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Different roles of nitrate and sulfate in air pollution episodes in the North China Plain
Atmospheric Environment ( IF 5 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.atmosenv.2020.117325
Yinghong Wang , Guiqian Tang , Wei Zhao , Yang Yang , Lili Wang , Zirui Liu , Tianxue Wen , Mengtian Cheng , Yiming Wang , Yuesi Wang

Abstract Different chemical substances make different contributions to particles with different diameters. It is important to determine which species play important roles to control air pollution. In this study, the concentrations of water-soluble inorganic ions, elemental carbon, organic carbon and metal elements in PM1 (particulate matter with a diameter less than 1 μm) and PM2.5 (particulate matter with a diameter less than 2.5 μm) in the Shijiazhuang suburban area were measured by synchronous sampling for one month in the summer of 2016. The results showed that the chemical components of particulate matter are mainly SO42−, NO3−, NH4+ and organic matter (OM), accounting for 14%, 8%, 11%, and 11%, respectively, in PM1 and 13%, 8%, 10%, and 9%, respectively, in PM2.5. PM1 and PM2.5 have similar sources, including secondary nitrate, secondary sulfate, industrial sources, motor vehicle sources, dust, biomass combustion and coal burning, which contribute 29%, 30%, 10%, 9%, 8%, 8% and 6%, respectively, to PM1 and 29%, 33%, 12%, 13%, 8%, 2%, and 4%, respectively, to PM2.5. Based on the analysis of a typical pollution episode, the concentrations of PM1 and PM2.5 increase synchronously in the explosive growth stage, with nitrate acting as the key chemical component. In the most polluted period, the concentration of PM2.5 continues to increase because of the increase in sulfate, while that of PM1 is almost constant. The results show that the prevention and control of PM1 and PM2.5 should be different in different pollution stages.

中文翻译:

硝酸盐和硫酸盐在华北平原空气污染事件中的不同作用

摘要 不同的化学物质对不同直径的粒子有不同的贡献。确定哪些物种在控制空气污染方面发挥重要作用非常重要。本研究中,PM1(直径小于1 μm的颗粒物)和PM2.5(直径小于2.5 μm的颗粒物)中水溶性无机离子、元素碳、有机碳和金属元素的浓度2016年夏季对石家庄郊区进行了1个月的同步采样测量,结果表明颗粒物化学成分主要为SO42-、NO3-、NH4+和有机物(OM),占14%、8 PM1 中分别为 %、11% 和 11%,PM2.5 中分别为 13%、8%、10% 和 9%。PM1 和 PM2.5 的来源相似,包括二次硝酸盐、二次硫酸盐、工业源、机动车源、粉尘、生物质燃烧和燃煤,对 PM1 的贡献率分别为 29%、30%、10%、9%、8%、8% 和 6%,对 PM1 的贡献率分别为 29%、33 %、12%、13%、8%、2% 和 4%,分别为 PM2.5。通过对一次典型污染事件的分析,PM1和PM2.5浓度在爆发性增长阶段同步增加,其中硝酸盐是关键化学成分。在污染最严重的时期,由于硫酸盐的增加,PM2.5的浓度继续增加,而PM1的浓度几乎不变。结果表明,不同污染阶段对PM1和PM2.5的防治应有所不同。PM1 和 PM2.5 的 29%、33%、12%、13%、8%、2% 和 4%。通过对一次典型污染事件的分析,PM1和PM2.5浓度在爆发性增长阶段同步增加,其中硝酸盐是关键化学成分。在污染最严重的时期,由于硫酸盐的增加,PM2.5的浓度继续增加,而PM1的浓度几乎不变。结果表明,不同污染阶段对PM1和PM2.5的防治应有所不同。PM1 和 PM2.5 的 29%、33%、12%、13%、8%、2% 和 4%。通过对一次典型污染事件的分析,PM1和PM2.5浓度在爆发性增长阶段同步增加,其中硝酸盐是关键化学成分。在污染最严重的时期,由于硫酸盐的增加,PM2.5的浓度继续增加,而PM1的浓度几乎不变。结果表明,不同污染阶段对PM1和PM2.5的防治应有所不同。5由于硫酸盐的增加而继续增加,而PM1的几乎不变。结果表明,不同污染阶段对PM1和PM2.5的防治应有所不同。5由于硫酸盐的增加而继续增加,而PM1的几乎不变。结果表明,不同污染阶段对PM1和PM2.5的防治应有所不同。
更新日期:2020-03-01
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