Revealing Brown Carbon Chromophores Produced in Reactions of Methylglyoxal with Ammonium Sulfate

Environmental Science & Technology, Journal Year: 2015, Volume and Issue: 49(24), P. 14257 - 14266

Published: Oct. 27, 2015

Atmospheric brown carbon (BrC) is an important contributor to light absorption and climate forcing by aerosols. Reactions between small water-soluble carbonyls ammonia or amines have been identified as one of the potential pathways BrC formation. However, detailed chemical characterization chromophores has challenging their formation mechanisms are still poorly understood. Understanding impeded lack suitable methods which can unravel variability complexity mixtures. This study applies high performance liquid chromatography (HPLC) coupled photodiode array (PDA) detector resolution mass spectrometry (HRMS) investigate optical properties composition individual components produced through reactions methylglyoxal (MG) ammonium sulfate (AS), both abundant in atmospheric environment. A direct relationship 30 major established. Nearly all these nitrogen-containing compounds that account for >70% overall MG+AS system 300–500 nm range. These results suggest reduced-nitrogen organic formed ammonia/amines chromophores. It also demonstrated improved separation HPLC will significantly advance understanding chemistry.

Language: Английский

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Recent Discoveries and Future Challenges in Atmospheric Organic Chemistry

Environmental Science & Technology, Journal Year: 2016, Volume and Issue: 50(6), P. 2754 - 2764

Published: Feb. 11, 2016

ADVERTISEMENT RETURN TO ISSUEPREVFeatureNEXTRecent Discoveries and Future Challenges in Atmospheric Organic ChemistryMarianne Glasius*† Allen H. Goldstein‡View Author Information† Department of Chemistry iNANO, Aarhus University, 8000 C, Denmark‡ Environmental Science, Policy Management, Civil Engineering, University California, Berkeley, California 94720, United States*Phone: +45-87155923; e-mail: [email protected]Cite this: Environ. Sci. Technol. 2016, 50, 6, 2754–2764Publication Date (Web):February 10, 2016Publication History Published online26 February 2016Published inissue 15 March 2016https://pubs.acs.org/doi/10.1021/acs.est.5b05105https://doi.org/10.1021/acs.est.5b05105newsACS PublicationsCopyright © 2016 American Chemical Society. This publication is available under these Terms Use. Request reuse permissions free to access through this site. Learn MoreArticle Views10379Altmetric-Citations137LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum full text article downloads since November 2008 (both PDF HTML) across all institutions individuals. These metrics regularly updated reflect usage leading up last few days.Citations number other articles citing article, calculated by Crossref daily. Find more information about citation counts.The Altmetric Attention Score a quantitative measure attention that research has received online. Clicking on donut icon will load page at altmetric.com with additional details score social media presence for given article. how calculated. Share Add toView InAdd Full Text ReferenceAdd Description ExportRISCitationCitation abstractCitation referencesMore Options onFacebookTwitterWechatLinked InRedditEmail (1 MB) Get e-AlertscloseSUBJECTS:Aerosols,Deposition,Organic compounds,Oxidation,Volatile organic compounds e-Alerts

Language: Английский

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Predicting the glass transition temperature and viscosity of secondary organic material using molecular composition

Atmospheric chemistry and physics, Journal Year: 2018, Volume and Issue: 18(9), P. 6331 - 6351

Published: May 4, 2018

Abstract. Secondary organic aerosol (SOA) accounts for a large fraction of submicron particles in the atmosphere. SOA can occur amorphous solid or semi-solid phase states depending on chemical composition, relative humidity (RH), and temperature. The transition between occurs at glass temperature (Tg). We have recently developed method to estimate Tg pure compounds containing carbon, hydrogen, oxygen atoms (CHO compounds) with molar mass less than 450 g mol−1 based their atomic O : C ratio. In this study, we refine extend CH CHO up ∼ 1100 using number atoms. predict viscosity from Tg-scaled Arrhenius plot fragility (viscosity vs. Tg∕T) as function parameter D. compiled D values literature found that approaches lower limit 10 (±1.7) increases. estimated α-pinene isoprene RH by accounting hygroscopic growth applying Gordon–Taylor mixing rule, reproducing previously published experimental measurements very well. Sensitivity studies were conducted evaluate impacts Tg, D, hygroscopicity (κ), constant predictions. toluene was predicted elemental composition obtained high-resolution spectrometry (HRMS), resulting good agreement measured viscosity. also biomass burning HRMS two different ionization techniques: electrospray (ESI) atmospheric pressure photoionization (APPI). Due differences detected signal intensity, viscosities low ESI APPI differ 2–5 orders magnitude. Complementary are desired further constrain RH-dependent future studies.

Language: Английский

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Chemical Characterization of Secondary Organic Aerosol from Oxidation of Isoprene Hydroxyhydroperoxides

Environmental Science & Technology, Journal Year: 2016, Volume and Issue: 50(18), P. 9889 - 9899

Published: July 28, 2016

Atmospheric oxidation of isoprene under low-NOx conditions leads to the formation hydroxyhydroperoxides (ISOPOOH). Subsequent ISOPOOH largely produces epoxydiols (IEPOX), which are known secondary organic aerosol (SOA) precursors. Although SOA from IEPOX has been previously examined, systematic studies characterization through a non-IEPOX route 1,2-ISOPOOH lacking. In present work, authentic was systematically examined with varying compositions and relative humidity. High yields highly oxidized compounds, including multifunctional organosulfates (OSs) hydroperoxides, were chemically characterized in both laboratory-generated fine samples collected southeastern U.S. IEPOX-derived constituents observed all experiments, but their concentrations only enhanced presence acidified sulfate aerosol, consistent prior work. High-resolution mass spectrometry (HR-AMS) reveals that 1,2-ISOPOOH-derived formed routes exhibits notable spectrum characteristic fragment ion at m/z 91. This is strongly correlated factor recently resolved by positive matrix factorization (PMF) spectrometer data areas dominated emissions, suggesting pathway could contribute ambient measured Southeastern United States.

Language: Английский

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The fuel of atmospheric chemistry: Toward a complete description of reactive organic carbon

Science Advances, Journal Year: 2020, Volume and Issue: 6(6)

Published: Feb. 6, 2020

Tracking reactive organic carbon in the atmosphere is critical to advancing our understanding of air quality and climate.

Language: Английский

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Modeling the formation and growth of atmospheric molecular clusters: A review

Journal of Aerosol Science, Journal Year: 2020, Volume and Issue: 149, P. 105621 - 105621

Published: July 3, 2020

Language: Английский

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Secondary organic aerosol formed by condensing anthropogenic vapours over China’s megacities

Nature Geoscience, Journal Year: 2022, Volume and Issue: 15(4), P. 255 - 261

Published: April 1, 2022

Language: Английский

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Acidity and the multiphase chemistry of atmospheric aqueous particles and clouds

Atmospheric chemistry and physics, Journal Year: 2021, Volume and Issue: 21(17), P. 13483 - 13536

Published: Sept. 10, 2021

Abstract. The acidity of aqueous atmospheric solutions is a key parameter driving both the partitioning semi-volatile acidic and basic trace gases their aqueous-phase chemistry. In addition, phases, e.g., deliquesced aerosol particles, cloud, fog droplets, also dictated by These feedbacks between chemistry have crucial implications for tropospheric lifetime air pollutants, composition, deposition to terrestrial oceanic ecosystems, visibility, climate, human health. Atmospheric research has made substantial progress in understanding multiphase during recent decades. This paper reviews current state knowledge on these with focus cloud systems, which involve inorganic organic Here, we describe impacts phase buffering phenomena. Next, review different regimes chemical reaction mechanisms kinetics, as well uncertainties subsystems incomplete information. Finally, discuss highlight need future investigations, particularly respect reducing emissions acid precursors changing world, advancements field laboratory measurements model tools.

Language: Английский

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Brown carbon from biomass burning imposes strong circum-Arctic warming

One Earth, Journal Year: 2022, Volume and Issue: 5(3), P. 293 - 304

Published: March 1, 2022

Rapid warming in the Arctic has a huge impact on global environment. Atmospheric brown carbon (BrC) is one of least understood and uncertain agents due to scarcity observations. Here, we performed direct observations atmospheric BrC quantified its light-absorbing properties during 2-month circum-Arctic cruise summer 2017. Through observation-constrained modeling, show that BrC, mainly originated from biomass burning mid- high latitudes Northern Hemisphere (∼60%), can be strong agent region, especially summer, with an average radiative forcing ∼90 mW m−2 (∼30% relative black carbon). As climate change projected increase frequency, intensity, spread wildfires, expect play increasing role future.

Language: Английский

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Regioisomeric effect of heteroatoms and functional groups of organic ligands: Impacts on coordination bonding and corrosion protection performance

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 515, P. 215966 - 215966

Published: May 20, 2024

The regioisomeric effect, which refers to the different positions of heteroatoms and functional groups on a molecule, significantly impacts stability, physicochemical properties, chemical reactivity, coordination bonding organic compounds. These effects are critical for their commercial applications, notably in corrosion inhibition. Regioisomeric ligands, with unique spatial configurations groups, influence ability establish stable interactions metal surfaces. Certain regioisomers may exhibit enhanced affinity adsorption capacities based structural configurations, thereby facilitating formation more durable protective layer substrate. This review explores impact regioisomerism inhibition performance A literature survey reveals that identical substituents (e.g., –OH, –NH2, –COOH, –NO2, –OR), multiple bonds >CC< –CC–), or N, O, S) at varying diverse capabilities efficiencies. detailed analysis indicates certain regioisomers, due strategic placement achieve increased stability form relatively stronger complexes. enhances effectiveness chelation mechanisms. role group has been seldom observed documented previous studies. current research also underscores significance determining ligands. thorough understanding will assist scientists engineers developing effective inhibitors.

Language: Английский

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