ACS ES&T Air最新文献

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Atmospheric Deposition of Microplastics in South Central Appalachia in the United States. 微塑料在美国阿巴拉契亚中南部的大气沉积。
ACS ES&T Air Pub Date : 2024-12-26 eCollection Date: 2025-01-10 DOI: 10.1021/acsestair.4c00189
Adam Elnahas, Austin Gray, Jennie Lee, Noora AlAmiri, Nishan Pokhrel, Steve Allen, Hosein Foroutan
{"title":"Atmospheric Deposition of Microplastics in South Central Appalachia in the United States.","authors":"Adam Elnahas, Austin Gray, Jennie Lee, Noora AlAmiri, Nishan Pokhrel, Steve Allen, Hosein Foroutan","doi":"10.1021/acsestair.4c00189","DOIUrl":"10.1021/acsestair.4c00189","url":null,"abstract":"<p><p>Due to the increased prevalence of plastic pollution globally, atmospheric deposition of microplastics (MPs) is a significant issue that needs to be better understood to identify potential consequences for human health. This study is the first to quantify and characterize atmospheric MP deposition in the Eastern United States. Passive sampling was conducted at two locations within the Eastern United States, specifically in remote South Central Appalachia, from March to September 2023. Each location had five sampling periods, with collections over a 21 day period. Samples were processed to remove biological material, and the presence of MPs was confirmed using Raman spectroscopy to match particles based on polymer similarity. The relative average atmospheric MP deposition in South Central Appalachia was determined to be 68 MPs m<sup>-2</sup> d<sup>-1</sup>. Most verified MPs were fibers, and the most abundant polymer type identified was poly(ethylene terephthalate) PETE. This study's average MP deposition rate is qualitatively comparable to rates reported in other studies that employed a similar methodology in a similar landscape. Scaling up our measured deposition rate to all of South Central Appalachia, an area of over 94,000 km<sup>2</sup> and home to five million people, suggests a yearly MP deposition of approximately 321 metric tonnes. Our study highlights the prevalence of MP deposition in the Eastern United States, providing baseline data for future work to further assess routes of MP introduction.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 1","pages":"64-72"},"PeriodicalIF":0.0,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11730859/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143019519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Physical Health Symptoms and Perceptions of Air Quality among Residents of Smoke-Damaged Homes from a Wildland Urban Interface Fire. 来自野外城市界面火灾的烟雾受损房屋的居民的身体健康症状和空气质量感知。
ACS ES&T Air Pub Date : 2024-12-23 eCollection Date: 2025-01-10 DOI: 10.1021/acsestair.4c00258
Colleen E Reid, Jessica Finlay, Michael Hannigan, Emma S Rieves, Hannah Walters, Courtney Welton-Mitchell, Christine Wiedinmyer, Joost de Gouw, Katherine Dickinson
{"title":"Physical Health Symptoms and Perceptions of Air Quality among Residents of Smoke-Damaged Homes from a Wildland Urban Interface Fire.","authors":"Colleen E Reid, Jessica Finlay, Michael Hannigan, Emma S Rieves, Hannah Walters, Courtney Welton-Mitchell, Christine Wiedinmyer, Joost de Gouw, Katherine Dickinson","doi":"10.1021/acsestair.4c00258","DOIUrl":"10.1021/acsestair.4c00258","url":null,"abstract":"<p><p>The Marshall Fire was a wildland urban interface (WUI) fire that destroyed more than 1000 structures in two communities in Colorado. High winds carried smoke and ash into an unknown number of buildings that, while not incinerated, were significantly damaged. We aimed to understand whether smoke or ash damage to one's home was associated with physical health impacts of the fire event for people living in and around the fire zone whose homes were not completely destroyed. We analyzed data collected from participants who responded to Wave 1 (six months postfire; <i>N</i> = 642) or Wave 2 (one-year postfire; <i>N</i> = 413) of the Marshall Fire Unified Research Survey. We used self-reported exposure to smells and ash in their homes as measures of exposure and also created spatial exposure measures based on proximity to destroyed structures. Reporting a headache was statistically significantly associated with all exposure metrics (self-reported and spatial proximity), and reporting a strange taste in one's mouth was also significantly associated with having more destroyed buildings within 250 m of the home. Study findings can inform response planning for future WUI fires to protect the health of residents of smoke-damaged homes.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 1","pages":"13-23"},"PeriodicalIF":0.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11730870/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143019554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Volatile Organic Compounds Inside Homes Impacted by Smoke from the Marshall Fire. 受马歇尔火灾烟雾影响的房屋内挥发性有机化合物。
ACS ES&T Air Pub Date : 2024-12-23 eCollection Date: 2025-01-10 DOI: 10.1021/acsestair.4c00259
William D Dresser, Jonathan M Silberstein, Colleen E Reid, Marina E Vance, Christine Wiedinmyer, Michael P Hannigan, Joost A de Gouw
{"title":"Volatile Organic Compounds Inside Homes Impacted by Smoke from the Marshall Fire.","authors":"William D Dresser, Jonathan M Silberstein, Colleen E Reid, Marina E Vance, Christine Wiedinmyer, Michael P Hannigan, Joost A de Gouw","doi":"10.1021/acsestair.4c00259","DOIUrl":"10.1021/acsestair.4c00259","url":null,"abstract":"<p><p>Wildfires at the wildland-urban interface (WUI) have been increasing in frequency over recent decades due to increased human development and shifting climatic patterns. The work presented here focuses on the impacts of a WUI fire on indoor air using field measurements of volatile organic compounds (VOCs) by Proton-Transfer-Reaction Time-of-Flight Mass Spectrometry (PTR-TOF-MS). We found a slow decrease in VOC mixing ratios over the course of roughly 5 weeks starting 10 days after the fire, and those levels decreased to ∼20% of the initial indoor value on average. The VOC composition could be described by a combination of biomass burning emissions and indoor air composition. Comparisons were made between polycyclic aromatic hydrocarbon (PAH) distributions in the gas phase and ash, with differences observed in their distribution between each other and when compared to fresh fuel inventory measurements. Mitigation tests were conducted running air cleaners with activated carbon and opening windows to promote indoor-outdoor air exchange, with both methods showing a decrease greater than 50% for average VOC levels indoors while active. We compare our results with simulated smoke impact experiments that show the slow decline in VOCs must be understood in the context of indoor reservoirs, beyond just on surfaces, leading to the slow release of VOCs to indoor air.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 1","pages":"4-12"},"PeriodicalIF":0.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11730946/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143019565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spatiotemporal Mapping of Ultrafine Particle Fluxes in an Office HVAC System with a Diffusion Charger Sensor Array. 带有扩散充电传感器阵列的办公室HVAC系统中超细颗粒通量的时空映射。
ACS ES&T Air Pub Date : 2024-12-17 eCollection Date: 2025-01-10 DOI: 10.1021/acsestair.4c00140
Danielle N Wagner, Nusrat Jung, Brandon E Boor
{"title":"Spatiotemporal Mapping of Ultrafine Particle Fluxes in an Office HVAC System with a Diffusion Charger Sensor Array.","authors":"Danielle N Wagner, Nusrat Jung, Brandon E Boor","doi":"10.1021/acsestair.4c00140","DOIUrl":"10.1021/acsestair.4c00140","url":null,"abstract":"<p><p>Commercial HVAC systems intended to mitigate indoor air pollution are operated based on standards that exclude aerosols with smaller diameters, such as ultrafine particles (UFPs, D<sub>p</sub> ≤ 100 nm), which dominate a large proportion of indoor and outdoor number-based particle size distributions. UFPs generated from occupant activities or infiltrating from the outdoors can be recirculated and accumulate indoors when they are not successfully filtered by an air handling unit. Monitoring UFPs in real occupied environments is vital to understanding these source and mitigation dynamics, but capturing their rapid transience across multiple locations can be challenging due to high-cost instrumentation. This 9-month field measurement campaign pairs four medium-cost diffusion charger sensors with volumetric airflow rates modulated and monitored in a cloud-based building automation system of an open-plan living laboratory office and dedicated air handling unit to evaluate spatiotemporal particle number and surface area concentrations and migration trends. Particle number flux rates reveal that an estimated daily median of 8 × 10<sup>13</sup> UFPs enter the air handling unit from the outdoors. Switching from a MERV14 to a HEPA filter reduces the number of UFPs supplied to the room by tens of trillions of UFPs daily, increasing the median filtration efficiency from 40% to 96%. These results demonstrate the efficacy of an optimal air handling unit's performance to improve indoor air quality, while highlighting UFP dynamics that are not accounted for in current filtration standards nor in occupant-centered HVAC control. Scalable sensor development can popularize UFP monitoring and allow for future UFP integration within building control and automation platforms. The framework established for this campaign can be used to evaluate particle fluxes considering different analytes.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 1","pages":"49-63"},"PeriodicalIF":0.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11730965/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143019560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impacts of Aging and Relative Humidity on Properties of Biomass Burning Smoke Particles. 老化和相对湿度对生物质燃烧烟气颗粒特性的影响
ACS ES&T Air Pub Date : 2024-12-06 eCollection Date: 2025-01-10 DOI: 10.1021/acsestair.4c00224
Sofie K Schwink, Liora E Mael, Thomas H Dunnington, Maximilian J Schmid, Jonathan M Silberstein, Andrew Heck, Nicholas Gotlib, Michael P Hannigan, Marina E Vance
{"title":"Impacts of Aging and Relative Humidity on Properties of Biomass Burning Smoke Particles.","authors":"Sofie K Schwink, Liora E Mael, Thomas H Dunnington, Maximilian J Schmid, Jonathan M Silberstein, Andrew Heck, Nicholas Gotlib, Michael P Hannigan, Marina E Vance","doi":"10.1021/acsestair.4c00224","DOIUrl":"10.1021/acsestair.4c00224","url":null,"abstract":"<p><p>Quantifying changes in the properties of smoke aerosols under varying conditions is important for understanding the health and environmental impacts of exposure to smoke. Smoke composition, aerosol liquid water content, effective density (ρ<sub>eff</sub>), and other properties can change significantly as smoke travels through areas under different ambient conditions and over time. During this study, we measured changes in smoke composition and physical properties due to oxidative aging and exposure to humidity. We found that smoke aging led to SOA formation and increases in ratios of organic carbon to elemental carbon. Aerosol liquid water content increased with increasing relative humidity (RH), and aged smoke took up more water than fresh smoke at all humidity levels, likely due to a combination of changes in aerosol surface polarity at low and medium RH and increases in surface area with aging at high RH. Growth factors ranged from 1.06 ± 0.08 for fresh smoke at low RH to 1.32 ± 0.08 for aged smoke at high RH. Oxidative aging and exposure to humidity led to increases in ρ<sub>eff</sub>. For 100 nm particles, ρ<sub>eff</sub> ranged from ∼1.2 for fresh smoke at low RH to ∼1.6 for aged smoke at high RH. Results from these experiments suggest that exposure to humidity leads to smoke restructuring and compaction and/or changes in surface chemistry.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 1","pages":"109-118"},"PeriodicalIF":0.0,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11730893/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143019549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Encountering Prescribed Fire: Characterizing the Intersection of Prescribed Fire and Wildfire in the CONUS. 遇到规定的火:在CONUS中规定的火和野火的交集特征。
ACS ES&T Air Pub Date : 2024-11-27 eCollection Date: 2024-12-13 DOI: 10.1021/acsestair.4c00228
James L Beidler, Kirk R Baker, George Pouliot, Jason D Sacks
{"title":"Encountering Prescribed Fire: Characterizing the Intersection of Prescribed Fire and Wildfire in the CONUS.","authors":"James L Beidler, Kirk R Baker, George Pouliot, Jason D Sacks","doi":"10.1021/acsestair.4c00228","DOIUrl":"10.1021/acsestair.4c00228","url":null,"abstract":"<p><p>Prescribed fire is applied across the United States as a fuel treatment to manage the impact of wildfires and restore ecosystems. While the recent application of prescribed fire has largely been confined to the southeastern US, the increase in catastrophic wildfires has accelerated the growth of prescribed fire more broadly. To effectively achieve wildfire risk reduction benefits, which includes reducing the amount of smoke emitted, the area treated by prescribed fire must come into contact with a subsequent wildfire. In this study, we applied timely and consistent geospatially resolved data sets of prescribed fires and wildfires to estimate the rate at which an area treated by prescribed fire encounters a subsequent wildfire. We summarize these encounter rates across time intervals, prescribed fire treatment area, and number of previous prescribed fires and by region. On all U.S. Forest Service lands across the Conterminous US (CONUS) 6.2% of prescribed fire treated area from 2003-2022 encountered a subsequent wildfire in 2004-2023. Encounter rates were highest in western US forests, which tend to be more impacted by wildfire than the eastern US, and lower in the eastern US. Encounter rates increased with treatment area in the southeastern US but were relatively flat in the northwest. For the CONUS, encounter rates increased with longer time intervals, associated with diminished potential for reducing wildfire severity, between prescribed fire and the subsequent wildfire area burned. Our results provide timely information on prescribed fire and wildfire interactions that can be leveraged to optimize analyses of the trade-offs between prescribed fire and wildfire.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"1 12","pages":"1687-1695"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11650585/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Noncombustion Emissions of Organic Acids at a Site near Boise, Idaho. 爱达荷州博伊西附近一个站点的非燃烧排放物有机酸。
ACS ES&T Air Pub Date : 2024-11-27 eCollection Date: 2024-12-13 DOI: 10.1021/acsestair.4c00138
Andrew J Lindsay, Brigitte M Weesner, Kyle Banecker, Lee V Feinman, Russell W Long, Matthew S Landis, Ezra C Wood
{"title":"Noncombustion Emissions of Organic Acids at a Site near Boise, Idaho.","authors":"Andrew J Lindsay, Brigitte M Weesner, Kyle Banecker, Lee V Feinman, Russell W Long, Matthew S Landis, Ezra C Wood","doi":"10.1021/acsestair.4c00138","DOIUrl":"10.1021/acsestair.4c00138","url":null,"abstract":"<p><p>Gas-phase organic acids are ubiquitous in the atmosphere with mixing ratios of several species, such as formic acid and acetic acid, often as high as several parts per billion by volume (ppbv). Organic acids are produced via photochemical reactions and are also directly emitted from various sources, including combustion, microbial activity, vegetation, soils, and ruminants. We present measurements of gas-phase formic, acetic, propionic, pyruvic, and pentanoic acids from a site near Boise, Idaho, in August 2019 made by iodide-adduct chemical ionization mass spectrometry (CIMS). The site is adjacent to a major interstate highway and beyond the urban/suburban core is surrounded by national forests to the north and northeast and by farmland to the west and south. Maximum mixing ratios of formic, acetic, propionic, and pentanoic acid were typically near 10, 3, 0.4, and 0.2 ppbv, respectively. Observed daytime concentrations of these acids were mostly consistent with other studies, but concentrations were persistently the highest at night between 20:00 to 8:00 (local standard time). Such elevated nighttime concentrations are unlike most other reported organic acid measurements. Although there were times when organic acid concentrations were enhanced by mobile source emissions, the organic acid concentrations appear to be mainly controlled by noncombustion surface primary emissions. Source apportionment by positive matrix factorization (PMF) supports the importance of significant noncombustion, nonphotochemical emissions. Two agricultural surface sources were identified and estimated to contribute to greater than half of total observed concentrations of formic and acetic acid. In contrast to the other measured organic acids, but in agreement with all other reported measurements in the literature, pyruvic acid concentrations peaked during the daytime and were largely controlled by photochemistry.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"1 12","pages":"1568-1578"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11650544/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Chemical Fate of Particulate Sulfur from Nighttime Oxidation of Thiophene. 夜间氧化噻吩产生的微粒硫的化学归宿。
ACS ES&T Air Pub Date : 2024-11-27 eCollection Date: 2024-12-13 DOI: 10.1021/acsestair.4c00164
Michael Lum, Kunpeng Chen, Bradley Ries, Linhui Tian, Raphael Mayorga, Yumeng Cui, Nilofar Raeofy, David Cocker, Haofei Zhang, Roya Bahreini, Ying-Hsuan Lin
{"title":"Chemical Fate of Particulate Sulfur from Nighttime Oxidation of Thiophene.","authors":"Michael Lum, Kunpeng Chen, Bradley Ries, Linhui Tian, Raphael Mayorga, Yumeng Cui, Nilofar Raeofy, David Cocker, Haofei Zhang, Roya Bahreini, Ying-Hsuan Lin","doi":"10.1021/acsestair.4c00164","DOIUrl":"10.1021/acsestair.4c00164","url":null,"abstract":"<p><p>Sulfur-containing volatile organic compounds emitted during wildfire events, such as dimethyl sulfide, are known to form secondary aerosols containing inorganic sulfate (SO<sub>4</sub> <sup>2-</sup>) and surfactant-like organic compounds; however, little is known about the fate of sulfur in other emitted reduced organosulfur species. This study aimed to determine the sulfurous product distribution resulting from the nighttime oxidation of thiophene as a model system. Ion chromatography (IC) and aerosol mass spectrometry (a mini aerosol mass spectrometer, mAMS) were used to constrain the proportions of sulfurous compounds produced under wildfire-relevant conditions ([NO<sub>2</sub>]/[O<sub>3</sub>] = 0.1). With constraints from IC, results indicated that the sulfurous particle mass consisted of 30.3 ± 6.6% SO<sub>4</sub> <sup>2-</sup>, while mAMS fractionation attributed 24.5 ± 1.6% of total sulfate signal to SO<sub>4</sub> <sup>2-</sup>, 15.4 ± 1.9% to organosulfates, and 60.1 ± 0.9% to sulfonates. Empirical formulas of organosulfur products were identified as C1-C8 organosulfates and sulfonates using complementary mass spectrometry techniques. This study highlights the nighttime oxidation of thiophene and its derivatives as a source of SO<sub>4</sub> <sup>2-</sup> and particulate organosulfur compounds, which have important implications for the atmospheric sulfur budget and aerosol/droplet physical and chemical properties.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"1 12","pages":"1637-1649"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11650645/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Noncombustion Emissions of Organic Acids at a Site near Boise, Idaho 爱达荷州博伊西附近一个站点的非燃烧排放物有机酸
ACS ES&T Air Pub Date : 2024-11-27 DOI: 10.1021/acsestair.4c0013810.1021/acsestair.4c00138
Andrew J. Lindsay, Brigitte M. Weesner, Kyle Banecker, Lee V. Feinman, Russell W. Long, Matthew S. Landis and Ezra C. Wood*, 
{"title":"Noncombustion Emissions of Organic Acids at a Site near Boise, Idaho","authors":"Andrew J. Lindsay,&nbsp;Brigitte M. Weesner,&nbsp;Kyle Banecker,&nbsp;Lee V. Feinman,&nbsp;Russell W. Long,&nbsp;Matthew S. Landis and Ezra C. Wood*,&nbsp;","doi":"10.1021/acsestair.4c0013810.1021/acsestair.4c00138","DOIUrl":"https://doi.org/10.1021/acsestair.4c00138https://doi.org/10.1021/acsestair.4c00138","url":null,"abstract":"<p >Gas-phase organic acids are ubiquitous in the atmosphere with mixing ratios of several species, such as formic acid and acetic acid, often as high as several parts per billion by volume (ppbv). Organic acids are produced via photochemical reactions and are also directly emitted from various sources, including combustion, microbial activity, vegetation, soils, and ruminants. We present measurements of gas-phase formic, acetic, propionic, pyruvic, and pentanoic acids from a site near Boise, Idaho, in August 2019 made by iodide-adduct chemical ionization mass spectrometry (CIMS). The site is adjacent to a major interstate highway and beyond the urban/suburban core is surrounded by national forests to the north and northeast and by farmland to the west and south. Maximum mixing ratios of formic, acetic, propionic, and pentanoic acid were typically near 10, 3, 0.4, and 0.2 ppbv, respectively. Observed daytime concentrations of these acids were mostly consistent with other studies, but concentrations were persistently the highest at night between 20:00 to 8:00 (local standard time). Such elevated nighttime concentrations are unlike most other reported organic acid measurements. Although there were times when organic acid concentrations were enhanced by mobile source emissions, the organic acid concentrations appear to be mainly controlled by noncombustion surface primary emissions. Source apportionment by positive matrix factorization (PMF) supports the importance of significant noncombustion, nonphotochemical emissions. Two agricultural surface sources were identified and estimated to contribute to greater than half of total observed concentrations of formic and acetic acid. In contrast to the other measured organic acids, but in agreement with all other reported measurements in the literature, pyruvic acid concentrations peaked during the daytime and were largely controlled by photochemistry.</p><p >In this study, measurements of several carboxylic acids near Boise, Idaho, are presented. Notably, the concentrations of carboxylic acids were elevated at nighttime, indicating a significant nearby surface source, likely from agriculture.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"1 12","pages":"1568–1578 1568–1578"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestair.4c00138","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142850904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Chemical Fate of Particulate Sulfur from Nighttime Oxidation of Thiophene 夜间氧化噻吩产生的微粒硫的化学归宿
ACS ES&T Air Pub Date : 2024-11-27 DOI: 10.1021/acsestair.4c0016410.1021/acsestair.4c00164
Michael Lum, Kunpeng Chen, Bradley Ries, Linhui Tian, Raphael Mayorga, Yumeng Cui, Nilofar Raeofy, David Cocker, Haofei Zhang, Roya Bahreini* and Ying-Hsuan Lin*, 
{"title":"Chemical Fate of Particulate Sulfur from Nighttime Oxidation of Thiophene","authors":"Michael Lum,&nbsp;Kunpeng Chen,&nbsp;Bradley Ries,&nbsp;Linhui Tian,&nbsp;Raphael Mayorga,&nbsp;Yumeng Cui,&nbsp;Nilofar Raeofy,&nbsp;David Cocker,&nbsp;Haofei Zhang,&nbsp;Roya Bahreini* and Ying-Hsuan Lin*,&nbsp;","doi":"10.1021/acsestair.4c0016410.1021/acsestair.4c00164","DOIUrl":"https://doi.org/10.1021/acsestair.4c00164https://doi.org/10.1021/acsestair.4c00164","url":null,"abstract":"<p >Sulfur-containing volatile organic compounds emitted during wildfire events, such as dimethyl sulfide, are known to form secondary aerosols containing inorganic sulfate (SO<sub>4</sub><sup>2–</sup>) and surfactant-like organic compounds; however, little is known about the fate of sulfur in other emitted reduced organosulfur species. This study aimed to determine the sulfurous product distribution resulting from the nighttime oxidation of thiophene as a model system. Ion chromatography (IC) and aerosol mass spectrometry (a mini aerosol mass spectrometer, mAMS) were used to constrain the proportions of sulfurous compounds produced under wildfire-relevant conditions ([NO<sub>2</sub>]/[O<sub>3</sub>] = 0.1). With constraints from IC, results indicated that the sulfurous particle mass consisted of 30.3 ± 6.6% SO<sub>4</sub><sup>2–</sup>, while mAMS fractionation attributed 24.5 ± 1.6% of total sulfate signal to SO<sub>4</sub><sup>2–</sup>, 15.4 ± 1.9% to organosulfates, and 60.1 ± 0.9% to sulfonates. Empirical formulas of organosulfur products were identified as C1–C8 organosulfates and sulfonates using complementary mass spectrometry techniques. This study highlights the nighttime oxidation of thiophene and its derivatives as a source of SO<sub>4</sub><sup>2–</sup> and particulate organosulfur compounds, which have important implications for the atmospheric sulfur budget and aerosol/droplet physical and chemical properties.</p><p >Little is known about the atmospheric oxidation of volatile organosulfur compounds found in biomass burning emissions. This study investigates the fate of volatile organosulfur compounds and the distribution of sulfurous products in secondary aerosols, with implications for aerosol physical and chemical properties.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"1 12","pages":"1637–1649 1637–1649"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestair.4c00164","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142843545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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