, 2010, 27(3): 663-675 [9] [21] Johansson L S, Tullin C, Leener B, et al. Particle emissions from biomass combustion in small combustors[J]. Biomass and Bioenergy, 2003, 25:435-446 -
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