Yosuke Sakamoto*, Rikudai Mikami, Jiaru Li, Nanase Kohno, Yu Morino, Kei Sato and Yoshizumi Kajii,
{"title":"Heterogeneous Uptake onto Deliquesced Particles as an Atmospheric Fate of Isoprene-Derived Hydroxy-RO2","authors":"Yosuke Sakamoto*, Rikudai Mikami, Jiaru Li, Nanase Kohno, Yu Morino, Kei Sato and Yoshizumi Kajii, ","doi":"10.1021/acsestair.4c0016510.1021/acsestair.4c00165","DOIUrl":null,"url":null,"abstract":"<p >We integrated a chemical conversion technique to transform RO<sub>2</sub> into OH radicals with a method combining laser photolysis radical generation and time-resolved OH radical detection by laser-induced fluorescence (LP-LIF). This approach allowed us to investigate the uptake coefficient of an isoprene-derived hydroxy–RO<sub>2</sub>, ISOPOO (HOC<sub>5</sub>H<sub>8</sub>OO·), onto deliquesced NaCl particles and the effect of transition metal ions (Fe<sup>2+</sup> and Cu<sup>2+</sup>) on this uptake. We measured the uptake coefficients, <i>γ,</i> of ISOPOO on deliquesced NaCl particles doped with FeCl<sub>2</sub> and CuCl<sub>2</sub>, each added at 5 wt % of NaCl, at 301 K and 84% relative humidity (RH). The results were 0.45 ± 0.01 for FeCl<sub>2</sub> and 0.19 ± 0.01 for CuCl<sub>2</sub>. These values were 5 and 2 times greater than the uptake coefficient for deliquesced undoped NaCl particles, which was 0.09 ± 0.01. Preliminary simulation results for the western Japan domain, using a value of γ = 0.09 from a three-dimensional chemical transport model, indicate that the heterogeneous uptake of ISOPOO onto deliquesced particles contributed, on average, less than 3% of the ISOPOO loss process. This contribution increased to as much as 5% in remote forest and mountain areas during high PM<sub>2.5</sub> events.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 5","pages":"713–722 713–722"},"PeriodicalIF":0.0000,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS ES&T Air","FirstCategoryId":"1085","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsestair.4c00165","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
We integrated a chemical conversion technique to transform RO2 into OH radicals with a method combining laser photolysis radical generation and time-resolved OH radical detection by laser-induced fluorescence (LP-LIF). This approach allowed us to investigate the uptake coefficient of an isoprene-derived hydroxy–RO2, ISOPOO (HOC5H8OO·), onto deliquesced NaCl particles and the effect of transition metal ions (Fe2+ and Cu2+) on this uptake. We measured the uptake coefficients, γ, of ISOPOO on deliquesced NaCl particles doped with FeCl2 and CuCl2, each added at 5 wt % of NaCl, at 301 K and 84% relative humidity (RH). The results were 0.45 ± 0.01 for FeCl2 and 0.19 ± 0.01 for CuCl2. These values were 5 and 2 times greater than the uptake coefficient for deliquesced undoped NaCl particles, which was 0.09 ± 0.01. Preliminary simulation results for the western Japan domain, using a value of γ = 0.09 from a three-dimensional chemical transport model, indicate that the heterogeneous uptake of ISOPOO onto deliquesced particles contributed, on average, less than 3% of the ISOPOO loss process. This contribution increased to as much as 5% in remote forest and mountain areas during high PM2.5 events.