Concentrations and gas-particle partitioning of atmospheric reactive mercury at an urban site in Beijing, China
Concentrations and gas-particle partitioning of atmospheric reactive mercury at an urban site in Beijing, China
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中国北京某城区大气活性汞的浓度和气体颗粒分配
DOI：
10.1016/j.envpol.2019.02.064
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发表时间：
2019
影响因子：
8.9
通讯作者：
Zhang Xiaoshan
中科院分区：
文献类型：
--
作者：
Zhang Huan;Wang Zhangwei;Wang Chunjie;Zhang Xiaoshan
特定大气汞的测量在确定大气中汞的行为方面起着关键作用。在这项研究中，我们于2015年和2016年 在中国北京的一个城市站点测量了大气中特定的汞，包括气态元素汞（GEM）、活性气态汞（RGM）和颗粒结合汞（PBM）（<2.5 μm）。宝石的平均浓度,RGM PBM 4.70 ±3.53 ng m−3, 18.47±22.27 pg m−3和85.18 ±95.34 pg m−3,分别。pm2.5浓度对活性汞在气相和颗粒相之间的分布有显著影响。随着pm2.5浓度的升高，PBM浓度逐渐升高，RGM浓度逐渐降低。在空气污染事件期间，PBM的平均浓度是晴天的三倍多。在空气污染日，相对湿度显著影响活性汞的气粒分配。得到了气粒分配系数与气象因子（气温和相对湿度）的四季线性关系。数据还表明，活性汞的气粒分配系数与颗粒组成（如Cl−，BC）有关。本文的数据显示了人为排放对北京城区活性汞的影响。研究结果将有助于了解复杂城市污染中活性汞的气粒分布及其影响因素。
Measurements of speciated atmospheric mercury play a key role in identifying mercury behavior in the atmosphere. In this study, we measured speciated atmospheric mercury, including gaseous elemental mercury (GEM), reactive gaseous mercury (RGM), and particulate bound mercury (PBM) (<2.5 μm), in 2015 and 2016 at an urban site in Beijing, China. The mean concentrations of GEM, RGM, and PBM were 4.70 ± 3.53 ng m−3, 18.47 ± 22.27 pg m−3, and 85.18 ± 95.34 pg m−3, respectively. The concentration of PM2.5significantly affected the distribution of reactive mercury between the gaseous and particulate phases. With the raising of PM2.5levels, PBM concentrations increased, on the contrary, the concentrations of RGM decreased gradually. The mean concentration of PBM during air-pollution events was more than three times that during clear days. During days with air pollution, the relative humidity significantly affected the gas-particle partitioning of reactive mercury. The linear relationships between gas-particle partitioning coefficient and meteorological factors (air temperature and relative humidity) were obtained over the four seasons. The data also showed that the gas-particle partitioning coefficient of reactive mercury was related to particle composition (e.g., Cl−, BC). The data present in this paper suggested the influence of anthropogenic emissions on reactive mercury in Beijing urban. And the findings will contribute to understand the gas-particle partitioning of reactive mercury and its influencing factors with complex urban pollution.