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Chemical composition, sources, and deposition fluxes of water-soluble inorganic ions obtained from precipitation chemistry measurements collected at an urban site in northwest China
Shen, ZX (Shen, Zhenxing)[ 1,2 ]; Zhang, LM (Zhang, Leiming)[ 3 ]; Cao, JJ (Cao, Junji)[ 2 ]; Tian, J (Tian, Jing)[ 1 ]; Liu, L (Liu, Li)[ 1 ]; Wang, GH (Wang, Geihui)[ 2 ]; Zhao, ZZ (Zhao, Zhuzi)[ 2 ]; Wang, X (Wang, Xin)[ 1 ]; Zhang, RJ (Zhang, Renjian)[ 4 ]; Liu, SX (Liu, Suixin)[ 2 ]
2012-08-30
Source PublicationJournal of Environmental Monitoring
Volume14Issue:11Pages:3000-3008
Subtype期刊论文
Abstract

Precipitation samples were collected at an urban site in Xi'an, northwest China during March to November in 2009 and were then analyzed to determine the pH and concentrations of water-soluble inorganic ions (Na(+), NH(4)(+), K(+), Mg(2+), Ca(2+), SO(4)(2-), NO(3)(-), Cl(-), and F(-)) in precipitation. The pH of precipitation ranged from 4.1 to 7.6 for all of the samples with an annual volume-weighted mean of 6.4. While a large portion of the precipitation events were weakly acidic or alkaline, around 30% of the precipitation events in the autumn were strongly acidic. Precipitation events with air masses from the northeast and the southeast were weakly acidic while those with air masses from the northwest and the southwest were alkaline. SO(4)(2-), Ca(2+), NH(4)(+), and NO(3)(-) were dominant ions in the precipitation, accounting for 37%, 25%, 18%, and 9%, respectively, of the total analyzed ions. Ca(2+) and NH(4)(+) were found to be the major neutralizers of precipitation acidity; however, the contribution of Mg(2+), although much lower than those of Ca(2+) and NH(4)(+), was important, in many cases, in changing the precipitation from weakly acidic to weakly alkaline. Enrichment factor analysis confirmed that SO(4)(2-) and NO(3)(-) were produced from anthropogenic sources, Ca(2+), K(+), and 80% Mg(2+) were from crustal sources, and Na(+), Cl(-), and ∼20% of Mg(2+) were from marine sources. The annual wet depositions were estimated to be 3.5 t km(-2) per year for sulfur; 2.3 t km(-2) per year for nitrogen, of which 0.8 t km(-2) per year was oxidized nitrogen and 1.5 t km(-2) per year was reduced nitrogen; and 3.0 t km(-2) per year for Ca(2+).

DOI10.1039/c2em30457k
Indexed BySCI
Language英语
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10157
Collection粉尘与环境研究室
Corresponding AuthorShen, ZX (Shen, Zhenxing)[ 1,2 ]
Affiliation1.Department of Environmental Science and Engineering, Xi’an JiaotongUniversity, Xi’an 710049, China;
2.Key Laboratory of Aerosol, SKLLQG, Institute of Earth Environment,Chinese Academy of Sciences, Xi’an 710075, China;
3.Air Quality Research Division, Science and Technology Branch,Environment Canada, Toronto, Canada;
4.Key Laboratory of Regional Climate-Environment Research forTemperate East Asia, Institute of Atmospheric Physics, ChineseAcademy of Sciences, Beijing 100029, China
Recommended Citation
GB/T 7714
Shen, ZX ,Zhang, LM ,Cao, JJ ,et al. Chemical composition, sources, and deposition fluxes of water-soluble inorganic ions obtained from precipitation chemistry measurements collected at an urban site in northwest China[J]. Journal of Environmental Monitoring,2012,14(11):3000-3008.
APA Shen, ZX .,Zhang, LM .,Cao, JJ .,Tian, J .,Liu, L .,...&Liu, SX .(2012).Chemical composition, sources, and deposition fluxes of water-soluble inorganic ions obtained from precipitation chemistry measurements collected at an urban site in northwest China.Journal of Environmental Monitoring,14(11),3000-3008.
MLA Shen, ZX ,et al."Chemical composition, sources, and deposition fluxes of water-soluble inorganic ions obtained from precipitation chemistry measurements collected at an urban site in northwest China".Journal of Environmental Monitoring 14.11(2012):3000-3008.
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