ACS ES&T Air最新文献_第3页

Tillandsia usneoides for Atmosphere Composition Biomonitoring: A Cross-Validation Study 用于大气成分生物监测的凤仙花交叉验证研究

ACS ES&T Air Pub Date : 2025-03-12 DOI: 10.1021/acsestair.4c0025210.1021/acsestair.4c00252

Aude Calas*, Eva Schreck, Véronique Pont, Jérôme Viers, Philippe Behra, Maria Dias-Alves, Éric Gardrat, Alain Pages and Astrid Avellan,

{"title":"Tillandsia usneoides for Atmosphere Composition Biomonitoring: A Cross-Validation Study","authors":"Aude Calas*, Eva Schreck, Véronique Pont, Jérôme Viers, Philippe Behra, Maria Dias-Alves, Éric Gardrat, Alain Pages and Astrid Avellan, ","doi":"10.1021/acsestair.4c0025210.1021/acsestair.4c00252","DOIUrl":"https://doi.org/10.1021/acsestair.4c00252https://doi.org/10.1021/acsestair.4c00252","url":null,"abstract":"Tracking for particulate matter (PM) contamination is a tedious task that requires sophisticated samplers powered by electricity. Biomonitoring strategies have been developed to assess PM contamination. Among them, epiphyte plants are widely utilized due to their reliance on atmospheric inputs for nutrition. However, robust assessment of the effectiveness of such strategies remains limited. This study aimed to assess whether Tillandsia usneoides can accurately characterize PM contamination across four sites in a former French mining district over one year. Comparisons were made between (i) PM10 samplers capturing PM with an aerodynamic diameter < 10 μm and (ii) T. usneoides, which is assumed to accumulate all deposited particles (both wet and dry). The finding reveals that atmospheric composition measured by PM10 samplers and T. usneoides is consistent for 14 of the 27 elements analyzed. However, elements related to (micro)nutrients or those chemically similar to nutrients (Na, Rb, Sr), showed no significant or positive correlation. While epiphyte plants offer a cost-effective and efficient tool for (bio)monitoring PM composition, results involving elements playing a role in plant metabolism should be interpreted with caution. Further research should better highlight the mechanisms governing the complex interplays between PM properties, epiphyte microstructure, metabolic responses, and abiotic factors.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 4","pages":"522–529 522–529"},"PeriodicalIF":0.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photolytic Mass Loss of Secondary Organic Aerosol Derived from Photooxidation of Biomass Burning Furan Precursors 燃烧呋喃前体生物质光氧化产生的二次有机气溶胶的光解质量损失

ACS ES&T Air Pub Date : 2025-03-11 DOI: 10.1021/acsestair.4c0023010.1021/acsestair.4c00230

Nara Shin, Bin Bai, Taekyu Joo, Yuchen Wang, Nga L. Ng* and Pengfei Liu*,

{"title":"Photolytic Mass Loss of Secondary Organic Aerosol Derived from Photooxidation of Biomass Burning Furan Precursors","authors":"Nara Shin, Bin Bai, Taekyu Joo, Yuchen Wang, Nga L. Ng* and Pengfei Liu*, ","doi":"10.1021/acsestair.4c0023010.1021/acsestair.4c00230","DOIUrl":"https://doi.org/10.1021/acsestair.4c00230https://doi.org/10.1021/acsestair.4c00230","url":null,"abstract":"Direct photolysis as a potentially important chemical loss pathway for atmospheric organic aerosol (OA) is increasingly recognized but remains highly uncertain, particularly for secondary organic aerosol (SOA) derived from biomass burning (BB) precursors. We present the measurements of the photolytic mass change of SOA derived from photooxidation of three furan precursors, 3-methylfuran, 2-methylfuran, and furfural, in an environmental chamber under both dry and humid conditions. Each type of SOA was collected on crystal sensors, and the mass losses by photolysis under 300 or 340 nm light were continuously monitored using a quartz crystal microbalance (QCM). By incorporation of measurements and modeling, 10–40% of furan SOA masses can be lost by direct photolysis under solar radiation over their typical atmospheric lifetime. The mass loss fraction is well correlated with the mass fraction of nitrogen-containing compounds (NOC) in the SOA, possibly because these species can largely enhance the light absorption cross section and readily undergo photodissociation under UV light.Biomass burning is a large source of volatile organic compounds, such as furan species, which further produce secondary organic aerosol (SOA) in the atmosphere. The measurements and modeling suggest that 10−40% of the furan SOA masses can be photolyzed under solar radiation over its typical atmospheric lifetime.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 4","pages":"476–485 476–485"},"PeriodicalIF":0.0,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestair.4c00230","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814480","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

Constraining Gas Phase Yields and Reactive Uptake Coefficients of Oxidation Products from the Hydroxyl Radical-Isoprene Reaction onto Acidic Particles by Vocus Ammonia-Adduct Chemical Ionization Mass Spectrometry (Vocus NH4+ CIMS) Vocus氨加合物化学电离质谱法（Vocus NH4+ CIMS）对羟基自由基-异戊二烯氧化反应气相产率和反应吸收系数的约束

ACS ES&T Air Pub Date : 2025-03-06 DOI: 10.1021/acsestair.4c0036710.1021/acsestair.4c00367

Jiayun Zhao, Sahir Gagan, Molly P. Frauenheim, Sining Niu, Bianca Aridjis-Olivos, Jason D. Surratt, Zhenfa Zhang, Avram Gold, Renyi Zhang* and Yue Zhang*,

{"title":"Constraining Gas Phase Yields and Reactive Uptake Coefficients of Oxidation Products from the Hydroxyl Radical-Isoprene Reaction onto Acidic Particles by Vocus Ammonia-Adduct Chemical Ionization Mass Spectrometry (Vocus NH4+ CIMS)","authors":"Jiayun Zhao, Sahir Gagan, Molly P. Frauenheim, Sining Niu, Bianca Aridjis-Olivos, Jason D. Surratt, Zhenfa Zhang, Avram Gold, Renyi Zhang* and Yue Zhang*, ","doi":"10.1021/acsestair.4c0036710.1021/acsestair.4c00367","DOIUrl":"https://doi.org/10.1021/acsestair.4c00367https://doi.org/10.1021/acsestair.4c00367","url":null,"abstract":"Isoprene, the most abundant nonmethane volatile organic compound in the atmosphere, undergoes photochemical reactions with hydroxyl radical (•OH), a major sink for isoprene, leading to the formation of secondary organic aerosol (SOA). Using a Vocus Chemical Ionization Mass Spectrometer with ammonium-adduct ions (Vocus NH4+ CIMS), this study used the positive ion mode to quantify the yields and time-dependent reactive uptake of oxidized volatile organic compounds (OVOCs) produced from •OH-initiated oxidation of isoprene under dry conditions. Molar gas-phase yields of key oxidation products were constrained using sensitivities derived from a voltage scan of the front and back end of the Vocus ion–molecule reactor region. Carefully designed chamber experiments measured uptake coefficients (γ) for key isoprene-derived oxidation products onto acidic sulfate particles. The γ values for both C5H10O3 isomers (IEPOX/ISOPOOH) and C5H8O4, another epoxy species from isoprene photo-oxidation, rapidly decreased as the SOA coating thickness increased, demonstrating a self-limiting effect. Despite ISOPOOH/IEPOX contributing around 80% to total reactive uptake, other oxidation products from isoprene photooxidation were estimated to contribute 20% of the total SOA formation. These findings highlight the importance for future models to consider the self-limiting effects of ISOPOOH/IEPOX and SOA formation through non-IEPOX pathways.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 4","pages":"665–676 665–676"},"PeriodicalIF":0.0,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Indoor Air Quality: Chemical Processes and Dynamics 室内空气质量：化学过程和动力学

ACS ES&T Air Pub Date : 2025-03-06 DOI: 10.1021/acsestair.5c0006010.1021/acsestair.5c00060

Rachel O’Brien*,

引用次数: 0

Assessing Ambient Formaldehyde Exposure and Estimating Cancer Risks over India using the Ozone Monitoring Instrument Satellite Sensor 使用臭氧监测仪器卫星传感器评估印度的环境甲醛暴露和估计癌症风险

ACS ES&T Air Pub Date : 2025-03-05 DOI: 10.1021/acsestair.4c0018810.1021/acsestair.4c00188

Deeksha Gautam*, Sajeev Philip, Sagnik Dey, Matthew S. Johnson, Ekta Chaudhary, Zolal Ayazpour and Gonzalo González Abad,

{"title":"Assessing Ambient Formaldehyde Exposure and Estimating Cancer Risks over India using the Ozone Monitoring Instrument Satellite Sensor","authors":"Deeksha Gautam*, Sajeev Philip, Sagnik Dey, Matthew S. Johnson, Ekta Chaudhary, Zolal Ayazpour and Gonzalo González Abad, ","doi":"10.1021/acsestair.4c0018810.1021/acsestair.4c00188","DOIUrl":"https://doi.org/10.1021/acsestair.4c00188https://doi.org/10.1021/acsestair.4c00188","url":null,"abstract":"Estimating human exposure to formaldehyde (HCHO) is challenging due to sparse in situ measurements over India. We develop an ambient HCHO exposure data set to assess the long-term changes in exposure and to calculate the potential HCHO-related cancer risks in India. We estimate the long-term mean (2005–2019) annual 24-h average surface HCHO concentrations at a spatial resolution of 0.1° × 0.1° (latitude × longitude) over India by scaling the HCHO vertical column density retrievals from the Ozone Monitoring Instrument (OMI) satellite sensor with the atmospheric profile information from the MERRA2 GMI chemical transport model. We find an increase in long-term HCHO exposure of >0.05 ppb (parts per billion by volume) for most Indian states (2015–2019 annual mean compared to 2005–2009 mean). The OMI-based estimate shows that the Indian population of 40,000–76,000 will likely be under enhanced cancer risk due to exposure to long-term ambient HCHO. We find highest HCHO exposure values for rural regions compared to urban areas in most Indian states except Delhi national capital region. This study shows that HCHO pollution in India is a regional-centric issue. Therefore, emission mitigation policies should focus on reducing HCHO in both urban and rural regions.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 4","pages":"437–445 437–445"},"PeriodicalIF":0.0,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predicting Liquid–Liquid Phase Separation of Submicrometer Proxies for Atmospheric Secondary Aerosol 预测大气二次气溶胶亚微米代用物的液-液相分离

ACS ES&T Air Pub Date : 2025-03-04 DOI: 10.1021/acsestair.4c0025410.1021/acsestair.4c00254

Qishen Huang, Kiran R. Pitta, Andreas Zuend and Miriam Arak Freedman*,

{"title":"Predicting Liquid–Liquid Phase Separation of Submicrometer Proxies for Atmospheric Secondary Aerosol","authors":"Qishen Huang, Kiran R. Pitta, Andreas Zuend and Miriam Arak Freedman*, ","doi":"10.1021/acsestair.4c0025410.1021/acsestair.4c00254","DOIUrl":"https://doi.org/10.1021/acsestair.4c00254https://doi.org/10.1021/acsestair.4c00254","url":null,"abstract":"Liquid–liquid phase separation (LLPS) of atmospheric aerosols can significantly impact climate, air quality, and human health. However, their complex composition, small size, and history-dependent properties result in great uncertainty in the modeling of aerosol phase state and atmospheric processes. Herein, using cryogenic transmission electron microscopy (cryo-TEM), we examined model submicron aerosols composed of organic compounds and ammonium sulfate and established a parametrization for the separation relative humidity (SRH) that accounts for chemical composition, particle size, and equilibration time. We evaluated different variables that describe chemical composition: O/C ratio, partition coefficient, solubility, molar mass, and polarizability. The O/C ratio fits the SRH of micrometer droplets best, and by using a scaling factor to translate the micrometer SRH parametrization to submicron aerosols, we incorporate the effects of size and equilibration time. The measured scaling factor for the submicron mean SRH (30 nm–1 μm, 20 min equilibration times) is 0.80, and the factor becomes 1 with equilibration time over 1 h and is equal to 0, meaning that SRH is absent, when the aerosol dry diameter is smaller than 30 nm. Our parametrization will aid in universal SRH modeling, potentially leading to more accurate predictions of aerosol mass, optical properties, hygroscopicity, and heterogeneous chemistry.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 4","pages":"530–539 530–539"},"PeriodicalIF":0.0,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing the Performance of Point Sensor Continuous Monitoring Systems at Midstream Natural Gas Compressor Stations 中游天然气压缩站点传感器连续监测系统性能评估

ACS ES&T Air Pub Date : 2025-03-04 DOI: 10.1021/acsestair.4c0022710.1021/acsestair.4c00227

Shuting Lydia Yang*, and , Arvind P. Ravikumar,

{"title":"Assessing the Performance of Point Sensor Continuous Monitoring Systems at Midstream Natural Gas Compressor Stations","authors":"Shuting Lydia Yang*,  and , Arvind P. Ravikumar, ","doi":"10.1021/acsestair.4c0022710.1021/acsestair.4c00227","DOIUrl":"https://doi.org/10.1021/acsestair.4c00227https://doi.org/10.1021/acsestair.4c00227","url":null,"abstract":"Continuous Monitoring Systems (CMS) are a promising technology to detect and quantify intermittent and high-volume methane emissions across the oil and gas supply chain. This is particularly salient at midstream compressor stations, where the contribution of short-duration emission events to total emissions makes survey-type technologies less suitable for developing accurate measurement-informed inventories. In this work, we report on the first concurrent and long-term test of five CMS technologies to detect, localize, and quantify methane emission from two major types of midstream compressor stations found in the US – a turbine-only station and an engine-only station. We find that CMS technologies can distinguish between different operational states of engine-driven compressors with large CH4 emissions contribution from compressor exhaust. Combining known events at these facilities with in situ controlled releases, we observe that all CMS technologies generally struggle in identifying short-duration (<30 min) or low emission rate (relative to baseline) events. Critically, we find that positive event detection, based on analysis of underlying methane signals, frequently did not translate to alerts sent to the operators. Deployment of CMS at midstream compressor stations must proceed with caution based on specific applications, site configuration, and the nature of baseline emissions.This study reports on the concurrent test of five Continuous Monitoring Systems to detect, localize, and quantify methane emission and informs the practical deployment and limits of Continuous Monitoring Systems at midstream natural gas facilities.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 4","pages":"466–475 466–475"},"PeriodicalIF":0.0,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestair.4c00227","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814707","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

Developing Measurement-Informed Methane Emissions Inventory Estimates at Midstream Compressor Stations 在中游压缩站开发测量信息甲烷排放清单估算

ACS ES&T Air Pub Date : 2025-02-28 DOI: 10.1021/acsestair.4c0023710.1021/acsestair.4c00237

Arvind P. Ravikumar*, Hugh Li, Shuting Lydia Yang and Mackenzie L. Smith,

{"title":"Developing Measurement-Informed Methane Emissions Inventory Estimates at Midstream Compressor Stations","authors":"Arvind P. Ravikumar*, Hugh Li, Shuting Lydia Yang and Mackenzie L. Smith, ","doi":"10.1021/acsestair.4c0023710.1021/acsestair.4c00237","DOIUrl":"https://doi.org/10.1021/acsestair.4c00237https://doi.org/10.1021/acsestair.4c00237","url":null,"abstract":"Natural gas transmissions and storage compressor stations account for the largest share of anthropogenic methane (CH4) emissions in New York State (NYS). Yet, NYS’s CH4 emissions inventory is based on measurements that are a decade old and potentially unlikely to be representative of NYS operations. Here, we present results from a comprehensive, multiscale aerial CH4 measurement campaign across all NYS transmission and storage compressor stations. We find a skewed emissions distribution, with 20% of stations accounting for 74% of total CH4 emissions. Emissions at engine-driven compressor stations are, on average, 3–4× higher than emissions at turbine-driven compressor stations, thus demonstrating the need for separate emissions factors for engine- and turbine-drive compressor stations. Overall, measurement-informed emissions inventory from midstream transmission and storage compressor stations in NYS is 72% and 69% lower than the current NYS inventory, respectively. We estimate updated emissions factors of 464 [95% CI: 162–920] metric ton (MT) CH4/station/yr and 139 [97, 191] MT CH4/station/yr for engine- and turbine-based transmission compressor stations, respectively. Similarly, we estimate an updated emissions factor of 413 [164, 733] MT CH4/station/yr for engine-based storage compressor stations. These updated emissions factors, along with improved activity data, enable effective reconciliation of NYS inventory with measured emissions.This study reports on the first large-scale measurement of methane emissions from midstream compressor stations in New York and provides a scalable approach to reconcile and update official emission inventories.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 3","pages":"358–367 358–367"},"PeriodicalIF":0.0,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestair.4c00237","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608907","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

Intermolecular Interactions Enhance the Light Absorption of a Methoxyphenol Constituent of Biomass Burning Emissions 分子间相互作用增强生物质燃烧排放物中甲氧基酚组分的光吸收

ACS ES&T Air Pub Date : 2025-02-27 DOI: 10.1021/acsestair.4c0029410.1021/acsestair.4c00294

Colton T. Calvert, Nathan J. Huskins and Elijah G. Schnitzler*,

{"title":"Intermolecular Interactions Enhance the Light Absorption of a Methoxyphenol Constituent of Biomass Burning Emissions","authors":"Colton T. Calvert, Nathan J. Huskins and Elijah G. Schnitzler*, ","doi":"10.1021/acsestair.4c0029410.1021/acsestair.4c00294","DOIUrl":"https://doi.org/10.1021/acsestair.4c00294https://doi.org/10.1021/acsestair.4c00294","url":null,"abstract":"Brown carbon (BrC) components of biomass burning organic aerosol (BBOA) absorb sunlight at visible wavelengths. However, it is not clear whether the total light absorption of this BrC is simply the sum of the contributions of the individual components or whether the components can bind noncovalently to give additional absorption through charge transfer. Here, intermolecular interactions between guaiacol and quinones (1,4-benzoquinone and 1,4-naphthoquinone) were identified in proxies of the nonpolar, water-insoluble phase of BBOA, using UV–vis spectroscopy. Guaiacol and its derivatives are some of the most abundant emissions of smoldering coniferous species. Enhanced light absorption occurred instantaneously upon mixing colorless guaiacol with either quinone in n-heptane and did not increase with time, in contrast to the absorbance changes that would be expected for a covalent product. This enhancement decreased by about 25% as the temperature increased from 303 to 323 K, consistent with exothermic association to give complexes, yielding enthalpies of complexation of −13.3 ± 0.6 and −12.3 ± 0.4 kJ mol–1 for guaiacol with benzoquinone and naphthoquinone, respectively. Enhancement was also observed upon gas–liquid partitioning of benzoquinone into thin films of guaiacol, for example, with a thickness of 20 μm. This multiphase processing, mimicking partitioning of quinones into liquid BBOA, produced absorption comparable to moderately absorbing BrC from other sources, suggestive of the atmospheric relevance of these interactions.Colorless guaiacol absorbs visible light when complexed with benzoquinone and naphthoquinone, so it is a potential component of brown carbon in biomass burning emissions.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 3","pages":"406–415 406–415"},"PeriodicalIF":0.0,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestair.4c00294","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608959","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

Intermolecular Interactions Enhance the Light Absorption of a Methoxyphenol Constituent of Biomass Burning Emissions. 分子间相互作用增强生物质燃烧排放物中甲氧基酚组分的光吸收。

ACS ES&T Air Pub Date : 2025-02-27 eCollection Date: 2025-03-14 DOI: 10.1021/acsestair.4c00294

Colton T Calvert, Nathan J Huskins, Elijah G Schnitzler

{"title":"Intermolecular Interactions Enhance the Light Absorption of a Methoxyphenol Constituent of Biomass Burning Emissions.","authors":"Colton T Calvert, Nathan J Huskins, Elijah G Schnitzler","doi":"10.1021/acsestair.4c00294","DOIUrl":"10.1021/acsestair.4c00294","url":null,"abstract":"Brown carbon (BrC) components of biomass burning organic aerosol (BBOA) absorb sunlight at visible wavelengths. However, it is not clear whether the total light absorption of this BrC is simply the sum of the contributions of the individual components or whether the components can bind noncovalently to give additional absorption through charge transfer. Here, intermolecular interactions between guaiacol and quinones (1,4-benzoquinone and 1,4-naphthoquinone) were identified in proxies of the nonpolar, water-insoluble phase of BBOA, using UV-vis spectroscopy. Guaiacol and its derivatives are some of the most abundant emissions of smoldering coniferous species. Enhanced light absorption occurred instantaneously upon mixing colorless guaiacol with either quinone in n-heptane and did not increase with time, in contrast to the absorbance changes that would be expected for a covalent product. This enhancement decreased by about 25% as the temperature increased from 303 to 323 K, consistent with exothermic association to give complexes, yielding enthalpies of complexation of -13.3 ± 0.6 and -12.3 ± 0.4 kJ mol-1 for guaiacol with benzoquinone and naphthoquinone, respectively. Enhancement was also observed upon gas-liquid partitioning of benzoquinone into thin films of guaiacol, for example, with a thickness of 20 μm. This multiphase processing, mimicking partitioning of quinones into liquid BBOA, produced absorption comparable to moderately absorbing BrC from other sources, suggestive of the atmospheric relevance of these interactions.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 3","pages":"406-415"},"PeriodicalIF":0.0,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11915197/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143665792","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