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We recently reported a novel pathway for the heterogeneous oxidation of SO2 by in-particle oxidants (OH, NO2, and NO2\u2013\/HNO2) produced from particulate nitrate photolysis (Environ. Sci. Technol.\u00a02019, 53, 8757\u20138766). Particulate nitrate is often found to coexist with chloride and other halide ions, especially in aged sea-salt aerosols and combustion aerosols. Reactive uptake experiments of SO2 with UV-irradiated nitrate particles showed that sulfate production rates were enhanced by a factor of 1.4, 1.3, and 2.0 in the presence of Cl\u2013, Br\u2013, and I\u2013, respectively, compared to those in the absence of halide ions. The larger sulfate production was attributed to enhanced nitrate photolysis promoted by the increased incomplete solvation of nitrate at the air\u2013particle interface due to the presence of surface-active halide ions. Modeling results based on the experimental data showed that the nitrate photolysis rate constants increased by a factor of 2.0, 1.7, and 3.7 in the presence of Cl\u2013, Br\u2013, and I\u2013, respectively. A linear relation was found between the nitrate photolysis rate constant, jNO3\u2011, and the initial molar ratio of Cl\u2013 to NO3\u2013, [Cl\u2013]0\/[NO3\u2013]0, as jNO3\u2011 = 9.7 \u00d7 10\u20135[Cl\u2013]0\/[NO3\u2013]0 + 1.9 \u00d7 10\u20135 at [Cl\u2013]0\/[NO3\u2013]0 below 0.2. The present study demonstrates that the presence of halide ions enhances sulfate production produced during particulate nitrate photolysis and provides insights into the enhanced formation of in-particle oxidants that may increase atmospheric oxidative capacity.<\/jats:p>","DOI":"10.1021\/acs.est.9b06445","type":"journal-article","created":{"date-parts":[[2020,3,3]],"date-time":"2020-03-03T22:53:52Z","timestamp":1583276032000},"page":"3831-3839","source":"Crossref","is-referenced-by-count":72,"title":["Enhanced\nSulfate Production by Nitrate Photolysis\nin the Presence of Halide Ions in Atmospheric Particles"],"prefix":"10.1021","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2361-1990","authenticated-orcid":true,"given":"Ruifeng","family":"Zhang","sequence":"first","affiliation":[{"name":"City University of Hong Kong , , Tat Chee Avenue , , ,","place":["Kowloon, Hong Kong, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6160-9029","authenticated-orcid":true,"given":"Masao","family":"Gen","sequence":"additional","affiliation":[{"name":"City University of Hong Kong , , Tat Chee Avenue , , ,","place":["Kowloon, Hong Kong, China"]},{"name":"Kanazawa University , , , ,","place":["Kakuma-machi, Kanazawa, Japan, 920-1192"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2878-7469","authenticated-orcid":true,"given":"Dandan","family":"Huang","sequence":"additional","affiliation":[{"name":"Shanghai Academy of Environmental Sciences , ,","place":["Shanghai, China, 200233"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongjie","family":"Li","sequence":"additional","affiliation":[{"name":"University of Macau , , ,","place":["Macau, China, 999078"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9687-8771","authenticated-orcid":true,"given":"Chak K.","family":"Chan","sequence":"additional","affiliation":[{"name":"City University of Hong Kong , , Tat Chee Avenue , , ,","place":["Kowloon, Hong Kong, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2020,3,3]]},"reference":[{"issue":"1","key":"2026081715252970400_cit1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1016\/j.atmosenv.2007.09.003","article-title":"Air pollution in mega cities in China","volume":"42","author":"Chan","year":"2008","journal-title":"Atmos.\nEnviron."},{"issue":"26","key":"2026081715252970400_cit2","doi-asserted-by":"publisher","first-page":"4223","DOI":"10.1016\/S1352-2310(02)00342-4","article-title":"The water-soluble ionic\ncomposition of PM2.5 in Shanghai and Beijing, China","volume":"36","author":"Yao","year":"2002","journal-title":"Atmos. 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