Characterization of offline analysis of particulate matter with FIGAERO-CIMS

Atmospheric measurement techniques, Journal Year: 2023, Volume and Issue: 16(5), P. 1147 - 1165

Published: March 7, 2023

Abstract. Measurements of the molecular composition organic aerosol (OA) constituents improve our understanding sources, formation processes, and physicochemical properties OA. One instrument providing such data at a time resolution minutes to hours is chemical ionization time-of-flight mass spectrometer with filter inlet for gases aerosols (FIGAERO-CIMS). The technique collects particles on filter, which are subsequently desorbed, evaporated molecules ionized analyzed in spectrometer. However, long-term measurements using this and/or field deployments several sites simultaneously require substantial human financial resources. analysis samples collected outside (offline) may provide more cost-efficient alternative makes technology available large number particle routinely many different globally. Filter-based offline use FIGAERO-CIMS limits method, albeit particle-phase analyses, likely reduced compared online deployments. Here we present application assessment FIGAERO-CIMS, Teflon quartz fiber that were autumn 2018 urban Beijing. We demonstrate feasibility “sandwich” sample preparation over 900 identified compounds (1) high signal-to-noise ratios, (2) repeatability, (3) linear signal response loadings. Comparable overall signals observed between filters 12 24 h but larger semi-volatile filters, due adsorption artifacts. also compare desorption profile (thermogram) shapes two materials. Thermograms used derive volatility qualitatively based temperature maximum intensity compound (Tmax⁡). While find Tmax⁡ can be determined repeatability (±5.7 ∘C) from duplicate tests one type, observe considerable differences warranting further investigation into thermal characteristics types. Overall, study provides basis expanding OA characterization by situations where when deployment itself not possible.

Language: Английский

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Measurement report: Molecular-level investigation of atmospheric cluster ions at the tropical high-altitude research station Chacaltaya (5240 m a.s.l.) in the Bolivian Andes

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(7), P. 4559 - 4576

Published: April 14, 2023

Abstract. Air ions are the key components for a series of atmospheric physicochemical interactions, such as ion-catalyzed reactions, ion-molecule and ion-induced new particle formation (NPF). They also control electrical properties with effects on global climate. We performed molecular-level measurements cluster at high-altitude research station Chacaltaya (CHC; 5240 m a.s.l.), located in Bolivian Andes, from January to May 2018 using an atmospheric-pressure-interface time-of-flight mass spectrometer. The negative mainly consisted (H2SO4)0–3⚫HSO4-, (HNO3)0–2⚫NO3-, SO5-, (NH3)1–6⚫(H2SO4)3–7⚫HSO4-, malonic-acid-derived, CHO / CHON⚫(HSO4- NO3-) ions. Their temporal variability exhibited distinct diurnal seasonal patterns due changes corresponding neutral species' molecular (such electron affinity proton affinity) concentrations resulting air masses arriving CHC different source regions. positive were composed protonated amines organic but no clear variation. H2SO4–NH3 likely contributed NPF process, particularly during wet-to-dry transition period dry season, when was more impacted by originating regions elevated SO2 emissions. Our study provides insights into chemical composition their role mountain environment Andes.

Language: Английский

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Development of a high-resolution emissions inventory of carbonaceous particulate matters and their growth during 2011–2018 over India

Atmospheric Environment, Journal Year: 2023, Volume and Issue: 303, P. 119750 - 119750

Published: March 31, 2023

Language: Английский

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Recent Advancement in Organic Aerosol Understanding: a Review of Their Sources, Formation, and Health Impacts

Water Air & Soil Pollution, Journal Year: 2023, Volume and Issue: 234(12)

Published: Nov. 27, 2023

Language: Английский

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Elucidating the mechanisms of atmospheric new particle formation in the highly polluted Po Valley, Italy

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(4), P. 2423 - 2441

Published: Feb. 26, 2024

Abstract. New particle formation (NPF) is a major source of aerosol particles and cloud condensation nuclei in the troposphere, playing an important role both air quality climate. Frequent NPF events have been observed heavily polluted urban environments, contributing to number concentration by significant amount. The Po Valley region northern Italy has characterized as hotspot for high loadings frequent southern Europe. However, mechanisms growth this are not completely understood. In study, we conducted continuous 2-month measurement campaign with state-of-the-art instruments elucidate Italy. Our results demonstrate that (66 % all days during campaign) primarily driven abundant sulfuric acid (8.5×106 cm−3) basic molecules area. contrast, oxygenated organic from atmospheric oxidation volatile compounds (VOCs) appear play minor initial cluster but contribute significantly consecutive process. Regarding alkaline molecules, amines insufficient stabilize clusters Valley. Ion measurements kinetic models suggest ammonia (10 ppb) must therefore also nucleation Generally, rates sub-2 nm (87 cm−3 s−1) nucleation-mode (5.1 h−1) well relatively low condensational sink (8.9×10-3 will result survival probability newly formed particles, making crucial springtime budget. indicate reducing key pollutants, such SO2, amine NH3, could help substantially decrease concentrations region.

Language: Английский

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Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region

Frontiers of Environmental Science & Engineering, Journal Year: 2023, Volume and Issue: 17(9)

Published: April 15, 2023

Language: Английский

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Weakened Gas-to-Particle Partitioning of Oxygenated Organic Molecules in Liquified Aerosol Particles

Environmental Science & Technology Letters, Journal Year: 2022, Volume and Issue: 9(10), P. 837 - 843

Published: Sept. 21, 2022

Aqueous-phase chemistry plays an important role in secondary organic aerosol (SOA) formation. However, the mechanism of interaction between physics and is still poorly understood. Here continuous measurements gas- particle-phase composition organics were conducted using iodine-adduct time-of-flight chemical ionization mass spectrometer coupled with a filter inlet for gases aerosols Beijing to understand physicochemical processes related SOA Our results showed that contributed 65.9% OA 17.1% nonrefractory PM2.5 during whole campaign. These values are lower than those reported previous studies. oligomerization from methylglyoxal (C3H4O2) oligomers (C4–7H6–10O5) probable path direct gas-to-particle partitioning some CxHyOz particle-gas partition coefficient ≳1.0 × 10–5 weakened when water content (AWC) exceeds 15 μg m–3, corresponding relative glass transition temperature below 0.85 compared AWC <15 m–3. A phase solid/semisolid liquid, increasing diffusivity particles, should explain observed inhibition and, subsequently, low fraction at high humidity pollution events. This study provides new insights into formation mechanism.

Language: Английский

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Nighttime NO emissions strongly suppress chlorine and nitrate radical formation during the winter in Delhi

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(16), P. 9023 - 9036

Published: Aug. 17, 2023

Abstract. Atmospheric pollution in urban regions is highly influenced by oxidants due to their important role the formation of secondary organic aerosol (SOA) and smog. These include nitrate radical (NO3), which typically considered a nighttime oxidant, chlorine (Cl), an extremely potent oxidant that can be released morning chloride-rich environments as result nocturnal build-up nitryl chloride (ClNO2). Chloride makes up higher percentage particulate matter Delhi than has been observed anywhere else world, results Cl having unusually strong influence this city. Here, we present observations model revealing atmospheric chemistry exhibits unusual diel cycle controlled high concentrations NO during night. As this, both NO3 dinitrogen pentoxide (N2O5), precursor ClNO2 thus Cl, are suppressed at night increase levels day. Our indicate substantial reduction potential oxidation via production

Language: Английский

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Characterization of offline analysis of particulate matter with FIGAERO-CIMS

Published: Sept. 12, 2022

Abstract. Measurements of the molecular composition organic aerosol (OA) constituents improve our understanding sources, formation processes, and physicochemical properties OA. One instrument providing such data at a time resolution minutes to hours is Chemical Ionization time-of-flight Mass Spectrometer with Filter Inlet for Gases AEROsols (FIGAERO-CIMS). The technique collects particles on filter, which are subsequently desorbed, evaporated molecules ionized analyzed in mass spectrometer. However, long-term measurements using this and/or field deployments several sites simultaneously, require substantial human financial resources. analysis filter samples collected outside (offline) may provide more cost-efficient alternative makes technology available large number particle routinely many different globally. Filter-based offline use FIGAERO-CIMS limits method albeit particle-phase analyses, likely reduced compared online deployments. Here we present application assessment FIGAERO-CIMS, Teflon Quartz fiber that were autumn 2018 urban Beijing. We demonstrate feasibility “sandwich” sample preparation identified over 900 compounds (1) high signal-to-noise ratios, (2) repeatability, (3) linear signal response loadings. Comparable overall signals observed between filters 12-h 24-h samples, but larger semi-volatile filters, due adsorption artifacts. also compare desorption profile (thermogram) shapes two materials. Thermograms used derive volatility qualitatively based temperature maximum intensity compound (Tmax). While find Tmax can be determined repeatability one type, observe considerable differences warranting further investigation into thermal characteristics types. Overall, study provides basis expanding OA characterization by situations where when deployment itself not possible.

Language: Английский

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Molecular Characterization of Gaseous Organic Acids and Nitrogen‐Containing Compounds From Crop Straw and Wood Burning

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(9)

Published: April 30, 2024

Abstract Biomass burning serves as important sources of volatile organic compounds (VOCs), yet our understanding the molecular characteristics oxygenated (OVOCs) from fresh emissions remains limited. In this study, gaseous in smokes typical Chinese crop straws and woods are measured using an iodide time‐of‐flight chemical ionization mass spectrometer. Approximately 750 formulas identified, with CHO containing carbon, hydrogen oxygen atoms accounting for 77%–95% total. C 1 –C 3 acids dicarboxylic dominate total signal intensities by 27%–48%, while well‐known markers biomass burning, such monosaccharide, guaiacol syringol derivatives, contribute 7%–17%. Notably, straw wood emit a higher abundance than derivatives factor 5. Additionally, variety nitrogen‐containing (mainly CHON group) is including isocyanate, amide, amino acids, pyridine. The spectral profiles largely similar between fuels, although produces contributions carbon numbers >10. saturation concentrations estimated formula‐based volatility parameterization, revealing that semi‐volatile intermediate VOCs (S/intermediate (IVOCs)) predominate smoke releases 35%–60% 20%–43%, respectively, only small fraction low‐volatility compounds. Given widespread nature winter China, results may have significant implications interpreting secondary aerosol formation through gas‐particle partitioning or aqueous‐phase reactions.

Language: Английский

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