Characteristics and sources of chemical composition of atmospheric precipitation in Tianjin

被引：0
|
作者：
Xiao, Zhimei [1 ]
Li, Peng [1 ]
Chen, Kui [1 ]
Sun, Ren [1 ]
Feng, Yinchang [2 ]
Liu, Baoshun [3 ]
Qiao, Chunming [4 ]
机构：
[1] Tianjin Environmental Monitoring Center, Tianjin
[2] State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin
[3] Tanggu Environmental Monitoring Station, Tianjin
[4] Jixian Environmental Monitoring Station, Tianjin
来源：
Research of Environmental Sciences | 2015年 / 28卷 / 07期
关键词：
Chemical composition; Enrichment factor; Precipitation; Source apportionment; Tianjin;
D O I：
10.13198/j.issn.1001-6929.2015.07.02
中图分类号：
学科分类号：
摘要：
To better understand the characteristics and sources of chemical composition of atmospheric precipitation in Tianjin, precipitation samples were collected at Tianjin Environmental Monitoring Center, Tanggu Environmental Monitoring Station and Jixian Environmental Monitoring Station from January to December 2013. The values of pH, electrical conductivity (EC) and main ions were analyzed. The volume-weighted means of pH and EC were 5.58 and 98 μS/cm, respectively. The volume-weighted mean equivalent concentrations of precipitation components showed a decreasing order Ca2+>SO42->NH4+>NO3->Cl->Mg2+>Na+>F->K+. Ca2+, SO42-, NH4+, NO3- and Cl-were the dominant compositions in precipitation, accounting for 91.3% of the total ions. The ratio of SO42-/NO3- in precipitation was 2.1 in 2013, which represented a decreasing trend over the past decade. This shows that the type of air pollution in Tianjin clearly changed to be complex pollution. Significant seasonal variations in the total ionic equivalent concentrations existed; the total concentrations were high in winter and low in summer. SO42-, NH4+ and NO3- showed high values in winter, while Ca2+ varied slightly in spring and winter. The chemical compositions of precipitation at the studied sites were influenced by compositive sources, industrial and marine sources, and industrial and agricultural sources. The enrichment factor was used to assess sources of major ions. Ca2+ and K+ were determined to be mainly originated from crust sources. Mg2+ was partly from marine sources, though the contribution from soil sources was also considerable. Cl-mainly came from both marine and anthropogenic sources, while SO42- and NO3- were mostly attributable to anthropogenic sources. ©, 2015, Editorial department of Molecular Catalysis. All right reserved.
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页码：1025 / 1030
页数：5
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