{"title":"从芳香挥发性化学产品中气相臭氧分解和二次羟基生成麝香化合物开士美兰。","authors":"Ayomide A Akande, Nadine Borduas-Dedekind","doi":"10.1039/d4em00452c","DOIUrl":null,"url":null,"abstract":"<p><p>Fragrant personal care products are a subset of volatile chemical products (VCPs), an emerging source of outdoor pollutants capable of impacting air quality. Fragrant molecules, such as musks, are used in perfumes and have been found in aquatic organisms, water bodies, indoor air, and urban environments. Considering the distribution of musk-smelling compounds, there is a need to constrain their atmospheric fate indoors and outdoors. Here, we used a Vocus proton-transfer-reaction time-of-flight mass spectrometer to quantify the atmospheric oxidative fate of cashmeran, a bicyclic musk compound, detected in a commercial perfume alongside galaxolide, astratone and rosamusk. Cashmeran concentrations rose up to 0.35 ppbv representing a mass yield of 0.33 ± 0.04% of the perfume. We determined the second order rate constant of the cyclo-addition of O<sub>3</sub> with cashmeran to be (2.78 ± 0.31) × 10<sup>-19</sup> cm<sup>3</sup> molec<sup>-1</sup> s<sup>-1</sup> at 293 ± 1 K in N<sub>2</sub>. This rate constant corresponds to an 85 day lifetime against 20 ppbv of O<sub>3</sub>. Then, we repeated the ozonolysis experiments in air with 20% O<sub>2</sub> and measured significant secondary OH concentrations up to 5.1 × 10<sup>5</sup> molec cm<sup>-3</sup>. Consequently, the lifetime of cashmeran in our experiment was shortened to 5 h. Thus, the oxidation of fragrant molecules, like cashmeran, could alter the oxidative capacity of indoor air <i>via</i> the production of secondary OH radicals. Furthermore, our results show that cashmeran is long-lived and could serve as a VCP tracer in urban air.</p>","PeriodicalId":74,"journal":{"name":"Environmental Science: Processes & Impacts","volume":" ","pages":""},"PeriodicalIF":4.3000,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The gas phase ozonolysis and secondary OH production of cashmeran, a musk compound from fragrant volatile chemical products.\",\"authors\":\"Ayomide A Akande, Nadine Borduas-Dedekind\",\"doi\":\"10.1039/d4em00452c\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Fragrant personal care products are a subset of volatile chemical products (VCPs), an emerging source of outdoor pollutants capable of impacting air quality. Fragrant molecules, such as musks, are used in perfumes and have been found in aquatic organisms, water bodies, indoor air, and urban environments. Considering the distribution of musk-smelling compounds, there is a need to constrain their atmospheric fate indoors and outdoors. Here, we used a Vocus proton-transfer-reaction time-of-flight mass spectrometer to quantify the atmospheric oxidative fate of cashmeran, a bicyclic musk compound, detected in a commercial perfume alongside galaxolide, astratone and rosamusk. Cashmeran concentrations rose up to 0.35 ppbv representing a mass yield of 0.33 ± 0.04% of the perfume. We determined the second order rate constant of the cyclo-addition of O<sub>3</sub> with cashmeran to be (2.78 ± 0.31) × 10<sup>-19</sup> cm<sup>3</sup> molec<sup>-1</sup> s<sup>-1</sup> at 293 ± 1 K in N<sub>2</sub>. This rate constant corresponds to an 85 day lifetime against 20 ppbv of O<sub>3</sub>. Then, we repeated the ozonolysis experiments in air with 20% O<sub>2</sub> and measured significant secondary OH concentrations up to 5.1 × 10<sup>5</sup> molec cm<sup>-3</sup>. Consequently, the lifetime of cashmeran in our experiment was shortened to 5 h. Thus, the oxidation of fragrant molecules, like cashmeran, could alter the oxidative capacity of indoor air <i>via</i> the production of secondary OH radicals. Furthermore, our results show that cashmeran is long-lived and could serve as a VCP tracer in urban air.</p>\",\"PeriodicalId\":74,\"journal\":{\"name\":\"Environmental Science: Processes & Impacts\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2024-10-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Environmental Science: Processes & Impacts\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://doi.org/10.1039/d4em00452c\",\"RegionNum\":3,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, ANALYTICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Science: Processes & Impacts","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1039/d4em00452c","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
The gas phase ozonolysis and secondary OH production of cashmeran, a musk compound from fragrant volatile chemical products.
Fragrant personal care products are a subset of volatile chemical products (VCPs), an emerging source of outdoor pollutants capable of impacting air quality. Fragrant molecules, such as musks, are used in perfumes and have been found in aquatic organisms, water bodies, indoor air, and urban environments. Considering the distribution of musk-smelling compounds, there is a need to constrain their atmospheric fate indoors and outdoors. Here, we used a Vocus proton-transfer-reaction time-of-flight mass spectrometer to quantify the atmospheric oxidative fate of cashmeran, a bicyclic musk compound, detected in a commercial perfume alongside galaxolide, astratone and rosamusk. Cashmeran concentrations rose up to 0.35 ppbv representing a mass yield of 0.33 ± 0.04% of the perfume. We determined the second order rate constant of the cyclo-addition of O3 with cashmeran to be (2.78 ± 0.31) × 10-19 cm3 molec-1 s-1 at 293 ± 1 K in N2. This rate constant corresponds to an 85 day lifetime against 20 ppbv of O3. Then, we repeated the ozonolysis experiments in air with 20% O2 and measured significant secondary OH concentrations up to 5.1 × 105 molec cm-3. Consequently, the lifetime of cashmeran in our experiment was shortened to 5 h. Thus, the oxidation of fragrant molecules, like cashmeran, could alter the oxidative capacity of indoor air via the production of secondary OH radicals. Furthermore, our results show that cashmeran is long-lived and could serve as a VCP tracer in urban air.
期刊介绍:
Environmental Science: Processes & Impacts publishes high quality papers in all areas of the environmental chemical sciences, including chemistry of the air, water, soil and sediment. We welcome studies on the environmental fate and effects of anthropogenic and naturally occurring contaminants, both chemical and microbiological, as well as related natural element cycling processes.