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 PM2.5 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 NOx 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.
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