ACS Earth and Space Chemistry最新文献

{"title":"Assessing the Role of Water Monomer in the Atmospheric OH-Initiated Oxidation of Ethylene Oxide","authors":"Daniel Moura,&nbsp;Joel Leitão Nascimento,&nbsp;Tiago Vinicius Alves","doi":"10.1021/acsearthspacechem.6c00196","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.6c00196","url":null,"abstract":"<p>The atmospheric oxidation of ethylene oxide (EtO) byhydroxyl radicals(OH) plays a key role in determining its environmental fate, yet theinfluence of water vapor on this process remains poorly understood.Here, we present a detailed theoretical investigation of both gas-phaseand water-mediated mechanisms for the EtO + OH reaction. A comprehensiveexploration of the potential energy surface was performed at the M06-2X/def2-TZVPPlevel, revealing the formation of prereactive complexes and multiplereaction pathways, including cooperative effects induced by a singlewater molecule. Kinetic parameters were evaluated using canonicalvariational theory with small-curvature tunneling (CVT/SCT) withina pre-equilibrium framework. The calculated gas-phase rate constantsare in excellent agreement with recent experimental measurements.Effective rate constants, obtained by incorporating atmospheric waterconcentrations, indicate that the contribution of water-assisted pathwaysremains minor over the 200–400 K temperature range. Under typicaltropospheric conditions, the oxidation process is therefore dominatedby the gas-phase mechanism.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"10 9","pages":"1987–1992"},"PeriodicalIF":2.6,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148985285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mainstream Lunar Regolith Simulants Incompletely Represent Lunar Bulk Chemistry─A Subcompositional Analysis of Lunar Prospector GRS Data","authors":"Aenghus C. Denvir,&nbsp;Harrison R. Coker,&nbsp;Borja B. Barcenilla,&nbsp;Julie A. Howe","doi":"10.1021/acsearthspacechem.6c00195","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.6c00195","url":null,"abstract":"<p>Regolith simulants are substrates designed to mimic thesurfaceregolith of planetary bodies and are commonly used in the design andtesting of in situ resource utilization (ISRU) technologies for engineering,construction, precious materials extraction, and life support. Whilenumerous regolith simulants have been designed since the Apollo missionsand methods of quantifying simulant accuracy have been developed,no analysis has yet been done to make a global map of the most chemicallyaccurate simulant for each region of the moon. By conducting an Aitchisonnearest neighbor analysis of compositional bulk chemical data of commonlyused simulants and Lunar Prospector Gamma Ray Spectrometer data, 2°by 2° tiles of the lunar surface were assigned the chemicallyclosest simulant. A Monte Carlo analysis was further conducted todetermine the robustness of each simulant assignment. With Lunar Prospectorpoints having an average closest simulant assignment Monte Carlo probabilityof 0.44 and a standard deviation of 0.21, analyzed simulants had generallylow success in completely representing the bulk chemistry of the lunarsurface. Highland simulant NU-LHT-2 M and mare simulant LMS-1/LMS-2were notable exceptions, having both wide geographic spread and comparativelyhigh robustness values. A confusion matrix analysis revealed thatthese simulants were compositionally interchangeable even for tilesnominally represented by other simulants. Nonetheless, the developmentof broad highland and mare simulants has left much of the lunar surface,such as regions with low and very high Al₂O₃, very high FeO, high CaO, and high TiO₂, closely unrepresentedby any simulant. Bulk chemistry remote sensing data should be consideredas <em>a</em> factor for simulant development in additionto traditional data sources such as returned samples, and the compositionaldata approach should be used in conjunction with classical metricssuch as the Figure of Merit (FoM) to provide a comprehensive assessmentof simulant accuracy. Moreover, simulants should be focused on specificregions of interest to better test ISRU technologies since the useof nonrepresentative or generalized simulants will skew the performanceof such technologies.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"10 9","pages":"2129–2138"},"PeriodicalIF":2.6,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148985322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Increased Viscosity of Submicron Biomass-Burning Organic Aerosol after Photochemical Aging","authors":"Katherine R. A. Kolozsvari,&nbsp;Natasha M. Garner,&nbsp;Emily J. Costa,&nbsp;Yanfang Chen,&nbsp;Yiwei Gong,&nbsp;Ryan D. Davis,&nbsp;André S. H. Prévôt,&nbsp;Imad El Haddad,&nbsp;Markus Ammann,&nbsp;David M. Bell,&nbsp;Andrew P. Ault","doi":"10.1021/acsearthspacechem.6c00181","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.6c00181","url":null,"abstract":"<p>Biomass burning (BB)is a major global source of atmospheric aerosols.BB primary organic aerosol (BB-POA) particles vary based on fuel andburning conditions, leading to differences in particle-to-particlecomposition, even from a single burning event. In addition to BB-POAparticles, BB emits volatile organic compounds (VOCs), which can beoxidized to form lower-volatility species that condense onto or reactwith POA to form secondary organic aerosol (SOA). Aerosol viscosityimpacts aging processes by changing mixing time scales and is highlydependent on chemical composition, but little is known about BBOAviscosity at the single-particle level and the impacts of BB-SOA formation.We generated BB-POA and BB-SOA using a wood-burning stove connectedto an atmospheric simulation chamber. Particle viscosity was calculatedfrom direct measurements of individual particle melting temperatures(<em>T</em>_m) using nanothermal analysis (NanoTA),an atomic force microscopy (AFM)-based thermal technique. Additionally,bulk BBOA composition was determined by extractive electrospray ionizationtime-of-flight mass spectrometry (EESI-ToF) and used to calculatepredicted <em>T</em>_m, viscosity, and mixing timescales. Overall, BBOA after photochemical aging (BB-POA+SOA) had significantlyhigher measured <em>T</em>_m values than BB-POA,leading to higher viscosity predictions. AFM-photothermal infrared(AFM-PTIR) spectra indicated both inter- and intraparticle chemicalheterogeneity. Viscosities predicted from EESI-ToF measurements alsoincreased after photochemical aging but underestimated the measurement-derivedviscosities under both conditions. Our results indicate that agedparticles within biomass burning plumes in the atmosphere may be moreviscous than anticipated during much of their atmospheric lifetimeswith implications for aerosol processes over large spatial scales.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"10 9","pages":"2094–2105"},"PeriodicalIF":2.6,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148980784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbonate Protection Regulates Effective Preservation of Labile Active Substances over a Centennial Time Scale in a Carbonate-Type Lake","authors":"Hailong Liu,&nbsp;Jingyi Zhang,&nbsp;Chu Zhao,&nbsp;Fan Yang,&nbsp;Changchun Huang,&nbsp;Jiahong Zhou","doi":"10.1021/acsearthspacechem.6c00166","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.6c00166","url":null,"abstract":"<p>Inlake ecosystems, the carbonate–organic matter interactionforms a selective protective effect on specific organic matter. Thekey to understanding the selective protection mechanism of carbonatesis to clarify the compositional characteristics of organic matterunder carbonate regulation. In this study, sediment from Daru Co Lakeon the Qinghai–Tibet Plateau was used as the research object,and the molecular structural characteristics of organic matter buriedby carbonates were determined using high-resolution mass spectrometryand X-ray photoelectron spectroscopy (XPS). The results showed that,over the nearly 100 year period (1928–2015), the main componentsof organic matter buried by carbonates included not only the classicallyrefractory macromolecule lignin (32.2%) but also labile active substances,such as proteins (29.1%) and lipids (18.8%). This results suggeststhat, in carbonate lake environments, carbonates can actively capturelabile organic matter and form stable associations, allowing labileorganic matter to undergo long-term geological sequestration underthe protection of inorganic minerals instead of being inevitably rapidlymineralized.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"10 9","pages":"2062–2071"},"PeriodicalIF":2.6,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148985222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiolytic Production, Trapping, and Desorption of H2 at Elevated Temperatures in Amorphous and Crystalline Astrophysical and Planetary H2O Ice Analogs","authors":"Rahul K. Kushwaha,&nbsp;Murthy S. Gudipati,&nbsp;Bryana L. Henderson","doi":"10.1021/acsearthspacechem.6c00205","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.6c00205","url":null,"abstract":"<p>We have conducted a comprehensive study on trapping andsublimationof H₂ in H₂O ice. The results demonstrate thatcodeposited H₂:H₂O ices (1:5) at 7 K releaseH₂ in two temperature regions during temperature-programmeddesorption (TPD), at ∼25 K and ∼80 K, whereas H₂ produced in H₂O ices via electron irradiationis released in three regions, at ∼25 K, ∼80 K, and ∼110K. The higher the electron energy, the greater the amount of H₂ trapped in and released from H₂O ice at ∼110K. Following irradiation, the ∼80 K release of H₂ is observed in amorphous but not crystalline ice. To better understandthe trapping and release behavior of H₂ in H₂O ice, we carried out systematic laboratory studies under differentastrophysical and planetary conditions, as presented here, and comparedthem with previous studies. The implications of our work will rangefrom outgassing from cometary nuclei, protoplanetary disk ice chemistry,nongravitational acceleration of interstellar objects such as 1I/′Oumuamua,and outgassing of H₂ from irradiated icy bodies such asEuropa and Enceladus in the solar system. Our work also infers radiolyticproduction and storage of H₂ in the lunar permanently shadowedregions.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"10 9","pages":"2139–2150"},"PeriodicalIF":2.6,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148985286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Forecasting HFC-R134a Trends Amidst Global Warming: A Comparative Study of Residual Transformers and Attention-Based RNNs for Middle-Term Projections","authors":"Ali Toprak,&nbsp;Ihsan Uluocak","doi":"10.1021/acsearthspacechem.6c00182","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.6c00182","url":null,"abstract":"<p>The continuous accumulation of hydrofluorocarbons (HFCs),particularlyR134a (1,1,1,2-Tetrafluoroethane), poses a significant challenge toglobal climate mitigation efforts due to its high global warming potential.Accurate modeling of its atmospheric trajectory is complicated bynonstationary growth trends and hemispheric mixing asymmetries. Thisstudy introduces a novel deep learning framework to model and projectR134a concentrations using high-resolution data sets from the Arctic(Barrow, Alaska) and Antarctic (South Pole) stations (1994–2025).Three parallel architectures are offered Attention-Based LSTM, Attention-BasedGRU, and a Residual Transformer Encoder. To ensure robust generalization,hyperparameter tuning was conducted via Bayesian Optimization usingan expanding window cross-validation strategy. Empirical results demonstratethat the Residual Transformer significantly outperforms recurrentarchitectures, achieving the lowest mean absolute error (MAE &lt;0.34 pmol/mol) and highest determination coefficient of 0.995 acrossboth poles. A crucial finding is the distinct hemispheric disparity;models applied to the Antarctic data set exhibited superior stabilityand lower stochastic volatility compared to the Arctic, reflectingthe impact of anthropogenic source proximity on Northern hemisphereatmospheric dynamics. Furthermore, a computational complexity analysisreveals that while the attention-LSTM is the most resource-efficientsuitable for edge deployment, the residual transformer offers theoptimal accuracy-to-cost ratio, surpassing the computationally expensiveAttention-GRU. Finally, recursive long-term projections (2025–2035)indicate a continued monotonic increase in global R134a concentrations,serving as a baseline reference scenario to support future environmentalassessments and broader atmospheric monitoring efforts.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"10 9","pages":"2106–2115"},"PeriodicalIF":2.6,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148980765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gas-Phase Sulfate Formation from SO2 Hydrolysis: The Enhancing Effect of Amines","authors":"Teklebirhan Arefaine Gebru,&nbsp;Narcisse Tsona Tchinda,&nbsp;Lin Du","doi":"10.1021/acsearthspacechem.6c00215","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.6c00215","url":null,"abstract":"<p>Despite the importance of amines in atmospheric chemistryand aerosolformation, their participation in oxidation reactions remains poorlyunderstood. This work investigates the role of selected amines (dimethylamine,guanidine, putrescine, and piperazine) in SO₂ hydrolysisusing quantum-chemical calculations and kinetic modeling. Resultsshow that amines can significantly promote the transformation of SO₂ to sulfate in a nonradical oxidation mechanism. The reactionproceeds by prior amine-assisted SO₂ hydrolysis to HOSO₂^– clustered to protonated amine (amineH⁺), followed by oxidation by ozone (O₃) to formthe amineH⁺···HSO₄^– ion pair, known to instigate sulfate-aerosol formation. The rateconstants of amineH⁺···HOSO₂^– formation at 298.15 K were determined to be 2.15 ×10^–14, 6.11 × 10^–13, 2.80× 10^–12 and 6.64 × 10^–14 cm³ molecule^–1 s^–1 for dimethylamine, guanidine, putrescine, and piperazine, respectively,found to exhibit negative temperature dependencies in the temperaturerange 200–360 K. These findings show that putrescine and guanidineare the most effective in SO₂ hydrolysis to HOSO₂^–, with rate constants up to 1 order of magnitudehigher than the rate constant of SO₂ + ^•OH → HOSO₂^• reaction. This studyshows that diamines and guanidino compounds would not only outperformalkylamines in facilitating SO₂ hydrolysis, but may alsocompete with the ^•OH-radical-driven SO₂ oxidation, especially under polluted environments. The implicationsof the studied reactions span from effective removal of atmosphericamines to air pollution through sulfate-aerosol formation.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"10 9","pages":"2151–2158"},"PeriodicalIF":2.6,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148980782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adsorption and Transport Behavior of Uranium in the Vadose Zone of Sandy Soils in Arid Regions: A Hydrus-1D Numerical Simulation Study","authors":"Chun Zhang,&nbsp;Haisong Tang,&nbsp;Xiang Zhou,&nbsp;Hao Sun,&nbsp;Yu Wang,&nbsp;He Zhao,&nbsp;Yongyuan Xu","doi":"10.1021/acsearthspacechem.6c00128","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.6c00128","url":null,"abstract":"<p>Uranium (U), a key nuclide in nuclear energy developmentand carbonneutrality strategies, exhibits environmental adsorption and transportbehaviors that directly affect the safety of nuclear waste geologicaldisposal and the long-term risk assessment of contaminated sites.The sandy vadose zone in arid regions of Gansu, China, is a representativemedium for uranium contamination; however, its vertical migrationand retention mechanisms remain poorly quantified. In this study,laboratory column experiments combined with Hydrus-1D simulationswere conducted to investigate the coupled effects of water flow andexperimentally determined linear adsorption on uranium transport ina homogeneous sandy vadose zone. Uranium migrated rapidly downwardby approximately 8 cm within the first 20 days. Scenario simulations(20–50 years) suggest that, under evaporation-driven negativepressure gradients, migration depth stabilizes, with most uraniumretained within the top 7.9 cm. Sensitivity analysis shows that thedispersion coefficient (<em>D</em>_L) and residualwater content (θ_r) are the most influential intrinsicparameters, while the precipitation-evaporation balance is the keyexternal driver controlling long-term retention. Furthermore, rainfall-inducedwetting-drying cycles may promote a shift of uranium toward relativelyless mobile fractions under the Tessier extraction scheme. This studysuggests that, under evaporation-dominated climatic conditions andthe assumptions of the present conceptual model, uranium transportexhibits a trend of rapid initial migration followed by long-termshallow retention, providing quantitative support for scenario-basedassessment of radionuclide transport in homogeneous sandy vadose zones.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"10 9","pages":"2020–2031"},"PeriodicalIF":2.6,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148985160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Can Defective Schreibersite Deliver Prebiotic Phosphorus?","authors":"Stefano Pantaleone,&nbsp;Albert Rimola,&nbsp;Nadia Balucani,&nbsp;Piero Ugliengo","doi":"10.1021/acsearthspacechem.6c00158","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.6c00158","url":null,"abstract":"<p>The origin of bioavailablephosphorus remains one of the majorunresolved questions in prebiotic chemistry. The most widely acceptedhypotheses invoke an exogenous delivery of phosphorus during the ArcheanEon (ca. 4 billion years ago), associated with the Late Heavy Bombardmentand involving the iron–nickel phosphide mineral schreibersite((Fe,Ni)₃P). Over the past decades, these hypotheses havebeen supported by aqueous corrosion experiments, showing that schreibersitereleases a variety of oxygenated phosphorus species, including phosphates.In this work, we investigate the wetting and corrosion of the reactiveschreibersite (001) surface (Fe₂NiP) by means of periodicDFT simulations up to the formation of phosphate species. Unlike previousstudies, which considered only the pristine (001) surface, here weinvestigate defective surface models to assess structural defectsthat facilitate phosphate formation. The results reveal significantchanges in the thermodynamics of the corrosion process, whereas thekinetic barriers remain remarkably similar to those calculated forthe pristine (001) surface, differing by less than 5 kJ mol^–1, well within the intrinsic chemical accuracy of DFT calculations.These findings indicate that the pristine (001) surface provides areliable and robust structural model for investigating phosphate formationand, potentially, more complex prebiotic processes, such as phosphorylationof organic molecules. Consequently, increasingly complex structuralmodels representing advanced stages of corrosion are not required,despite the substantial morphological and compositional changes expectedto occur during surface degradation.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"10 9","pages":"2045–2052"},"PeriodicalIF":2.6,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148980789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generation and Atmospheric Evolution of Light-Absorbing Carbonaceous Aerosol from Thermal Degradation of Plastic","authors":"Asma Soofi,&nbsp;Sithumi M. Liyanage,&nbsp;Christian A. Escritt,&nbsp;Katrina L. Betz,&nbsp;Jace A. Barton,&nbsp;Conner D. Karlik,&nbsp;Elijah G. Schnitzler","doi":"10.1021/acsearthspacechem.6c00130","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.6c00130","url":null,"abstract":"<p>Open burning of plastic waste is a significant sourceof carbonaceousaerosol, including nanoplastics, in the atmosphere. As these particlesare carried downwind, they undergo atmospheric aging through irradiationand oxidation, with potential impacts on their optical propertiesand, in turn, interactions with sunlight. Here, we report measurementsof the initial and dynamic light absorption of carbonaceous aerosolfrom the thermal degradation of plastic, i.e., polyethylene terephthalateglycol (PETG). Four colors (red, yellow, blue, and colorless) of PETGwere selected for thermal degradation in a tube furnace across a widerange of temperatures. The generation of submicron particles was confirmedusing a scanning mobility particle sizer. Carbonaceous aerosol wascollected on filters for characterization and aging experiments. Characterizationincluded infrared and visible spectroscopy for composition and absorption,respectively, and colorimetry. Depending on the combustion conditions,the aerosol ranged from organic to elemental (i.e., black) carbon.The organic aerosol included polymer and nonpolymer species, distinguishedusing infrared spectroscopy. Selected light-absorbing organic aerosolsamples from red and yellow PETG underwent irradiation in a solarsimulator and oxidation in a flow tube with ozone at 50 ppb. The organicaerosol lost absorption more through irradiation than ozone oxidation;i.e., 1 d of irradiation led to a significant, 50% decrease for samplesfrom both red and yellow PETG. Together, the results demonstrate thatthe initial absorption of carbonaceous aerosol from open burning ofplastics varies significantly and that the absorption of light-absorbingorganic aerosol at moderate temperatures is highly dynamic upon atmosphericaging.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"10 9","pages":"2010–2019"},"PeriodicalIF":2.6,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148985258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}