The isotopic patterns and source apportionment of nitrate and ammonium in atmospheric aerosol

Nitrate (NO3-) and ammonium (NH4+) are the major components in inorganic aerosol. However, their sources and formation processes remain unclear. This study conducted a year-round field measurement of TSP, PM2.5 and PM1.0 in five different sites in the Beijing-Tianjin-Hebei (BTH) region to determine...

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Published inThe Science of the total environment Vol. 803; p. 149559
Main Authors Dong, Xinyuan, Guo, Qingjun, Han, Xiaokun, Wei, Rongfei, Tao, Zhenghua
Format Journal Article
LanguageEnglish
Published Elsevier B.V 10.01.2022
Subjects
aerosols
air
ammonium
ammonium nitrate
biomass
China
dissociation
dust
environment
Formation processes
fossil fuels
fuel combustion
Inorganic nitrogen
Isotopes
Meteorological conditions
nitrogen
pollution
Regional migration
relative humidity
soil
solar radiation
Source apportionment
spring
summer
temperature
volatilization
water solubility
winter
China
Regional migration
Inorganic nitrogen
Isotopes
Source apportionment
Formation processes
Meteorological conditions
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Abstract Nitrate (NO3-) and ammonium (NH4+) are the major components in inorganic aerosol. However, their sources and formation processes remain unclear. This study conducted a year-round field measurement of TSP, PM2.5 and PM1.0 in five different sites in the Beijing-Tianjin-Hebei (BTH) region to determine the concentrations of water-soluble inorganic ions (WSIIs) and the isotopic compositions of inorganic nitrogen (δ15N-NH4+, δ15N-NO3-, and δ18O-NO3-). The results showed the highest concentration of WSIIs in winter and lowest in summer. δ15N-NO3-, δ18O-NO3-, and δ15N-NH4+ were in the range of -6.1–18.2, 52.2–103.8, and -28.7–36.2‰, respectively. The seasonal variations of δ15N-NO3- and δ15N-NH4+ were an indication of relative contributions of the main sources and effects of meteorological conditions. The source apportionment identified fossil fuel combustion (38.2–50.6%), agricultural emissions (18–24.7%), biomass burning (16.3–22.7%), and road dust/soil (8.7–23.4%) were the main sources of inorganic aerosols. The local sources and regional migration contributed to the level of inorganic aerosol pollution. In winter, the aerosol in the BTH region was affected by the air mass from the northwest. While in spring and summer, the air mass was mainly from the South China. The low temperature and high relative humidity favored to the formation of inorganic nitrogen aerosol, and solar radiation affected the formation processes of inorganic aerosols by changing the oxidation pathway of NO3- and accelerating the volatilization and dissociation of ammonium nitrate (NH4NO3). This study discovered the main source contributions of inorganic nitrogen aerosol using N and O isotopes composition, and the obtained information has a great importance in understanding the effects of meteorological conditions on formation and the contribution of regional transport. [Display omitted] •Isotopic patterns of inorganic nitrogen aerosol in the BTH region were reported.•Fossil fuel combustion accounted for 38.2– 50.6% of inorganic nitrogen aerosol.•Meteorological conditions played a vital role on formation processes.•The regional migration was from the northwest in winter, while south in summer.
AbstractList Nitrate (NO₃⁻) and ammonium (NH₄⁺) are the major components in inorganic aerosol. However, their sources and formation processes remain unclear. This study conducted a year-round field measurement of TSP, PM₂.₅ and PM₁.₀ in five different sites in the Beijing-Tianjin-Hebei (BTH) region to determine the concentrations of water-soluble inorganic ions (WSIIs) and the isotopic compositions of inorganic nitrogen (δ¹⁵N-NH₄⁺, δ¹⁵N-NO₃⁻, and δ¹⁸O-NO₃⁻). The results showed the highest concentration of WSIIs in winter and lowest in summer. δ¹⁵N-NO₃⁻, δ¹⁸O-NO₃⁻, and δ¹⁵N-NH₄⁺ were in the range of -6.1–18.2, 52.2–103.8, and -28.7–36.2‰, respectively. The seasonal variations of δ¹⁵N-NO₃⁻ and δ¹⁵N-NH₄⁺ were an indication of relative contributions of the main sources and effects of meteorological conditions. The source apportionment identified fossil fuel combustion (38.2–50.6%), agricultural emissions (18–24.7%), biomass burning (16.3–22.7%), and road dust/soil (8.7–23.4%) were the main sources of inorganic aerosols. The local sources and regional migration contributed to the level of inorganic aerosol pollution. In winter, the aerosol in the BTH region was affected by the air mass from the northwest. While in spring and summer, the air mass was mainly from the South China. The low temperature and high relative humidity favored to the formation of inorganic nitrogen aerosol, and solar radiation affected the formation processes of inorganic aerosols by changing the oxidation pathway of NO₃⁻ and accelerating the volatilization and dissociation of ammonium nitrate (NH₄NO₃). This study discovered the main source contributions of inorganic nitrogen aerosol using N and O isotopes composition, and the obtained information has a great importance in understanding the effects of meteorological conditions on formation and the contribution of regional transport.
Nitrate (NO3-) and ammonium (NH4+) are the major components in inorganic aerosol. However, their sources and formation processes remain unclear. This study conducted a year-round field measurement of TSP, PM2.5 and PM1.0 in five different sites in the Beijing-Tianjin-Hebei (BTH) region to determine the concentrations of water-soluble inorganic ions (WSIIs) and the isotopic compositions of inorganic nitrogen (δ15N-NH4+, δ15N-NO3-, and δ18O-NO3-). The results showed the highest concentration of WSIIs in winter and lowest in summer. δ15N-NO3-, δ18O-NO3-, and δ15N-NH4+ were in the range of -6.1-18.2, 52.2-103.8, and -28.7-36.2‰, respectively. The seasonal variations of δ15N-NO3- and δ15N-NH4+ were an indication of relative contributions of the main sources and effects of meteorological conditions. The source apportionment identified fossil fuel combustion (38.2-50.6%), agricultural emissions (18-24.7%), biomass burning (16.3-22.7%), and road dust/soil (8.7-23.4%) were the main sources of inorganic aerosols. The local sources and regional migration contributed to the level of inorganic aerosol pollution. In winter, the aerosol in the BTH region was affected by the air mass from the northwest. While in spring and summer, the air mass was mainly from the South China. The low temperature and high relative humidity favored to the formation of inorganic nitrogen aerosol, and solar radiation affected the formation processes of inorganic aerosols by changing the oxidation pathway of NO3- and accelerating the volatilization and dissociation of ammonium nitrate (NH4NO3). This study discovered the main source contributions of inorganic nitrogen aerosol using N and O isotopes composition, and the obtained information has a great importance in understanding the effects of meteorological conditions on formation and the contribution of regional transport.Nitrate (NO3-) and ammonium (NH4+) are the major components in inorganic aerosol. However, their sources and formation processes remain unclear. This study conducted a year-round field measurement of TSP, PM2.5 and PM1.0 in five different sites in the Beijing-Tianjin-Hebei (BTH) region to determine the concentrations of water-soluble inorganic ions (WSIIs) and the isotopic compositions of inorganic nitrogen (δ15N-NH4+, δ15N-NO3-, and δ18O-NO3-). The results showed the highest concentration of WSIIs in winter and lowest in summer. δ15N-NO3-, δ18O-NO3-, and δ15N-NH4+ were in the range of -6.1-18.2, 52.2-103.8, and -28.7-36.2‰, respectively. The seasonal variations of δ15N-NO3- and δ15N-NH4+ were an indication of relative contributions of the main sources and effects of meteorological conditions. The source apportionment identified fossil fuel combustion (38.2-50.6%), agricultural emissions (18-24.7%), biomass burning (16.3-22.7%), and road dust/soil (8.7-23.4%) were the main sources of inorganic aerosols. The local sources and regional migration contributed to the level of inorganic aerosol pollution. In winter, the aerosol in the BTH region was affected by the air mass from the northwest. While in spring and summer, the air mass was mainly from the South China. The low temperature and high relative humidity favored to the formation of inorganic nitrogen aerosol, and solar radiation affected the formation processes of inorganic aerosols by changing the oxidation pathway of NO3- and accelerating the volatilization and dissociation of ammonium nitrate (NH4NO3). This study discovered the main source contributions of inorganic nitrogen aerosol using N and O isotopes composition, and the obtained information has a great importance in understanding the effects of meteorological conditions on formation and the contribution of regional transport.
Nitrate (NO3-) and ammonium (NH4+) are the major components in inorganic aerosol. However, their sources and formation processes remain unclear. This study conducted a year-round field measurement of TSP, PM2.5 and PM1.0 in five different sites in the Beijing-Tianjin-Hebei (BTH) region to determine the concentrations of water-soluble inorganic ions (WSIIs) and the isotopic compositions of inorganic nitrogen (δ15N-NH4+, δ15N-NO3-, and δ18O-NO3-). The results showed the highest concentration of WSIIs in winter and lowest in summer. δ15N-NO3-, δ18O-NO3-, and δ15N-NH4+ were in the range of -6.1–18.2, 52.2–103.8, and -28.7–36.2‰, respectively. The seasonal variations of δ15N-NO3- and δ15N-NH4+ were an indication of relative contributions of the main sources and effects of meteorological conditions. The source apportionment identified fossil fuel combustion (38.2–50.6%), agricultural emissions (18–24.7%), biomass burning (16.3–22.7%), and road dust/soil (8.7–23.4%) were the main sources of inorganic aerosols. The local sources and regional migration contributed to the level of inorganic aerosol pollution. In winter, the aerosol in the BTH region was affected by the air mass from the northwest. While in spring and summer, the air mass was mainly from the South China. The low temperature and high relative humidity favored to the formation of inorganic nitrogen aerosol, and solar radiation affected the formation processes of inorganic aerosols by changing the oxidation pathway of NO3- and accelerating the volatilization and dissociation of ammonium nitrate (NH4NO3). This study discovered the main source contributions of inorganic nitrogen aerosol using N and O isotopes composition, and the obtained information has a great importance in understanding the effects of meteorological conditions on formation and the contribution of regional transport. [Display omitted] •Isotopic patterns of inorganic nitrogen aerosol in the BTH region were reported.•Fossil fuel combustion accounted for 38.2– 50.6% of inorganic nitrogen aerosol.•Meteorological conditions played a vital role on formation processes.•The regional migration was from the northwest in winter, while south in summer.
ArticleNumber 149559
Author Dong, Xinyuan
Guo, Qingjun
Tao, Zhenghua
Wei, Rongfei
Han, Xiaokun
Author_xml – sequence: 1
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  surname: Dong
  fullname: Dong, Xinyuan
  organization: Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
– sequence: 2
  givenname: Qingjun
  surname: Guo
  fullname: Guo, Qingjun
  email: guoqj@igsnrr.ac.cn
  organization: Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
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  givenname: Xiaokun
  surname: Han
  fullname: Han, Xiaokun
  organization: Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China
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  givenname: Rongfei
  surname: Wei
  fullname: Wei, Rongfei
  organization: Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
– sequence: 5
  givenname: Zhenghua
  surname: Tao
  fullname: Tao, Zhenghua
  organization: Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
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Keywords Regional migration
Inorganic nitrogen
Isotopes
Source apportionment
Formation processes
Meteorological conditions
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Snippet Nitrate (NO3-) and ammonium (NH4+) are the major components in inorganic aerosol. However, their sources and formation processes remain unclear. This study...
Nitrate (NO₃⁻) and ammonium (NH₄⁺) are the major components in inorganic aerosol. However, their sources and formation processes remain unclear. This study...
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SubjectTerms aerosols
air
ammonium
ammonium nitrate
biomass
China
dissociation
dust
environment
Formation processes
fossil fuels
fuel combustion
Inorganic nitrogen
Isotopes
Meteorological conditions
nitrogen
pollution
Regional migration
relative humidity
soil
solar radiation
Source apportionment
spring
summer
temperature
volatilization
water solubility
winter
Title The isotopic patterns and source apportionment of nitrate and ammonium in atmospheric aerosol
URI https://dx.doi.org/10.1016/j.scitotenv.2021.149559
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https://www.proquest.com/docview/2636523947
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