北京初冬季PM2.5中无机元素与二次水溶性离子浓度特征
Characteristics of water-soluble inorganic ions and inorganic elements of PM2.5 in Beijing
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摘要: 为研究北京城区初冬季大气颗粒物中水溶性二次无机离子及元素的组成特征,2016年11月,利用青岛明华MH-16型PM2.5采样器在北京城区采样点进行大气颗粒物采样,样品采用离子色谱和电感耦合等离子体质谱分析.结果表明,NO3-、SO42-和NH4+在观测期间平均浓度分别为20.5±11.4 μg·m-3,13.4±12.1 μg·m-3和10.7±8.8 μg·m-3,SNA(sulfate、nitrate、ammonium)总浓度为44.6±45.2 μg·m-3.采样期间颗粒物中K、Fe、Na、Zn、Ca、Al、Mg及Pb元素的质量浓度比较高,占所分析元素总浓度的94.5%.采样期间Cr、Ni、Pb、Mn等元素的富集因子>10,Zn、Cu、As、Mo等元素的EF值超过100.Abstract: Particulate matters were sampled with a Qingdao Minghua MH-16 PM2.5 sampler to investigate the features of water-soluble inorganic ions and inorganic elements in Beijing. The water-soluble inorganic ions were analyzed by ions chromatography (IC), and inorganic elements were analyzed by Inductively coupled plasma mass spectrometry (ICP-MS). The analysis results showed that the concentrations of NO3-, SO42- and NH4+ were 20.5±11.4, 13.4±12.1 and 10.7±8.8 μg·m-3. Concentration of the total secondary water-soluble inorganic ions was 144.6±45.2 μg·m-3. Concentrations of K, Fe, Na, Zn, Ca, Al, Mg and Pb were high, which accounted for 5% of all the elements. The enrichment factor of Cr, Ni, Pb, Mn and other elements is greater than 10 during sampling, and that of the elements such as Zn, Cu, As and Mo exceeds 100.
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Key words:
- particulate matter /
- water-soluble inorganic ions /
- inorganic elements /
- Beijing
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