ACS Earth and Space Chemistry最新文献

{"title":"Dual-Domain Regulation of Dissolved Organic Matter Release in Soil: The Role of pH and Calcium","authors":"Hui Gao,&nbsp;Liping Weng*,&nbsp;Rob N. J. Comans and Gerwin F. Koopmans,&nbsp;","doi":"10.1021/acsearthspacechem.4c0037710.1021/acsearthspacechem.4c00377","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.4c00377https://doi.org/10.1021/acsearthspacechem.4c00377","url":null,"abstract":"<p >Dissolved organic matter (DOM), being the most reactive soil organic matter (SOM) fraction, affects key biogeochemical processes in soil like nutrient cycling, pollutant transport, and organic carbon sequestration. Quantitative understanding of physical-chemical processes regulating the release of DOM in response to variation in factors such as pH and Ca concentration is still lacking. Here, we conducted batch experiments and employed the Natural Organic Matter-Charge Distribution (NOM-CD) model and the Non-Ideal Consistent Competitive Adsorption-Donnan (NICA-Donnan) model to investigate the physical-chemical processes controlling DOM release in seven agricultural topsoils under varying pH (3–9) and Ca concentration (0–10 mM). The DOM fractionation results showed that while hydrophilic acid (Hy), fulvic acid (FA), and humic acid (HA) concentrations increased with pH, their contribution to total DOM differed: Hy and HA dominated at respectively low pH (∼4–6) and high pH (∼8–9), whereas FA peaked at near-neutral pH (∼6.5–7). Our NOM-CD model calculations revealed that changes in the DOM concentration at low pH (pH &lt; ∼5–6.5) were mainly due to OM desorption from soil minerals. Changes in the DOM concentration at high pH (pH &gt; ∼5–6.5) were predominantly controlled by OM dissolution, as demonstrated by the relation between the DOM concentration and Donnan potential (φ_D) of DOM calculated with the NICA-Donnan model. Based on these findings, we propose a conceptual Dual-Domain Desorption Dissolution model in which the relative importance of these two controlling mechanisms is quantitatively assessed for the first time. These insights will be helpful to better quantify soil management effects on the stability and functioning of SOM.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"9 6","pages":"1377–1391 1377–1391"},"PeriodicalIF":2.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsearthspacechem.4c00377","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Noble Gases in Archean Barites: Precise Determination of the Isotopic Fractionation of Atmospheric Xenon 3.48 Ga Ago.","authors":"Guillaume Avice, Helge Mißbach-Karmrodt, Félix Vayrac, Joachim Reitner","doi":"10.1021/acsearthspacechem.4c00356","DOIUrl":"10.1021/acsearthspacechem.4c00356","url":null,"abstract":"<p><p>Following the evolution of the composition of the atmosphere informs on the entire geological evolution of our planet. The discovery that Archean atmospheric xenon was isotopically fractionated compared to modern atmospheric xenon paved the way for using this noble gas as a tracer of hydrogen escape on the primitive Earth. The curve of the evolution of the isotopic composition of atmospheric xenon remains, however, poorly defined. Recent studies proposed that the evolution was discontinuous with brief episodes of escape and fractionation of xenon separated by up to several 100 Ma long pauses. Similarly, some major unknowns remain regarding the progressive depletion of xenon in the atmosphere due to the proposed escape mechanism. In this study, we report the noble gas elemental ratios and isotopic compositions of noble gases released from a ca. 3.48 Ga old barite sample from the Dresser Formation (North Pole, Australia) by stepwise crushing in high vacuum. All samples released xenon enriched in light isotopes relative to heavy isotopes compared to modern atmospheric xenon but with various degrees of isotopic fractionation. Krypton is enriched in heavy isotopes relative to light isotopes in some crushed samples. After correction for Kr and Xe loss, results show that 3.48 Ga ago atmospheric xenon was fractionated by -19.1 ± 1.8‰ per atomic mass unit (u^-1). This value is more negative than that reported previously for 3.3 Ga old atmospheric xenon. A new curve for the evolution of the isotopic composition of atmospheric xenon is proposed. Xenon is also enriched relative to Kr in the gas released from the measured samples. While this is consistent with the scenario of a progressive selective escape of xenon from the Archean atmosphere, the exact abundance of Xe in the paleoatmosphere remains elusive.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"9 6","pages":"1367-1376"},"PeriodicalIF":2.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12183778/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144482515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Secondary Organic Aerosol Formation in the Tropical Coastal Atmosphere: Impact of Land- and Sea-Breeze Circulations","authors":"Suresh Kumar Reddy Boreddy*,&nbsp;Parvathy Anand,&nbsp;Dhananjay Kumar,&nbsp;Prashant Hegde and S. Suresh Babu,&nbsp;","doi":"10.1021/acsearthspacechem.5c0002810.1021/acsearthspacechem.5c00028","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.5c00028https://doi.org/10.1021/acsearthspacechem.5c00028","url":null,"abstract":"<p >The present study investigates secondary organic aerosol (SOA) formation in the tropical coastal atmosphere (Thumba: 8.5° N, 76.9° E, ∼3 m a.s.l.) in India during sea-breeze (SB) and land-breeze (LB) circulations by analyzing water-soluble organic compounds using gas chromatography (GC). The molecular distribution of organic compounds is characterized by a predominance of oxalic acid (C₂) during both circulations, with higher abundance during LB. While phthalic (Ph; an oxidation product of aromatics) and azelaic (C₉; an oxidation product of unsaturated fatty acids) acids are the next most abundant compounds during SB, terephthalic acid (tPh; a tracer of plastic-burning) is the second most dominant compound during LB. As markers of photochemical activity, the ratios of fumaric-to-maleic (F/M) and malonic-to-succinic (C₃/C₄) acids are doubled during SB. In contrast, C₂/Σ(C₂ – C₁₀) and water-soluble organic carbon (WSOC)/organic carbon (OC) ratios are higher during LB, suggesting secondary oxidation in an aqueous medium. The ISORROPIA II model’s results show that, consistent with relative humidity levels, aerosol-liquid water content (ALWC) in LB is 7 times larger than in SB. The 18-fold rise in the tPh/C₉ ratio during LB suggests a significant quantity of organics originated from plastic burning. Based on diagnostic mass ratios of organic and inorganic tracer compounds and their relationships, the present study emphasizes that SOA formation in the coastal atmosphere is likely caused by photochemical processes of marine-derived-organic precursors, such as unsaturated fatty acids and hydrolysis of phthalates, and related biogenic precursors during SB. However, the aqueous-phase formation of SOA relates to human-induced pollutants, including plastic burning dominant during LB. The impact of inorganics on daytime photooxidation of organic acids is also discussed.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"9 6","pages":"1566–1579 1566–1579"},"PeriodicalIF":2.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312441","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":"Noble Gases in Archean Barites: Precise Determination of the Isotopic Fractionation of Atmospheric Xenon 3.48 Ga Ago","authors":"Guillaume Avice*,&nbsp;Helge Mißbach-Karmrodt,&nbsp;Félix Vayrac and Joachim Reitner,&nbsp;","doi":"10.1021/acsearthspacechem.4c0035610.1021/acsearthspacechem.4c00356","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.4c00356https://doi.org/10.1021/acsearthspacechem.4c00356","url":null,"abstract":"<p >Following the evolution of the composition of the atmosphere informs on the entire geological evolution of our planet. The discovery that Archean atmospheric xenon was isotopically fractionated compared to modern atmospheric xenon paved the way for using this noble gas as a tracer of hydrogen escape on the primitive Earth. The curve of the evolution of the isotopic composition of atmospheric xenon remains, however, poorly defined. Recent studies proposed that the evolution was discontinuous with brief episodes of escape and fractionation of xenon separated by up to several 100 Ma long pauses. Similarly, some major unknowns remain regarding the progressive depletion of xenon in the atmosphere due to the proposed escape mechanism. In this study, we report the noble gas elemental ratios and isotopic compositions of noble gases released from a ca. 3.48 Ga old barite sample from the Dresser Formation (North Pole, Australia) by stepwise crushing in high vacuum. All samples released xenon enriched in light isotopes relative to heavy isotopes compared to modern atmospheric xenon but with various degrees of isotopic fractionation. Krypton is enriched in heavy isotopes relative to light isotopes in some crushed samples. After correction for Kr and Xe loss, results show that 3.48 Ga ago atmospheric xenon was fractionated by −19.1 ± 1.8‰ per atomic mass unit (u^–1). This value is more negative than that reported previously for 3.3 Ga old atmospheric xenon. A new curve for the evolution of the isotopic composition of atmospheric xenon is proposed. Xenon is also enriched relative to Kr in the gas released from the measured samples. While this is consistent with the scenario of a progressive selective escape of xenon from the Archean atmosphere, the exact abundance of Xe in the paleoatmosphere remains elusive.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"9 6","pages":"1367–1376 1367–1376"},"PeriodicalIF":2.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsearthspacechem.4c00356","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Online Speciation of Glyoxal Multiphase Reactions on Deliquesced Ammonium Sulfate Particles","authors":"Nicolas Brun*,&nbsp;Anil Kumar Mandariya,&nbsp;Junteng Wu,&nbsp;Francesco Battaglia,&nbsp;Jian Xu,&nbsp;Manon Rocco,&nbsp;Laurent Poulain,&nbsp;Mathieu Cazaunau,&nbsp;Antonin Berge,&nbsp;Edouard Pangui,&nbsp;Brice Temime-Roussel,&nbsp;Bénédicte Picquet-Varrault,&nbsp;Jean-Louis Clément,&nbsp;Aline Gratien,&nbsp;Paola Formenti,&nbsp;Liang Wen,&nbsp;Thomas Schaefer,&nbsp;Andreas Tilgner,&nbsp;Hartmut Herrmann,&nbsp;Jean-François Doussin and Anne Monod*,&nbsp;","doi":"10.1021/acsearthspacechem.4c0036910.1021/acsearthspacechem.4c00369","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.4c00369https://doi.org/10.1021/acsearthspacechem.4c00369","url":null,"abstract":"<p >The reaction between glyoxal and ammonia in bulk Ammonium Sulfate (AS) aqueous solutions is known to be slow under acidic conditions, limiting its atmospheric relevance in wet acidic aerosol conditions. However, previous chamber experiments observed the formation of chromophores during the reactive uptake of gaseous glyoxal on ammonium sulfate particles within minutes. The mechanisms remained unresolved due to the lack of organic speciation and the Relative Humidity (RH) did not allow the seed particles to deliquesce. This study presents chemical speciation of the gas and the particle phases during the uptake of gaseous glyoxal on deliquesced AS seed particles (RH ≥ 80 ± 3%) in the CESAM simulation chamber. The chemical speciation of the particles was performed using AMS measurements complemented by a CHARON-PTR-ToF-MS. The influence of H₂O₂ addition, seed acidity and UV–vis photolysis was explored. Fast reactive uptake of gaseous glyoxal on AS particles was consistently observed in all experiments. The combined measurements from the two mass spectrometers enabled source apportionment analysis through positive matrix factorization of the AMS data and led to the identification and quantification of three dominant processes: (i) glyoxal hydration, (ii) fast dark aging of glyoxal, including the formation of brown carbon and (iii) photochemical aging. The CHARON-PTR-ToF-MS allowed the identification of individual products, such as oxazole and imidazole-2-carboxaldehyde, appearing within minutes during the chamber experiments. A detailed mechanism of glyoxal uptake was proposed, highlighting significant differences in kinetics and dominant reaction pathways compared to the glyoxal reactivity in the bulk aqueous phase.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"9 6","pages":"1350–1366 1350–1366"},"PeriodicalIF":2.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312419","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 of REEs to Kaolinite via Ion Exchange and Surface Complexation as a Function of Water Chemistry","authors":"Elmira Ramazanova,&nbsp;Neha Sharma,&nbsp;Elaine D. Flynn,&nbsp;Olwen Stagg,&nbsp;Jeffrey G. Catalano and Daniel E. Giammar*,&nbsp;","doi":"10.1021/acsearthspacechem.4c0038910.1021/acsearthspacechem.4c00389","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.4c00389https://doi.org/10.1021/acsearthspacechem.4c00389","url":null,"abstract":"<p >Rare earth elements (REEs) are critical components of modern technology behind renewable energy, transportation, and electronics but have a limited current supply. A substantial portion of global REE production relies on ion adsorption deposits. A high abundance of kaolinite in REE enrichment zones within these deposits suggests that kaolinite controls the subsurface migration of REEs. This study aimed to improve the current understanding of REE binding to kaolinite under varying water chemistry conditions. We conducted batch experiments with kaolinite (KGa-2) and three REEs (Nd, Dy, and Yb) at varying pH, electrolyte concentration, dissolved inorganic carbon (DIC), low molecular weight organic acids (citric and oxalic acids), and total REE concentration conditions. Increasing electrolyte concentration inhibits REE adsorption at pH &lt; 7, suggesting that ion exchange contributes to adsorption at these pH values. DIC affects adsorption above pH 7–8 by forming strong aqueous complexes with heavy REEs. Citric acid decreases REE adsorption via aqueous complexation of REEs at pH &gt; 5 but does not affect adsorption at pH &lt; 5. The surface complexation model captures the main adsorption trends with two mechanisms: ion exchange on basal planes at pH &lt; ∼6 and inner-sphere surface complexation to edge sites at pH &gt; ∼6. Equilibrium constants for surface complexation increase in the order of Yb &gt; Dy &gt; Nd, indicating a higher strength of adsorption for heavy REEs. This study demonstrates how water chemistry conditions control the adsorption mechanisms that may determine the mobility of REEs in subsurface environments rich in kaolinite.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"9 6","pages":"1430–1442 1430–1442"},"PeriodicalIF":2.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312418","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":"Molecular Characterization of Nascent and Aged Sea Spray Aerosol.","authors":"Dilini K Gamage, Elias Hasenecz, Glorianne P Dorcé, Kathryn J Mayer, Jon S Sauer, Christopher Lee, Kimberly A Prather, Elizabeth A Stone","doi":"10.1021/acsearthspacechem.4c00412","DOIUrl":"10.1021/acsearthspacechem.4c00412","url":null,"abstract":"<p><p>The chemical aging of sea spray aerosol (SSA) was examined in the Sea Spray Chemistry and Particle Evolution (SeaSCAPE) experiment in which nascent SSA particles were generated from seawater by breaking waves in a glass wave channel. Particles and gases in the air in the wave channel headspace were aged in an oxidative flow reactor. Nascent SSA (before reaction) and aged SSA (after reaction) particles were chemically analyzed for inorganic ions, organic carbon (OC), and select organic species, including organosulfates, fatty acids, and alkyl amines. Nascent SSA mass primarily consisted of inorganic ions associated with sea salt. On average, OC accounted for 52% of particle mass <0.25 μm and 0.2% of mass in both supermicron and submicron particles, with an increase in OC relative to Na⁺ with decreasing particle size. The aging process increased the sulfate, phosphate, nitrate, ammonium, and OC concentrations relative to sodium. The largest increases in the sulfate and OC to Na⁺ ratios (by factors of 7 and 5) in aged SSA were observed in particles with diameters <0.25 μm. Organosulfates, which accounted for approximately 1% of SSA OC mass in PM_1.0, were enhanced in aged SSA and indicated the formation of low-volatility secondary organic aerosol products associated with aging biological molecules such as unsaturated fatty acids, isoprene, and monoterpenes. For example, isoprene-derived organosulfates (e.g., 2-methyltetrol sulfate, C₅H₁₁SO₇ ^-; <i>m</i>/<i>z</i> 215.0225) increased by a factor of 40 in samples of aged SSA and marine volatile organic compounds. Among the strongest organosulfate signals in nascent and aged SSA were alkyl organosulfates, which are known to be anthropogenic surfactants in coastal waters. Homologous series of saturated and unsaturated fatty acids, fatty acid derivatives, and alkyl amines were also identified in nascent and aged SSA, with some species enhanced by aging (i.e., diethylamine) and others not. Together, these bulk and molecular analyses provide insight into molecular modifications that occur upon the chemical aging of nascent SSA.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"9 6","pages":"1453-1464"},"PeriodicalIF":2.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12183759/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144482513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rate Constants and Product Yields for the C + CH3CHO Reaction at Low Temperatures","authors":"Kevin M. Hickson*,&nbsp;Jean-Christophe Loison and Valentine Wakelam,&nbsp;","doi":"10.1021/acsearthspacechem.5c0011110.1021/acsearthspacechem.5c00111","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.5c00111https://doi.org/10.1021/acsearthspacechem.5c00111","url":null,"abstract":"<p >Reactions involving atomic carbon in its ground electronic state, C(³P), play an important role in astrochemistry due to high C atom abundance levels. Here we performed a kinetic investigation of the reaction between C(³P) and acetaldehyde, CH₃CHO, determining rate constants for this process over the 50–296 K range. Measurements of the formation of atomic hydrogen, H(²S), were also performed to provide insight into product formation. Experiments were conducted using a supersonic flow reactor coupled with pulsed laser photolysis for C atom generation and pulsed laser-induced fluorescence in the vacuum ultraviolet range for the detection of both C(³P) and H(²S) atoms. Quantum chemical calculations of the ground triplet state potential energy surface of C₃H₄O were also performed to provide theoretical support for the measurements. The rate constants were large and temperature independent with an average value of 4.0 × 10^–10 cm³ s^–1. This result is consistent with the theoretical results which predict either very low barriers or none at all on the underlying potential energy surface. Although experimental difficulties prevented the quantitative determination of H atom formation, qualitatively, H atom yields were very low with CH₃CH/C₂H₄ + CO as the major products based on the calculations. The influence of this reaction on interstellar chemistry was tested using a gas-grain model of dense interstellar clouds. These simulations predict that the C(³P) + CH₃CHO reaction decreases gas-phase CH₃CHO abundances by more than an order of magnitude at early and intermediate cloud ages, with a lower influence at typical dense cloud ages.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"9 6","pages":"1679–1690 1679–1690"},"PeriodicalIF":2.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312439","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":"Molecular Characterization of Nascent and Aged Sea Spray Aerosol","authors":"Dilini K. Gamage,&nbsp;Elias Hasenecz,&nbsp;Glorianne P. Dorcé,&nbsp;Kathryn J. Mayer,&nbsp;Jon S. Sauer,&nbsp;Christopher Lee,&nbsp;Kimberly A. Prather and Elizabeth A. Stone*,&nbsp;","doi":"10.1021/acsearthspacechem.4c0041210.1021/acsearthspacechem.4c00412","DOIUrl":"https://doi.org/10.1021/acsearthspacechem.4c00412https://doi.org/10.1021/acsearthspacechem.4c00412","url":null,"abstract":"<p >The chemical aging of sea spray aerosol (SSA) was examined in the Sea Spray Chemistry and Particle Evolution (SeaSCAPE) experiment in which nascent SSA particles were generated from seawater by breaking waves in a glass wave channel. Particles and gases in the air in the wave channel headspace were aged in an oxidative flow reactor. Nascent SSA (before reaction) and aged SSA (after reaction) particles were chemically analyzed for inorganic ions, organic carbon (OC), and select organic species, including organosulfates, fatty acids, and alkyl amines. Nascent SSA mass primarily consisted of inorganic ions associated with sea salt. On average, OC accounted for 52% of particle mass &lt;0.25 μm and 0.2% of mass in both supermicron and submicron particles, with an increase in OC relative to Na⁺ with decreasing particle size. The aging process increased the sulfate, phosphate, nitrate, ammonium, and OC concentrations relative to sodium. The largest increases in the sulfate and OC to Na⁺ ratios (by factors of 7 and 5) in aged SSA were observed in particles with diameters &lt;0.25 μm. Organosulfates, which accounted for approximately 1% of SSA OC mass in PM_1.0, were enhanced in aged SSA and indicated the formation of low-volatility secondary organic aerosol products associated with aging biological molecules such as unsaturated fatty acids, isoprene, and monoterpenes. For example, isoprene-derived organosulfates (e.g., 2-methyltetrol sulfate, C₅H₁₁SO₇^–; <i>m</i>/<i>z</i> 215.0225) increased by a factor of 40 in samples of aged SSA and marine volatile organic compounds. Among the strongest organosulfate signals in nascent and aged SSA were alkyl organosulfates, which are known to be anthropogenic surfactants in coastal waters. Homologous series of saturated and unsaturated fatty acids, fatty acid derivatives, and alkyl amines were also identified in nascent and aged SSA, with some species enhanced by aging (i.e., diethylamine) and others not. Together, these bulk and molecular analyses provide insight into molecular modifications that occur upon the chemical aging of nascent SSA.</p>","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"9 6","pages":"1453–1464 1453–1464"},"PeriodicalIF":2.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsearthspacechem.4c00412","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"Carolyn Liu-Kang,&nbsp;Laura-Hélèna Rivellini,&nbsp;Xinke Wang and Jonathan P. D. Abbatt*,&nbsp;","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":15,"journal":{"name":"ACS Earth and Space Chemistry","volume":"9 5","pages":"XXX-XXX XXX-XXX"},"PeriodicalIF":2.9,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acsearthspacechem.5c00003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144443525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}