Size-segregated Characteristics and Formation Mechanisms of Water-soluble Inorganic Ions during Different Seasons in Heshan of Guangdong, China
Abstract To identify the characteristics, sources, and formation mechanisms of aerosol particles during pollution episodes in the Pearl River Delta, 24 sets of size-segregated samples were collected in Heshan during July 2014 and January 2015 using a 10-stage Micro-Orifice Uniform Deposit Impactor (...
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| Format: | Article |
| Language: | English |
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Springer
2020-05-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.2019.11.0582 |
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| author | Bo Huang Ting Gan Chenglei Pei Mei Li Peng Cheng Duohong Chen Ridong Cai Yujun Wang Lei Li Zhengxu Huang Wei Gao Zhong Fu Zhen Zhou |
| author_facet | Bo Huang Ting Gan Chenglei Pei Mei Li Peng Cheng Duohong Chen Ridong Cai Yujun Wang Lei Li Zhengxu Huang Wei Gao Zhong Fu Zhen Zhou |
| author_sort | Bo Huang |
| collection | DOAJ |
| description | Abstract To identify the characteristics, sources, and formation mechanisms of aerosol particles during pollution episodes in the Pearl River Delta, 24 sets of size-segregated samples were collected in Heshan during July 2014 and January 2015 using a 10-stage Micro-Orifice Uniform Deposit Impactor (MOUDI), and nine ions, viz., Na+, NH4+, K+, Mg2+, Ca2+, Cl−, NO2−, NO3−, and SO42−, were investigated. The Na+, Mg2+, and Ca2+ were mainly distributed in the coarse particles, and were mainly from soil, dust, and sea salt. The fine-mode K+ during winter was mostly generated by biomass burning. The coarse-mode Cl− originated from sea salt, whereas the fine-mode Cl− resulted from the conversion of NH4Cl to the particle phase. Both the SO42− and the NO3− exhibited unimodal distributions during winter but bimodal ones during summer. The coarse-mode SO42− and NO3− arose from sea salt and heterogeneous reactions, respectively. An increase in the nitrogen oxidation ratio (NOR) and a decrease in the sulfur oxidation ratio (SOR) were observed on polluted days, with the highest values occurring in the 0.56–1 µm particle size fraction. The formation of NO3− was chiefly related toµ homogeneous gas-phase reactions during winter and nocturnal heterogeneous reactions involving N2O5 during summer, whereas the formation of SO42− was driven by gas-phase oxidation in the 0.056–0.32 µm size range and aqueous oxidation in the 0.56–3.2 µm range. Additionally, the SOR and the NO2 concentration displayed a positive correlation in the 0.056–1.8 µm particle size fraction, indicating that the potential formation of SO42− via aqueous reactions was accelerated by NO2. |
| format | Article |
| id | doaj-art-7fdf1074a7584278940bcb4a9b53ee3f |
| institution | Kabale University |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2020-05-01 |
| publisher | Springer |
| record_format | Article |
| series | Aerosol and Air Quality Research |
| spelling | doaj-art-7fdf1074a7584278940bcb4a9b53ee3f2025-02-09T12:19:35ZengSpringerAerosol and Air Quality Research1680-85842071-14092020-05-012091961197310.4209/aaqr.2019.11.0582Size-segregated Characteristics and Formation Mechanisms of Water-soluble Inorganic Ions during Different Seasons in Heshan of Guangdong, ChinaBo Huang0Ting Gan1Chenglei Pei2Mei Li3Peng Cheng4Duohong Chen5Ridong Cai6Yujun Wang7Lei Li8Zhengxu Huang9Wei Gao10Zhong Fu11Zhen Zhou12Institute of Mass Spectrometer and Atmospheric Environment, Jinan UniversitySun Yat-sen UniversityGuangzhou Environmental Monitoring CenterInstitute of Mass Spectrometer and Atmospheric Environment, Jinan UniversityInstitute of Mass Spectrometer and Atmospheric Environment, Jinan UniversityGuangdong Environmental Monitoring CenterGuangdong Environmental Monitoring CenterGuangzhou Environmental Monitoring CenterInstitute of Mass Spectrometer and Atmospheric Environment, Jinan UniversityInstitute of Mass Spectrometer and Atmospheric Environment, Jinan UniversityInstitute of Mass Spectrometer and Atmospheric Environment, Jinan UniversityGuangzhou Hexin Instrument Co., LtdInstitute of Mass Spectrometer and Atmospheric Environment, Jinan UniversityAbstract To identify the characteristics, sources, and formation mechanisms of aerosol particles during pollution episodes in the Pearl River Delta, 24 sets of size-segregated samples were collected in Heshan during July 2014 and January 2015 using a 10-stage Micro-Orifice Uniform Deposit Impactor (MOUDI), and nine ions, viz., Na+, NH4+, K+, Mg2+, Ca2+, Cl−, NO2−, NO3−, and SO42−, were investigated. The Na+, Mg2+, and Ca2+ were mainly distributed in the coarse particles, and were mainly from soil, dust, and sea salt. The fine-mode K+ during winter was mostly generated by biomass burning. The coarse-mode Cl− originated from sea salt, whereas the fine-mode Cl− resulted from the conversion of NH4Cl to the particle phase. Both the SO42− and the NO3− exhibited unimodal distributions during winter but bimodal ones during summer. The coarse-mode SO42− and NO3− arose from sea salt and heterogeneous reactions, respectively. An increase in the nitrogen oxidation ratio (NOR) and a decrease in the sulfur oxidation ratio (SOR) were observed on polluted days, with the highest values occurring in the 0.56–1 µm particle size fraction. The formation of NO3− was chiefly related toµ homogeneous gas-phase reactions during winter and nocturnal heterogeneous reactions involving N2O5 during summer, whereas the formation of SO42− was driven by gas-phase oxidation in the 0.056–0.32 µm size range and aqueous oxidation in the 0.56–3.2 µm range. Additionally, the SOR and the NO2 concentration displayed a positive correlation in the 0.056–1.8 µm particle size fraction, indicating that the potential formation of SO42− via aqueous reactions was accelerated by NO2.https://doi.org/10.4209/aaqr.2019.11.0582Water-soluble inorganic ionsSize distributionSecondary formationSORNOR |
| spellingShingle | Bo Huang Ting Gan Chenglei Pei Mei Li Peng Cheng Duohong Chen Ridong Cai Yujun Wang Lei Li Zhengxu Huang Wei Gao Zhong Fu Zhen Zhou Size-segregated Characteristics and Formation Mechanisms of Water-soluble Inorganic Ions during Different Seasons in Heshan of Guangdong, China Aerosol and Air Quality Research Water-soluble inorganic ions Size distribution Secondary formation SOR NOR |
| title | Size-segregated Characteristics and Formation Mechanisms of Water-soluble Inorganic Ions during Different Seasons in Heshan of Guangdong, China |
| title_full | Size-segregated Characteristics and Formation Mechanisms of Water-soluble Inorganic Ions during Different Seasons in Heshan of Guangdong, China |
| title_fullStr | Size-segregated Characteristics and Formation Mechanisms of Water-soluble Inorganic Ions during Different Seasons in Heshan of Guangdong, China |
| title_full_unstemmed | Size-segregated Characteristics and Formation Mechanisms of Water-soluble Inorganic Ions during Different Seasons in Heshan of Guangdong, China |
| title_short | Size-segregated Characteristics and Formation Mechanisms of Water-soluble Inorganic Ions during Different Seasons in Heshan of Guangdong, China |
| title_sort | size segregated characteristics and formation mechanisms of water soluble inorganic ions during different seasons in heshan of guangdong china |
| topic | Water-soluble inorganic ions Size distribution Secondary formation SOR NOR |
| url | https://doi.org/10.4209/aaqr.2019.11.0582 |
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