深圳冬季大气气态硝酸和硝酸盐气粒分配特征

陈瑶; 云龙; 罗遥; 牛英博; 彭杏; 何凌燕; 黄晓锋

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中国环境科学 ›› 2021, Vol. 41 ›› Issue (9) : 4036-4042.

大气污染与控制

深圳冬季大气气态硝酸和硝酸盐气粒分配特征

陈瑶¹, 云龙², 罗遥¹, 牛英博¹, 彭杏¹, 何凌燕¹, 黄晓锋¹

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Characteristics of gas-particle partitioning of gaseous nitric acid and particle nitrate in Shenzhen in winter

CHEN Yao¹, YUN Long², LUO Yao¹, NIU Ying-bo¹, PENG Xing¹, HE Ling-yan¹, HUANG Xiao-feng¹

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摘要

利用双通道在线气体和气溶胶分析仪（MARGA）在深圳冬季同时观测了PM_2.5和PM₁₀中水溶性无机离子及气态前体物浓度变化，以探究气态硝酸（HNO₃）和颗粒态硝酸盐（pNO₃^-）的气粒分配特征.结果表明，气态硝酸和颗粒态硝酸盐总和TNO₃（TNO₃=HNO₃+pNO₃^-）中，气态HNO₃、细颗粒NO₃^-和粗颗粒NO₃^-三个部分的占比分别为9.6%、56.8%和33.6%.TNO₃浓度日变化呈现双峰特征，上午峰值来自于细颗粒态NO₃^-增加，由交通早高峰排放NO_x转化生成所致；白天光化学反应使TNO₃的3个部分浓度均增加，TNO₃在下午17：00达到全天峰值.相关分析表明，低温有利于NO₃^-以NH₄NO₃存在于细颗粒态；TNO₃浓度较高时，细颗粒态NO₃^-占比亦升高.

Abstract

In this study, the dual-channel online gas and aerosol analyzer (MARGA) was used to simultaneously observe water-soluble inorganic ions and their gaseous precursors in PM_2.5 and PM₁₀ in Shenzhen in winter, in order to explore the gas-particle partitioning characteristic of gaseous nitric acid (HNO₃) and particle nitrate (pNO₃^-). It was shown that gaseous nitric acid, fine-particle nitrate and coarse-particle nitrate accounted for 9.6%, 56.8% and 33.6% of total nitrate (TNO₃,=HNO₃+ pNO₃^-), respectively. The diurnal variation of TNO₃ concentration presented a curve of two peaks. The peak in the morning was related to the increase of fine NO₃^- caused by NO_x from vehicles in the morning rush hour. The photochemical reaction in the daytime increased the concentration of three components of TNO₃, so the TNO₃ concentration reached the highest level of the day at 17:00. The analysis suggested that low temperature was beneficial for NO₃^- to exist in fine particles as NH₄NO₃. When the concentration of TNO₃ was high, the proportion of NO₃^- in fine particles also increased.

导出引用

陈瑶, 云龙, 罗遥, 牛英博, 彭杏, 何凌燕, 黄晓锋. 深圳冬季大气气态硝酸和硝酸盐气粒分配特征[J]. 中国环境科学. 2021, 41(9): 4036-4042

CHEN Yao, YUN Long, LUO Yao, NIU Ying-bo, PENG Xing, HE Ling-yan, HUANG Xiao-feng. Characteristics of gas-particle partitioning of gaseous nitric acid and particle nitrate in Shenzhen in winter[J]. China Environmental Science. 2021, 41(9): 4036-4042

中图分类号： X513

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