CHARACTERISTICS AND SOURCE ANALYSIS OF WATER-SOLUBLE ION POLLUTION IN ATMOSPHERIC DUSTFALL IN WUHAN UNIVERSITIES
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摘要: 于2017年11月采集武汉高校大气降尘样品106个,采用离子色谱仪分析样品中9种水溶性离子(F-、Cl-、NO3-、SO42-、Na+、NH4+、K+、Mg2+、Ca2+)的含量,用相关性分析和比值分析法解析其污染特征,用PCA-MLR模型初步探讨其来源及贡献率。结果表明:武汉高校降尘中主要水溶性离子为Ca2+、SO42-、NO3-,平均浓度顺序为Ca2+>SO42->NO3->K+>Na+>Cl->Mg2+>NH4+>F-,且F-、Cl-、NO3-、SO42-、Na+、K+、Mg2+、Ca2+分布存在明显的空间质异性。m(NO3-)/m(SO42-)为0.28,以固定源污染为主;降尘样品总体呈碱性。9种可溶性离子主要以NaCl、KCl、MgCl2、Mg(NO3)2、MgSO4、Ca(NO3)2、CaSO4等形式存在,主要来源于土壤/交通混合源、燃烧源、工业源,三者贡献率分别为8%、12%、80%。Abstract: There were 106 dustfall samples collected from Wuhan universities during November 2017. Nine types of water-soluble ions (F-, Cl-, NO3-, SO42-, Na+, NH4+, K+, Mg2+, Ca2+) were analyzed by ion chromatography. Correlation analysis and ratio analysis were used to analyze the pollution characteristics, and the PCA-MLR model was used to discuss its source and contribution rate. The results showed that the main water-soluble ions in dust reduction in Wuhan universities were Ca2+, SO42- and NO3-, and the average concentration order was Ca2+>SO42->NO3->K+>Na+>Cl->Mg2+>NH4+>F-. There were obvious spatial qualitative differences in the distribution of F-, Cl-, NO3-, SO42-, Na+, K+, Mg2+ and Ca2+. The mass ratio of NO3-/SO42- was 0.28, which was dominated by fixed-source pollution; the dust-reducing samples were generally alkaline. Nine types of soluble ions existed mainly in forms of NaCl, KCl, MgCl2, Mg (NO3)2, MgSO4, Ca(NO3)2, CaSO4, etc., mainly from soil/transport mixed sources, combustion sources, industrial source, and their contribution rates were 8%, 12% and 80%, respectively.
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Key words:
- universities /
- dustfall /
- water-soluble ions /
- pollution characteristics /
- sources
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