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首页> 外文期刊>Journal of environmental sciences >Observation of chemical components of PM2.5 and secondary inorganic aerosol formation during haze and sandy haze days in Zhengzhou, China
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Observation of chemical components of PM2.5 and secondary inorganic aerosol formation during haze and sandy haze days in Zhengzhou, China

机译：中国郑州雾霾与砂岩霾天中PM2.5和二次无机气雾醇形成化学成分的观察

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Mineral dust particles play an important role in the formation of secondary inorganic aerosols, which largely contribute to haze pollution in China. During this study, a haze episode (haze days) and a typical haze process mixed with sandstorm (sandy haze days) were observed in Zhengzhou with a series of high-time-resolution monitoring instruments from November 22 to December 8, 2018. Concentrations of PM10 and crustal elements clearly increased in the sandy haze days. Concentrations of gaseous pollutants, metallic elements emitted from anthropogenic sources, nitrate, and ammonium during sandy haze days were slightly lower than those during the haze days but still obviously higher than those during the non-haze days. The sulfate concentrations, the sulfate fractions in PM2.5, and the sulfur oxidation ratios significantly increased in the sandy haze days. Heterogeneous reactions dominated the conversion of SO2 during the haze and sandy haze days. Enhanced SO2 conversion during the sandy haze days may be attributed to the high concentrations of transition metal ions from the sandstorm when the values of relative humidity (RH) were in 30%-70%, and high O-3 at certain time points. Gas-phase NO2 oxidation reactions were the main pathways for nitrate formation. In the sandy haze days, higher nitrogen oxidation ratio (NOR) at daytime may be associated with higher RH and lower temperature than those in the haze days, which facilitate the gas-to-particle partitioning of nitrate; higher NOR values at night may be attributed to the higher O-3 concentrations, which promoted the formation of N2O5. (C) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
机译：矿物粉尘颗粒在次级无机气溶胶形成中发挥着重要作用，这主要有助于中国的阴霾污染。在这项研究期间，在郑州观察了雾霾集团（阴霾天）和与沙尘暴（桑迪阴霾天）混合的典型阴霾过程，于2018年11月22日至12月8日的一系列高度分辨率监测仪器。 PM10和地壳元素在桑迪阴霾的日子里明显增加。气态污染物的浓度，在桑迪源，硝酸盐中发出的金属元素，含有硝酸盐的天数，略微低于阴霾天期间，但仍明显高于非雾度天期间的金属元素。硫酸盐浓度，pM2.5中的硫酸盐级分，含有含有含有含有含硫雾度的硫酸盐级数。异质反应在雾度和桑迪阴霾天期间主导了SO2的转化。当相对湿度（RH）的值为30％-70％，在一定时间点时，桑迪雾度天期间的增强的SO2转换可能归因于来自沙尘暴的高浓度过渡金属离子。气相NO2氧化反应是硝酸盐形成的主要途径。在桑迪阴霾的日子中，白天在白天的氮氧化比（也不是）与较高的RH和较低的温度相关，其促进硝酸盐的气体到颗粒分配;夜间的更高或更高的值可能归因于较高的O-3浓度，其促进了N2O5的形成。 （c）2019中国科学院生态环境科学研究中心。 elsevier b.v出版。

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