Measurement report: Oxidation potential of water-soluble aerosol components in the south and north of Beijing
<p>Water-soluble components significantly contribute to the oxidative potential (OP) of atmospheric fine particles (PM<span class="inline-formula"><sub>2.5</sub></span>), but our understanding of the water-soluble PM<span class="inline-formula">...
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| Language: | English |
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Copernicus Publications
2024-11-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/24/13219/2024/acp-24-13219-2024.pdf |
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| author | W. Yuan R.-J. Huang C. Luo L. Yang W. Cao J. Guo H. Yang |
| author_facet | W. Yuan R.-J. Huang C. Luo L. Yang W. Cao J. Guo H. Yang |
| author_sort | W. Yuan |
| collection | DOAJ |
| description | <p>Water-soluble components significantly contribute to the oxidative potential (OP) of atmospheric fine particles (PM<span class="inline-formula"><sub>2.5</sub></span>), but our understanding of the water-soluble PM<span class="inline-formula"><sub>2.5</sub></span> OP and its sources, as well as its relationship with water-soluble components, is still limited. In this study, the water-soluble OP levels in wintertime PM<span class="inline-formula"><sub>2.5</sub></span> in the south and north of Beijing, representing the difference in sources, were measured with the dithiothreitol (DTT) assay. The volume-normalized DTT (DTT<span class="inline-formula"><sub>v</sub></span>) in the north (<span class="inline-formula">3.5±1.2</span> nmol min<span class="inline-formula"><sup>−1</sup></span> m<span class="inline-formula"><sup>−3</sup></span>) was comparable to that in the south (<span class="inline-formula">3.9±0.9</span> nmol min<span class="inline-formula"><sup>−1</sup></span> m<span class="inline-formula"><sup>−3</sup></span>), while the mass-normalized DTT (DTT<span class="inline-formula"><sub>m</sub></span>) in the north (<span class="inline-formula">65±28</span> pmol min<span class="inline-formula"><sup>−1</sup></span> <span class="inline-formula">µ</span>g<span class="inline-formula"><sup>−3</sup></span>) was almost twice that in the south (<span class="inline-formula">36±14</span> pmol min<span class="inline-formula"><sup>−1</sup></span> <span class="inline-formula">µ</span>g<span class="inline-formula"><sup>−3</sup></span>). In both the south and north of Beijing, DTT<span class="inline-formula"><sub>v</sub></span> was better correlated with soluble elements instead of total elements. In the north, soluble elements (mainly Mn, Co, Ni, Zn, As, Cd and Pb) and water-soluble organic compounds, especially light-absorbing compounds (also known as brown carbon), had positive correlations with DTT<span class="inline-formula"><sub>v</sub></span>. However, in the south, DTT<span class="inline-formula"><sub>v</sub></span> was mainly related to soluble As, Fe and Pb. The sources of DTT<span class="inline-formula"><sub>v</sub></span> were further resolved using the positive matrix factorization (PMF) model. Traffic-related emissions (39 %) and biomass burning (25 %) were the main sources of DTT<span class="inline-formula"><sub>v</sub></span> in the south, and traffic-related emissions (<span class="inline-formula">>50 <i>%</i></span>) contributed the most to DTT<span class="inline-formula"><sub>v</sub></span> in the north. Our results indicate that vehicle emission was an important contributor to the OP in Beijing ambient PM<span class="inline-formula"><sub>2.5</sub></span> and suggest that more study is needed to understand the intrinsic relationship between the OP and light-absorbing organic compounds.</p> |
| format | Article |
| id | doaj-art-faabcc8257a143f483f251176d6fab64 |
| institution | Kabale University |
| issn | 1680-7316 1680-7324 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj-art-faabcc8257a143f483f251176d6fab642024-11-29T11:15:29ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242024-11-0124132191323010.5194/acp-24-13219-2024Measurement report: Oxidation potential of water-soluble aerosol components in the south and north of BeijingW. Yuan0R.-J. Huang1C. Luo2L. Yang3W. Cao4J. Guo5H. Yang6State Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaState Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaSchool of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaState Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaState Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaState Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaSchool of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China<p>Water-soluble components significantly contribute to the oxidative potential (OP) of atmospheric fine particles (PM<span class="inline-formula"><sub>2.5</sub></span>), but our understanding of the water-soluble PM<span class="inline-formula"><sub>2.5</sub></span> OP and its sources, as well as its relationship with water-soluble components, is still limited. In this study, the water-soluble OP levels in wintertime PM<span class="inline-formula"><sub>2.5</sub></span> in the south and north of Beijing, representing the difference in sources, were measured with the dithiothreitol (DTT) assay. The volume-normalized DTT (DTT<span class="inline-formula"><sub>v</sub></span>) in the north (<span class="inline-formula">3.5±1.2</span> nmol min<span class="inline-formula"><sup>−1</sup></span> m<span class="inline-formula"><sup>−3</sup></span>) was comparable to that in the south (<span class="inline-formula">3.9±0.9</span> nmol min<span class="inline-formula"><sup>−1</sup></span> m<span class="inline-formula"><sup>−3</sup></span>), while the mass-normalized DTT (DTT<span class="inline-formula"><sub>m</sub></span>) in the north (<span class="inline-formula">65±28</span> pmol min<span class="inline-formula"><sup>−1</sup></span> <span class="inline-formula">µ</span>g<span class="inline-formula"><sup>−3</sup></span>) was almost twice that in the south (<span class="inline-formula">36±14</span> pmol min<span class="inline-formula"><sup>−1</sup></span> <span class="inline-formula">µ</span>g<span class="inline-formula"><sup>−3</sup></span>). In both the south and north of Beijing, DTT<span class="inline-formula"><sub>v</sub></span> was better correlated with soluble elements instead of total elements. In the north, soluble elements (mainly Mn, Co, Ni, Zn, As, Cd and Pb) and water-soluble organic compounds, especially light-absorbing compounds (also known as brown carbon), had positive correlations with DTT<span class="inline-formula"><sub>v</sub></span>. However, in the south, DTT<span class="inline-formula"><sub>v</sub></span> was mainly related to soluble As, Fe and Pb. The sources of DTT<span class="inline-formula"><sub>v</sub></span> were further resolved using the positive matrix factorization (PMF) model. Traffic-related emissions (39 %) and biomass burning (25 %) were the main sources of DTT<span class="inline-formula"><sub>v</sub></span> in the south, and traffic-related emissions (<span class="inline-formula">>50 <i>%</i></span>) contributed the most to DTT<span class="inline-formula"><sub>v</sub></span> in the north. Our results indicate that vehicle emission was an important contributor to the OP in Beijing ambient PM<span class="inline-formula"><sub>2.5</sub></span> and suggest that more study is needed to understand the intrinsic relationship between the OP and light-absorbing organic compounds.</p>https://acp.copernicus.org/articles/24/13219/2024/acp-24-13219-2024.pdf |
| spellingShingle | W. Yuan R.-J. Huang C. Luo L. Yang W. Cao J. Guo H. Yang Measurement report: Oxidation potential of water-soluble aerosol components in the south and north of Beijing Atmospheric Chemistry and Physics |
| title | Measurement report: Oxidation potential of water-soluble aerosol components in the south and north of Beijing |
| title_full | Measurement report: Oxidation potential of water-soluble aerosol components in the south and north of Beijing |
| title_fullStr | Measurement report: Oxidation potential of water-soluble aerosol components in the south and north of Beijing |
| title_full_unstemmed | Measurement report: Oxidation potential of water-soluble aerosol components in the south and north of Beijing |
| title_short | Measurement report: Oxidation potential of water-soluble aerosol components in the south and north of Beijing |
| title_sort | measurement report oxidation potential of water soluble aerosol components in the south and north of beijing |
| url | https://acp.copernicus.org/articles/24/13219/2024/acp-24-13219-2024.pdf |
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