1
|
Frederiks NC, Johnson CJ. Photochemical Mechanisms in Atmospherically Relevant Iodine Oxide Clusters. J Phys Chem Lett 2024; 15:6306-6314. [PMID: 38856106 DOI: 10.1021/acs.jpclett.4c01324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
Atmospheric new particle formation events can be driven by iodine oxides or oxoacids via both neutral and ionic mechanisms. Photolysis of new particles likely plays a significant role in their growth mechanisms, but their spectra and photolysis mechanisms remain difficult to characterize. We recorded ultraviolet (UV) photodissociation spectra of (I2O5)0-3(IO3-) clusters, observing loss of an O atom, I2O4, and (I2O5)1,2 in the atmospherically relevant range of 300-340 nm. With increasing cluster size, the intensity of absorption red shifts and generally increases, suggesting particles photolyze more frequently as they grow. Estimates of the rates indicate that even relatively small clusters are likely to undergo photolysis under high-UV conditions. Vibrational spectra identify the covalent moiety I3O8- as the likely chromophore, not IO3-. The I2O5 loss pathway competes with particle growth, while the slower O loss pathway likely produces 3O + 3(cluster) products that could drive subsequent intraparticle chemistry, particularly with co-adsorbed organic or amine species.
Collapse
Affiliation(s)
- Nicoline C Frederiks
- Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, New York 11794, United States
| | - Christopher J Johnson
- Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, New York 11794, United States
| |
Collapse
|
2
|
Rörup B, He XC, Shen J, Baalbaki R, Dada L, Sipilä M, Kirkby J, Kulmala M, Amorim A, Baccarini A, Bell DM, Caudillo-Plath L, Duplissy J, Finkenzeller H, Kürten A, Lamkaddam H, Lee CP, Makhmutov V, Manninen HE, Marie G, Marten R, Mentler B, Onnela A, Philippov M, Scholz CW, Simon M, Stolzenburg D, Tham YJ, Tomé A, Wagner AC, Wang M, Wang D, Wang Y, Weber SK, Zauner-Wieczorek M, Baltensperger U, Curtius J, Donahue NM, El Haddad I, Flagan RC, Hansel A, Möhler O, Petäjä T, Volkamer R, Worsnop D, Lehtipalo K. Temperature, humidity, and ionisation effect of iodine oxoacid nucleation. ENVIRONMENTAL SCIENCE: ATMOSPHERES 2024; 4:531-546. [PMID: 38764888 PMCID: PMC11097302 DOI: 10.1039/d4ea00013g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Accepted: 03/21/2024] [Indexed: 05/21/2024]
Abstract
Iodine oxoacids are recognised for their significant contribution to the formation of new particles in marine and polar atmospheres. Nevertheless, to incorporate the iodine oxoacid nucleation mechanism into global simulations, it is essential to comprehend how this mechanism varies under various atmospheric conditions. In this study, we combined measurements from the CLOUD (Cosmic Leaving OUtdoor Droplets) chamber at CERN and simulations with a kinetic model to investigate the impact of temperature, ionisation, and humidity on iodine oxoacid nucleation. Our findings reveal that ion-induced particle formation rates remain largely unaffected by changes in temperature. However, neutral particle formation rates experience a significant increase when the temperature drops from +10 °C to -10 °C. Running the kinetic model with varying ionisation rates demonstrates that the particle formation rate only increases with a higher ionisation rate when the iodic acid concentration exceeds 1.5 × 107 cm-3, a concentration rarely reached in pristine marine atmospheres. Consequently, our simulations suggest that, despite higher ionisation rates, the charged cluster nucleation pathway of iodic acid is unlikely to be enhanced in the upper troposphere by higher ionisation rates. Instead, the neutral nucleation channel is likely to be the dominant channel in that region. Notably, the iodine oxoacid nucleation mechanism remains unaffected by changes in relative humidity from 2% to 80%. However, under unrealistically dry conditions (below 0.008% RH at +10 °C), iodine oxides (I2O4 and I2O5) significantly enhance formation rates. Therefore, we conclude that iodine oxoacid nucleation is the dominant nucleation mechanism for iodine nucleation in the marine and polar boundary layer atmosphere.
Collapse
Affiliation(s)
- Birte Rörup
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
| | - Xu-Cheng He
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
- Yusuf Hamied Department of Chemistry, University of Cambridge Cambridge UK
| | - Jiali Shen
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
- Helsinki Institute of Physics, University of Helsinki Helsinki Finland
| | - Rima Baalbaki
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
| | - Lubna Dada
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute Villigen Switzerland
| | - Mikko Sipilä
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
| | - Jasper Kirkby
- CERN, European Organisation for Nuclear Research Geneva Switzerland
- Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main Frankfurt am Main Germany
| | - Markku Kulmala
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
- Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University Nanjing China
| | | | - Andrea Baccarini
- Laboratory of Atmospheric Processes and their Impacts, École polytechnique fédérale de Lausanne Lausanne Switzerland
| | - David M Bell
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute Villigen Switzerland
| | - Lucía Caudillo-Plath
- Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main Frankfurt am Main Germany
| | - Jonathan Duplissy
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
- Helsinki Institute of Physics, University of Helsinki Helsinki Finland
| | - Henning Finkenzeller
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
- Department of Chemistry & CIRES, University of Colorado Boulder Boulder USA
| | - Andreas Kürten
- Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main Frankfurt am Main Germany
| | - Houssni Lamkaddam
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute Villigen Switzerland
| | - Chuan Ping Lee
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute Villigen Switzerland
| | - Vladimir Makhmutov
- Lebedev Physical Institute, Russian Academy of Sciences Moscow Russia
- Moscow Institute of Physics and Technology, National Research University Moscow Russia
| | - Hanna E Manninen
- CERN, European Organisation for Nuclear Research Geneva Switzerland
| | - Guillaume Marie
- Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main Frankfurt am Main Germany
| | - Ruby Marten
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute Villigen Switzerland
| | - Bernhard Mentler
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
- Yusuf Hamied Department of Chemistry, University of Cambridge Cambridge UK
| | - Antti Onnela
- CERN, European Organisation for Nuclear Research Geneva Switzerland
| | - Maxim Philippov
- Lebedev Physical Institute, Russian Academy of Sciences Moscow Russia
| | | | - Mario Simon
- Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main Frankfurt am Main Germany
| | - Dominik Stolzenburg
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
- Institute for Materials Chemistry, TU Wien Vienna Austria
- Faculty of Physics, University of Vienna Vienna Austria
| | - Yee Jun Tham
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
- School of Marine Sciences, Sun Yat-sen University Zhuhai China
| | - António Tomé
- IDL-UBI, Universidade da Beira Interior Covilhã Portugal
| | - Andrea C Wagner
- Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main Frankfurt am Main Germany
- Aerosol Physics, Tampere University Tampere Finland
| | - Mingyi Wang
- Department of the Geophysical Sciences, University of Chicago Chicago USA
| | - Dongyu Wang
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute Villigen Switzerland
| | - Yonghong Wang
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences Beijing China
| | - Stefan K Weber
- CERN, European Organisation for Nuclear Research Geneva Switzerland
- Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main Frankfurt am Main Germany
| | - Marcel Zauner-Wieczorek
- Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main Frankfurt am Main Germany
| | - Urs Baltensperger
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute Villigen Switzerland
| | - Joachim Curtius
- Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main Frankfurt am Main Germany
| | - Neil M Donahue
- Center for Atmospheric Particle Studies, Carnegie Mellon University Pittsburgh USA
| | - Imad El Haddad
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute Villigen Switzerland
| | - Richard C Flagan
- Division of Chemistry and Chemical Engineering, California Institute of Technology Pasadena USA
| | - Armin Hansel
- Institute for Ion and Applied Physics, University of Innsbruck Innsbruck Austria
| | - Ottmar Möhler
- Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology Karlsruhe Germany
| | - Tuukka Petäjä
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
| | - Rainer Volkamer
- Department of Chemistry & CIRES, University of Colorado Boulder Boulder USA
| | - Douglas Worsnop
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
| | - Katrianne Lehtipalo
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki Helsinki Finland
- Finnish Meteorological Institute Helsinki Finland
| |
Collapse
|
3
|
Chen T, Liu J, Chu B, Ge Y, Zhang P, Ma Q, He H. Combined Smog Chamber/Oxidation Flow Reactor Study on Aging of Secondary Organic Aerosol from Photooxidation of Aromatic Hydrocarbons. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:13937-13947. [PMID: 37691473 DOI: 10.1021/acs.est.3c04089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
Secondary organic aerosol (SOA) is a significant component of atmospheric fine particulate matter (PM2.5), and their physicochemical properties can be significantly changed in the aging process. In this study, we used a combination consisting of a smog chamber (SC) and oxidation flow reactor (OFR) to investigate the continuous aging process of gas-phase organic intermediates and SOA formed from the photooxidation of toluene, a typical aromatic hydrocarbon. Our results showed that as the OH exposure increased from 2.6 × 1011 to 6.3 × 1011 molecules cm-3 s (equivalent aging time of 2.01-4.85 days), the SOA mass concentration (2.9 ± 0.05-28.7 ± 0.6 μg cm-3) and corrected SOA yield (0.073-0.26) were significantly enhanced. As the aging process proceeds, organic acids and multiple oxygen-containing oxidation products are continuously produced from the photochemical aging process of gas-phase organic intermediates (mainly semi-volatile and intermediate volatility species, S/IVOCs). The multigeneration oxidation products then partition to the aerosol phase, while functionalization of SOA rather than fragmentation dominated in the photochemical aging process, resulting in much higher SOA yield after aging compared to that in the SC. Our study indicates that SOA yields as a function of OH exposure should be considered in air quality models to improve SOA simulation, and thus accurately assess the impact on SOA properties and regional air quality.
Collapse
Affiliation(s)
- Tianzeng Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jun Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Biwu Chu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanli Ge
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Beijing Innovation Center for Engineering Science and Advanced Technology, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Peng Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qingxin Ma
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| |
Collapse
|
4
|
Bouallagui A, Zanchet A, Bañares L, García-Vela A. An ab initio study of the photodissociation of CH 2I and CH 2I . Phys Chem Chem Phys 2023. [PMID: 37465906 DOI: 10.1039/d3cp01460f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
Photodissociation of the CH2I radical and the CH2I+ cation is studied by means of high-level ab initio calculations, including spin-orbit effects. Potential-energy curves (PEC) along the dissociating bond distances involved in some fragmentation pathways of these species are computed for the ground and several excited electronic states. Based on the PECs obtained, the possible photodissociation mechanisms are analyzed and suggested. Significant differences are found between the fragmentation dynamics of the neutral radical and that of the cation. While a relatively simple dissociation dynamics is predicted for CH2I, more complex fragmentation mechanisms involving internal conversion and couplings between different excited electronic states are expected for CH2I+. The species studied here are relevant to atmospheric chemistry, and the present work can help to understand better how their photodissociation may affect chemical processes in the atmosphere.
Collapse
Affiliation(s)
- A Bouallagui
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA LR01ES09, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092, Tunis, Tunisia
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 123, 28006 Madrid, Spain.
| | - A Zanchet
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 123, 28006 Madrid, Spain.
| | - L Bañares
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad Complutense de Madrid (Unidad Asociada I+D+i CSIC), 28040 Madrid, Spain
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanoscience), 28049 Madrid, Spain
| | - A García-Vela
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, Serrano 123, 28006 Madrid, Spain.
| |
Collapse
|
5
|
Ning A, Zhong J, Li L, Li H, Liu J, Liu L, Liang Y, Li J, Zhang X, Francisco JS, He H. Chemical Implications of Rapid Reactive Absorption of I 2O 4 at the Air-Water Interface. J Am Chem Soc 2023; 145:10817-10825. [PMID: 37133920 DOI: 10.1021/jacs.3c01862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Marine aerosol formation involving iodine-bearing species significantly affects the global climate and radiation balance. Although recent studies outline the critical role of iodine oxide in nucleation, much less is known about its contribution to aerosol growth. This paper presents molecular-level evidence that the air-water interfacial reaction of I2O4 mediated by potent atmospheric chemicals, such as sulfuric acid (H2SO4) and amines [e.g., dimethylamine (DMA) and trimethylamine (TMA)], can occur rapidly on a picosecond time scale by Born-Oppenheimer molecular dynamics simulations. The interfacial water bridges the reactants while facilitating the DMA-mediated proton transfer and stabilizing the ionic products of H2SO4-involved reactions. The identified heterogeneous mechanisms exhibit the dual contribution to aerosol growth: (i) the ionic products (e.g., IO3-, DMAH+, TMAH+, and HSO4-) formed by reactive adsorption possess less volatility than the reactants and (ii) these ions, such as alkylammonium salts (e.g., DMAH+), are also highly hydrophilic, further facilitating hygroscopic growth. This investigation enhances not only our understanding of heterogeneous iodine chemistry but also the impact of iodine oxide on aerosol growth. Also, these findings can bridge the gap between the abundance of I2O4 in the laboratory and its absence in field-collected aerosols and provide an explanation for the missing source of IO3-, HSO4-, and DMAH+ in marine aerosols.
Collapse
Affiliation(s)
- An Ning
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Jie Zhong
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China
| | - Liwen Li
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China
| | - Hao Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jiarong Liu
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Ling Liu
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Yan Liang
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Jing Li
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Xiuhui Zhang
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Joseph S Francisco
- Department of Earth and Environmental Science and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6316, United States
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| |
Collapse
|
6
|
Chen T, Zhang P, Chu B, Ma Q, Ge Y, He H. Synergistic Effects of SO 2 and NH 3 Coexistence on SOA Formation from Gasoline Evaporative Emissions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:6616-6625. [PMID: 37055378 DOI: 10.1021/acs.est.3c01921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Vehicular evaporative emissions make an increasing contribution to anthropogenic sources of volatile organic compounds (VOCs), thus contributing to secondary organic aerosol (SOA) formation. However, few studies have been conducted on SOA formation from vehicle evaporative VOCs under complex pollution conditions with the coexistence of NOx, SO2, and NH3. In this study, the synergistic effects of SO2 and NH3 on SOA formation from gasoline evaporative VOCs with NOx were examined using a 30 m3 smog chamber with the aid of a series of mass spectrometers. Compared with the systems involving SO2 or NH3 alone, SO2 and NH3 coexistence had a greater promotion effect on SOA formation, which was larger than the cumulative effect of the two promotions alone. Meanwhile, contrasting effects of SO2 on the oxidation state (OSc) of SOA in the presence or absence of NH3 were observed, and SO2 could further increase the OSc with the coexistence of NH3. The latter was attributed to the synergistic effects of SO2 and NH3 coexistence on SOA formation, wherein N-S-O adducts can be formed from the reaction of SO2 with N-heterocycles generated in the presence of NH3. Our study contributes to the understanding of SOA formation from vehicle evaporative VOCs under highly complex pollution conditions and its atmospheric implications.
Collapse
Affiliation(s)
- Tianzeng Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Peng Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Biwu Chu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qingxin Ma
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanli Ge
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Beijing Innovation Center for Engineering Science and Advanced Technology, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| |
Collapse
|
7
|
Frederiks NC, Heaney DD, Kreinbihl JJ, Johnson CJ. The Competition between Hydrogen, Halogen, and Covalent Bonding in Atmospherically Relevant Ammonium Iodate Clusters. J Am Chem Soc 2023; 145:1165-1175. [PMID: 36595580 DOI: 10.1021/jacs.2c10841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Iodine-containing clusters are expected to be central to new particle formation (NPF) events in polar and midlatitude coastal regions. Iodine oxoacids and iodine oxides are observed in newly formed clusters, and in more polluted midlatitude settings, theoretical studies suggest ammonia may increase growth rates. Structural information was obtained via infrared (IR) spectroscopy and quantum chemical calculations for a series of clusters containing ammonia, iodic acid, and iodine pentoxide. Structures for five of the smallest cationic clusters present in the mass spectrum were identified, and four of the structures were found to preferentially form halogen and/or covalent bonds over hydrogen bonds. Ammonia is important in proton transfer from iodic acid components and also provides a scaffold to template the formation of a halogen and covalent bonded backbone. The calculations executed for the two largest clusters studied suggested the formation of a covalent I3O8- anion within the clusters.
Collapse
Affiliation(s)
- Nicoline C Frederiks
- Department of Chemistry, Stony Brook University, 100 Nicolls Rd., Stony Brook, New York11794, United States
| | - Danika D Heaney
- Department of Chemistry, Stony Brook University, 100 Nicolls Rd., Stony Brook, New York11794, United States
| | - John J Kreinbihl
- Department of Chemistry, Stony Brook University, 100 Nicolls Rd., Stony Brook, New York11794, United States
| | - Christopher J Johnson
- Department of Chemistry, Stony Brook University, 100 Nicolls Rd., Stony Brook, New York11794, United States
| |
Collapse
|
8
|
Zhang R, Xie HB, Ma F, Chen J, Iyer S, Simon M, Heinritzi M, Shen J, Tham YJ, Kurtén T, Worsnop DR, Kirkby J, Curtius J, Sipilä M, Kulmala M, He XC. Critical Role of Iodous Acid in Neutral Iodine Oxoacid Nucleation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:14166-14177. [PMID: 36126141 PMCID: PMC9536010 DOI: 10.1021/acs.est.2c04328] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Nucleation of neutral iodine particles has recently been found to involve both iodic acid (HIO3) and iodous acid (HIO2). However, the precise role of HIO2 in iodine oxoacid nucleation remains unclear. Herein, we probe such a role by investigating the cluster formation mechanisms and kinetics of (HIO3)m(HIO2)n (m = 0-4, n = 0-4) clusters with quantum chemical calculations and atmospheric cluster dynamics modeling. When compared with HIO3, we find that HIO2 binds more strongly with HIO3 and also more strongly with HIO2. After accounting for ambient vapor concentrations, the fastest nucleation rate is predicted for mixed HIO3-HIO2 clusters rather than for pure HIO3 or HIO2 ones. Our calculations reveal that the strong binding results from HIO2 exhibiting a base behavior (accepting a proton from HIO3) and forming stronger halogen bonds. Moreover, the binding energies of (HIO3)m(HIO2)n clusters show a far more tolerant choice of growth paths when compared with the strict stoichiometry required for sulfuric acid-base nucleation. Our predicted cluster formation rates and dimer concentrations are acceptably consistent with those measured by the Cosmic Leaving Outdoor Droplets (CLOUD) experiment. This study suggests that HIO2 could facilitate the nucleation of other acids beyond HIO3 in regions where base vapors such as ammonia or amines are scarce.
Collapse
Affiliation(s)
- Rongjie Zhang
- Key
Laboratory of Industrial Ecology and Environmental Engineering (Ministry
of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Hong-Bin Xie
- Key
Laboratory of Industrial Ecology and Environmental Engineering (Ministry
of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
- . Phone: +86-411-84707251
| | - Fangfang Ma
- Key
Laboratory of Industrial Ecology and Environmental Engineering (Ministry
of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Jingwen Chen
- Key
Laboratory of Industrial Ecology and Environmental Engineering (Ministry
of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Siddharth Iyer
- Aerosol
Physics Laboratory, Faculty of Engineering and Natural Sciences, Tampere University, Tampere 33014, Finland
| | - Mario Simon
- Institute
for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt am Main 60438, Germany
| | - Martin Heinritzi
- Institute
for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt am Main 60438, Germany
| | - Jiali Shen
- Institute
for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki 00014, Finland
| | - Yee Jun Tham
- School
of Marine Sciences, Sun Yat-sen University, Zhuhai 519082, China
| | - Theo Kurtén
- Department
of Chemistry, University of Helsinki, Helsinki 00014, Finland
| | - Douglas R. Worsnop
- Institute
for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki 00014, Finland
- Aerodyne
Research, Inc., Billerica, Massachusetts 01821, United States
| | - Jasper Kirkby
- Institute
for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt am Main 60438, Germany
- CERN,
the European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland
| | - Joachim Curtius
- Institute
for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Frankfurt am Main 60438, Germany
| | - Mikko Sipilä
- Institute
for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki 00014, Finland
| | - Markku Kulmala
- Institute
for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki 00014, Finland
- Joint
International Research Laboratory of Atmospheric and Earth System
Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China
- Aerosol
and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter
Science and Engineering, Beijing University
of Chemical Technology, Beijing 100029, China
| | - Xu-Cheng He
- Institute
for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki 00014, Finland
- Center
for Atmospheric Particle Studies, Carnegie
Mellon University, Pittsburgh, Pennsylvania 15213, United States
| |
Collapse
|
9
|
R'Mili B, Strekowski RS, Temime-Roussel B, Wortham H, Monod A. Important effects of relative humidity on the formation processes of iodine oxide particles from CH 3I photo-oxidation. JOURNAL OF HAZARDOUS MATERIALS 2022; 433:128729. [PMID: 35405585 DOI: 10.1016/j.jhazmat.2022.128729] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 02/21/2022] [Accepted: 03/15/2022] [Indexed: 06/14/2023]
Abstract
In this work, laboratory chamber experiments of gas-phase methyl iodide photolysis in the presence of ozone at three relative humidity conditions were performed to study the formation and physico-chemical properties of iodine oxide particles. The obtained results revealed significant morphological changes of iodine oxide particles that were observed to depend on relative humidity. The formed iodine oxide particles under dry conditions were supposed to be agglomerates of fine hygroscopic crystals. On the other hand, a humid atmosphere was observed to favor the formation of isomeric, tetragonal and orthorhombic hygroscopic crystals potentially composed of HIO3 likely formed from progressive hydration of iodine oxide clusters. This process leads to a release of molecular iodine, I2, which may indicate a potential role of I2O4 in the particles' evolution processes. The obtained results on the iodine oxides' behavior are important to the nuclear power plant safety industry since many of the organic iodides that may be released during a major nuclear power-plant accident contain radioactive isotopes of iodine that are known to have lethal or toxic impacts on human health.
Collapse
Affiliation(s)
- Badr R'Mili
- Aix-Marseille Univ, CNRS, LCE, Marseille, France
| | | | | | | | - Anne Monod
- Aix-Marseille Univ, CNRS, LCE, Marseille, France.
| |
Collapse
|
10
|
Zhang S, Li S, Ning A, Liu L, Zhang X. Iodous acid - a more efficient nucleation precursor than iodic acid. Phys Chem Chem Phys 2022; 24:13651-13660. [PMID: 35611676 DOI: 10.1039/d2cp00302c] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iodous acid (HIO2), a vital iodine oxyacid, potentially plays an important role in the formation of new particles in marine areas (He et al., Science, 2021, 371, 589-595). However, the nucleation mechanism of HIO2 is still poorly understood. Herein, the self-nucleation of HIO2 under different atmospheric conditions is investigated by a combination of quantum chemical calculations and the Atmospheric Cluster Dynamics Code (ACDC) simulations. The results indicate that HIO2 can form relatively stable molecular clusters through hydrogen bonds and halogen bonds, and the self-nucleation of HIO2 proceeds by sequential addition of HIO2 or HIO2-based small clusters. Besides, in order to better illustrate the role of HIO2 in new particle formation (NPF) in marine areas, we compare its nucleation properties with those of iodic acid (HIO3), a significant iodine-containing nucleation precursor in marine regions. We find that the cluster formation rate of the self-nucleation of HIO2 is higher than that of the self-nucleation of HIO3 although [HIO2] is lower than [HIO3], which indicates that the HIO2 molecule is a more efficient nucleation precursor than the HIO3 molecule. Therefore, the self-nucleation of HIO2 could become one of the most important sources for NPF in marine areas, which could provide potential theoretical evidence for explaining the intensive NPF events observed in these areas.
Collapse
Affiliation(s)
- Shaobing Zhang
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China.
| | - Shuning Li
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China. .,National Supercomputer Center in Tianjin, Tianjin, 300451, China
| | - An Ning
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China.
| | - Ling Liu
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China.
| | - Xiuhui Zhang
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China.
| |
Collapse
|
11
|
Liang Y, Rong H, Liu L, Zhang S, Zhang X, Xu W. Gas-phase catalytic hydration of I 2O 5 in the polluted coastal regions: Reaction mechanisms and atmospheric implications. J Environ Sci (China) 2022; 114:412-421. [PMID: 35459504 DOI: 10.1016/j.jes.2021.09.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 09/21/2021] [Accepted: 09/24/2021] [Indexed: 06/14/2023]
Abstract
Marine aerosols play an important role in the global aerosol system. In polluted coastal regions, ultra-fine particles have been recognized to be related to iodine-containing species and is more serious due to the impact of atmospheric pollutants. Many previous studies have identified iodine pentoxide (I2O5, IP) to be the key species in new particles formation (NPF) in marine regions, but the role of IP in the polluted coastal atmosphere is far to be fully understood. Considering the high humidity and concentrations of pollutants in the polluted coastal regions, the gas-phase hydration of IP catalyzed by sulfuric acid (SA), nitric acid (NA), dimethylamine (DMA), and ammonia (A) have been investigated at DLPNO-CCSD(T)//ωB97X-D/aug-cc-pVTZ + aug-cc-pVTZ-PP with ECP28MDF (for iodine) level of theory. The results show that the hydration of IP involves a significant energy barrier of 22.33 kcal/mol, while the pollutants SA, NA, DMA, and A all could catalyze the hydration of IP. Especially, with SA and DMA as catalysts, the hydration reactions of IP present extremely low barriers and high rate constants. It is suggested that IP is unstable under the catalysis of SA and DMA to generate iodic acid, which is the key component in NPF in marine regions. Thus, the catalytic hydration of IP is very likely to trigger the formation of iodine-containing particles. Our research provides a clear picture of the catalytic hydration of IP as well as theoretical guidance for NPF in the polluted coastal atmosphere.
Collapse
Affiliation(s)
- Yan Liang
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Hui Rong
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Ling Liu
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Shaobing Zhang
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Xiuhui Zhang
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
| | - Wenguo Xu
- School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
| |
Collapse
|
12
|
Roberts FC, Lehman JH. Infrared frequency comb spectroscopy of CH 2I 2: Influence of hot bands and pressure broadening on the ν 1 and ν 6 fundamental transitions. J Chem Phys 2022; 156:114301. [DOI: 10.1063/5.0081836] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Direct frequency comb spectroscopy was utilized to measure the vibrational absorption spectrum of diiodomethane, CH2I2, from 2960 to 3125 cm−1. The data were obtained using a CH2I2 concentration of (6.8 ± 1.3) × 1015 molecule cm−3 and a total pressure of 10–300 mbar with either nitrogen or argon as the bath gas. The rovibrational spectra of two fundamental transitions, ν6 and ν1, were recorded and analyzed. We suggest that a significant contribution to the observed congested spectra is due to the population in excited vibrational states of the low energy ν4 I–C–I bend, resulting in transitions 6104nn and 1104nn, where the integer n is the initial vibrational level v = 1–5. PGOPHER was used to fit the experimental spectrum, allowing for rotational constants and other spectral information to be reported. In addition, it was found that the peak widths for the observed transitions were limited by pressure broadening, resulting in a pressure broadening parameter of (0.143 ± 0.006) cm−1 atm−1 by N2 and (0.116 ± 0.006) cm−1 atm−1 by Ar. Further implications for other dihaloalkane infrared spectra are discussed.
Collapse
Affiliation(s)
| | - Julia H. Lehman
- School of Chemistry, University of Leeds, Leeds, United Kingdom
| |
Collapse
|
13
|
Xing D, Yuan X, Liang C, Jin T, Zhang S, Zhang X. Spontaneous oxidation of I − in water microdroplets and its atmospheric implications. Chem Commun (Camb) 2022; 58:12447-12450. [DOI: 10.1039/d2cc04288f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water microdroplets can oxidize I− into I˙, presenting a previously unknown source of I˙ and I2 in atmospheric water.
Collapse
Affiliation(s)
- Dong Xing
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071, China
| | - Xu Yuan
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071, China
| | - Chiyu Liang
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071, China
| | - Tianyun Jin
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071, China
| | - Shuquan Zhang
- Integrated Chinese and Western Medicine Hospital, Tianjin University, Tianjin 300100, China
| | - Xinxing Zhang
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071, China
| |
Collapse
|
14
|
Chicharro DV, Hrodmarsson HR, Bouallagui A, Zanchet A, Loison JC, García GA, García-Vela A, Bañares L, Marggi Poullain S. Threshold Photoelectron Spectroscopy of the CH 2I, CHI, and CI Radicals. J Phys Chem A 2021; 125:6122-6130. [PMID: 34232644 PMCID: PMC8478278 DOI: 10.1021/acs.jpca.1c03874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
VUV photoionization of the CHnI radicals (with n = 0, 1, and 2) is investigated by means of synchrotron radiation coupled with a double imaging photoion-photoelectron coincidence spectrometer. Photoionization efficiencies and threshold photoelectron spectra (TPES) for photon energies ranging between 9.2 and 12.0 eV are reported. An adiabatic ionization energy (AIE) of 8.334 ± 0.005 eV is obtained for CH2I, which is in good agreement with previous results [8.333 ± 0.015 eV, Sztáray J. Chem. Phys. 2017, 147, 013944], while for CI an AIE of 8.374 ± 0.005 eV is measured for the first time and a value of ∼8.8 eV is estimated for CHI. Ab initio calculations have been carried out for the ground state of the CH2I radical and for the ground state and excited states of the radical cation CH2I+, including potential energy curves along the C-I coordinate. Franck-Condon factors are calculated for transitions from the CH2I(X̃2B1) ground state of the neutral radical to the ground state and excited states of the radical cation. The TPES measured for the CH2I radical shows several structures that correspond to the photoionization into excited states of the radical cation and are fully assigned on the basis of the calculations. The TPES obtained for the CHI is characterized by a broad structure peaking at 9.335 eV, which could be due to the photoionization from both the singlet and the triplet states and into one or more electronic states of the cation. A vibrational progression is clearly observed in the TPES for the CI radical and a frequency for the C-I stretching mode of 760 ± 60 cm-1 characterizing the CI+ electronic ground state has been extracted.
Collapse
Affiliation(s)
- David V Chicharro
- Departamento de Química Física (Unidad Asociada I+D+i al CSIC), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Helgi Rafn Hrodmarsson
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, BP 48, 91192 Gif sur Yvette, France
| | - Aymen Bouallagui
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, C/Serrano, 123, 28006 Madrid, Spain.,Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA LR01ES09, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Tunis, Tunisia
| | - Alexandre Zanchet
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, C/Serrano, 123, 28006 Madrid, Spain
| | - Jean-Christophe Loison
- ISM, Université Bordeaux 1, CNRS, 351 cours de la Libération, 33405 Talence Cedex, France
| | - Gustavo A García
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, BP 48, 91192 Gif sur Yvette, France
| | - Alberto García-Vela
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas, C/Serrano, 123, 28006 Madrid, Spain
| | - Luis Bañares
- Departamento de Química Física (Unidad Asociada I+D+i al CSIC), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain.,Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanoscience), Cantoblanco, 28049 Madrid, Spain
| | - Sonia Marggi Poullain
- Departamento de Química Física (Unidad Asociada I+D+i al CSIC), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| |
Collapse
|
15
|
A gas-to-particle conversion mechanism helps to explain atmospheric particle formation through clustering of iodine oxides. Nat Commun 2020; 11:4521. [PMID: 32908140 PMCID: PMC7481236 DOI: 10.1038/s41467-020-18252-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Accepted: 08/12/2020] [Indexed: 11/10/2022] Open
Abstract
Emitted from the oceans, iodine-bearing molecules are ubiquitous in the atmosphere and a source of new atmospheric aerosol particles of potentially global significance. However, its inclusion in atmospheric models is hindered by a lack of understanding of the first steps of the photochemical gas-to-particle conversion mechanism. Our laboratory results show that under a high humidity and low HOx regime, the recently proposed nucleating molecule (iodic acid, HOIO2) does not form rapidly enough, and gas-to-particle conversion proceeds by clustering of iodine oxides (IxOy), albeit at slower rates than under dryer conditions. Moreover, we show experimentally that gas-phase HOIO2 is not necessary for the formation of HOIO2-containing particles. These insights help to explain new particle formation in the relatively dry polar regions and, more generally, provide for the first time a thermochemically feasible molecular mechanism from ocean iodine emissions to atmospheric particles that is currently missing in model calculations of aerosol radiative forcing. “How iodine-bearing molecules contribute to atmospheric aerosol formation is not well understood. Here, the authors provide a new gas-to-particle conversion mechanism and show that clustering of iodine oxides is an essential component of this process while previously proposed iodic acid does not play a large role.”
Collapse
|
16
|
Onel L, Blitz M, Seakins P, Heard D, Stone D. Kinetics of the Gas Phase Reactions of the Criegee Intermediate CH 2OO with O 3 and IO. J Phys Chem A 2020; 124:6287-6293. [PMID: 32667796 DOI: 10.1021/acs.jpca.0c04422] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The kinetics of the gas phase reactions of the Criegee intermediate CH2OO with O3 and IO have been studied at 296 K and 300 Torr through simultaneous measurements of CH2OO, the CH2OO precursor (CH2I2), O3, and IO using flash photolysis of CH2I2/O2/O3/N2 mixtures at 248 nm coupled to time-resolved broadband UV absorption spectroscopy. Experiments were performed under pseudo-first-order conditions with respect to O3, with the rate coefficients for reactions of CH2OO with O3 and IO obtained by fitting to the observed decays of CH2OO using a model constrained to the measured concentrations of IO. Fits were performed globally, with the ratio between the initial concentration of O3 and the average concentration of IO varying in the range 30-700, and gave kCH2OO+O3 = (3.6 ± 0.8) × 10-13 cm3 molecule-1 s-1 and kCH2OO+IO = (7.6 ± 1.4) × 10-11 cm3 molecule-1 s-1 (where the errors are at the 2σ level). The magnitude of kCH2OO+O3 has a significant effect on the steady state concentration of CH2OO in chamber studies. Atmospheric implications of the results are discussed.
Collapse
|
17
|
Kumar M, Trabelsi T, Gómez Martín JC, Saiz-Lopez A, Francisco JS. HIO x-IONO 2 Dynamics at the Air-Water Interface: Revealing the Existence of a Halogen Bond at the Atmospheric Aerosol Surface. J Am Chem Soc 2020; 142:12467-12477. [PMID: 32578419 DOI: 10.1021/jacs.0c05232] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Iodine is enriched in marine aerosols, particularly in coastal mid-latitude atmospheric environments, where it initiates the formation of new aerosol particles with iodic acid (HIO3) composition. However, particle formation in polluted and semipolluted locations is inhibited when the iodine monoxide radical (IO) is intercepted by NO2 to form the iodine nitrate (IONO2). The primary fate of IONO2 is believed to be, besides photolysis, uptake by aerosol surfaces, leading to particulate iodine activation. Herein we have performed Born-Oppenheimer molecular dynamics (BOMD) simulations and gas-phase quantum chemical calculations to study the iodine acids-iodine nitrate [HIOx (x = 2 and 3)-IONO2] dynamics at the air-water interface modeled by a water droplet of 191 water molecules. The results indicate that IONO2 does not react directly with these iodine acids, but forms an unusual kind of interaction with them within a few picoseconds, which is characterized as halogen bonding. The halogen bond-driven HIO3-IONO2 complex at the air-water interface undergoes deprotonation and exists as IO3--IONO2 anion, whereas the HIO2-IONO2 complex does not exhibit any proton loss to the interfacial water molecules. The gas-phase quantum chemical calculations suggest that the HIO3-IONO2 and HIO2-IONO2 complexes have appreciable stabilization energies, which are significantly enhanced upon deprotonation of iodine acids, indicating that these halogen bonds are fairly stable. These IONO2-induced halogen bonds explain the rapid loss of IONO2 to background aerosol. Moreover, they appear to work against iodide formation. Thus, they may play an important role in enhancing the amount of atmospherically nonrecyclable iodine (iodate) in marine aerosol.
Collapse
Affiliation(s)
- Manoj Kumar
- Department of Earth and Environmental Science and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, United States
| | - Tarek Trabelsi
- Department of Earth and Environmental Science and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, United States
| | - Juan Carlos Gómez Martín
- Solar System Department, Andalusian Institute for Astrophysics, Consejo Superior de Investigaciones Científicas, Granada 18008, Spain
| | - Alfonso Saiz-Lopez
- Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, Consejo Superior de Investigaciones Científicas, Madrid 28006, Spain
| | - Joseph S Francisco
- Department of Earth and Environmental Science and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, United States
| |
Collapse
|
18
|
Formation and growth of sub-3-nm aerosol particles in experimental chambers. Nat Protoc 2020; 15:1013-1040. [DOI: 10.1038/s41596-019-0274-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 11/27/2019] [Indexed: 11/08/2022]
|
19
|
|
20
|
Kumar M, Saiz-Lopez A, Francisco JS. Single-Molecule Catalysis Revealed: Elucidating the Mechanistic Framework for the Formation and Growth of Atmospheric Iodine Oxide Aerosols in Gas-Phase and Aqueous Surface Environments. J Am Chem Soc 2018; 140:14704-14716. [PMID: 30338993 DOI: 10.1021/jacs.8b07441] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Iodine oxide aerosols are ubiquitous in many coastal atmospheric environments. However, the exact mechanism responsible for their homogeneous nucleation and subsequent cluster growth remains to be fully established. Using quantum chemical calculations, we propose a new mechanistic framework for the formation and subsequent growth of iodine oxide aerosols, which takes advantage of noncovalent interactions between iodine oxides (I2O5 and I2O4) and iodine acids (HIO3 and HIO2). Larger iodine oxide clusters are suggested to be formed in a facile manner and with enhanced exothermicity. The newly proposed mechanisms follow both concerted and stepwise pathways. In all these new chemistries, an O:I ratio of 2-2.5 is predicted, which satisfies an experimentally derived criterion recently proposed for identifying iodine oxides involved in atmospheric aerosol formation. Born-Oppenheimer molecular dynamics simulations at the air-water interface suggest that I2O5 and I4O10, which are two of the most common nucleating iodine oxides, react with interfacial water on the picosecond time scale and result in novel nucleating species such as H2I2O6 and HI4O11- or I3O8. An important implication of these simulation results is that aqueous surfaces, which are ubiquitous in the atmosphere, may activate iodine oxides to result in a new class of nucleating compounds, which can form mixed aerosol particles with potent precursors, such as HIO3 or H2SO4, in marine air masses via typical acid-based interactions. Overall, these results give a better understanding of iodine-rich aerosols in diverse environments.
Collapse
Affiliation(s)
- Manoj Kumar
- Department of Chemistry , University of Nebraska-Lincoln , Lincoln , Nebraska 68588 , United States.,Department of Earth and Environmental Sciences , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Alfonso Saiz-Lopez
- Department of Atmospheric Chemistry and Climate , Institute of Physical Chemistry Rocasolano , CSIC, Madrid , Spain , 28006
| | - Joseph S Francisco
- Department of Chemistry , University of Nebraska-Lincoln , Lincoln , Nebraska 68588 , United States.,Department of Earth and Environmental Sciences , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| |
Collapse
|
21
|
Dall'Osto M, Beddows DCS, Asmi A, Poulain L, Hao L, Freney E, Allan JD, Canagaratna M, Crippa M, Bianchi F, de Leeuw G, Eriksson A, Swietlicki E, Hansson HC, Henzing JS, Granier C, Zemankova K, Laj P, Onasch T, Prevot A, Putaud JP, Sellegri K, Vidal M, Virtanen A, Simo R, Worsnop D, O'Dowd C, Kulmala M, Harrison RM. Novel insights on new particle formation derived from a pan-european observing system. Sci Rep 2018; 8:1482. [PMID: 29367716 PMCID: PMC5784154 DOI: 10.1038/s41598-017-17343-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 11/20/2017] [Indexed: 11/10/2022] Open
Abstract
The formation of new atmospheric particles involves an initial step forming stable clusters less than a nanometre in size (<~1 nm), followed by growth into quasi-stable aerosol particles a few nanometres (~1–10 nm) and larger (>~10 nm). Although at times, the same species can be responsible for both processes, it is thought that more generally each step comprises differing chemical contributors. Here, we present a novel analysis of measurements from a unique multi-station ground-based observing system which reveals new insights into continental-scale patterns associated with new particle formation. Statistical cluster analysis of this unique 2-year multi-station dataset comprising size distribution and chemical composition reveals that across Europe, there are different major seasonal trends depending on geographical location, concomitant with diversity in nucleating species while it seems that the growth phase is dominated by organic aerosol formation. The diversity and seasonality of these events requires an advanced observing system to elucidate the key processes and species driving particle formation, along with detecting continental scale changes in aerosol formation into the future.
Collapse
Affiliation(s)
- M Dall'Osto
- Institute of Marine Science, Consejo Superior de Investigaciones Científicas (CSIC), Barcelona, Spain. .,National Centre for Atmospheric Science Division of Environmental Health & Risk Management School of Geography, Earth & Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom. .,School of Physics, Centre for Climate & Air Pollution Studies, National University of Ireland Galway, University Road Galway, Galway, Ireland. .,Aerodyne Research, Inc., Billerica, MA, USA.
| | - D C S Beddows
- National Centre for Atmospheric Science Division of Environmental Health & Risk Management School of Geography, Earth & Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
| | - A Asmi
- Department of Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland
| | - L Poulain
- Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318, Leipzig, Germany
| | - L Hao
- University of Eastern Finland, Department of Applied Physics, P.O.Box 1627, FIN-70211, Kuopio, Finland
| | - E Freney
- Laboratoire de Météorologie Physique, CNRS-Université Blaise Pascal, UMR6016, 63117, Clermont, Ferrand, France
| | - J D Allan
- School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester, UK
| | | | - M Crippa
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232, PSI, Villigen, Switzerland.,European Commission, Joint Research Centre (JRC), Directorate for Energy, Transport and Climate, Air and Climate Unit, Via E. Fermi 2749, I-21027, Ispra, (VA), Italy
| | - F Bianchi
- Department of Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland.,Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232, PSI, Villigen, Switzerland
| | - G de Leeuw
- Finnish Meteorological Institute, Climate Change Unit, P.O. Box 503, 00101, Helsinki, Finland.,Netherlands Organisation for Applied Scientific Research TNO, Princetonlaan 6, 3508 TA, Utrecht, The Netherlands
| | - A Eriksson
- Division of Ergonomics and Aerosol Technology, Lund University, Box 118, SE-22100, Lund, Sweden
| | - E Swietlicki
- Division of Nuclear Physics, Lund University, Box 118, SE-22100, Lund, Sweden
| | - H C Hansson
- Department of Environmental Science and Analytical Chemistry, Stockholm University, 10691, Stockholm, Sweden
| | - J S Henzing
- Netherlands Organisation for Applied Scientific Research TNO, Princetonlaan 6, 3508 TA, Utrecht, The Netherlands
| | - C Granier
- Laboratoire d'Aérologie, Toulouse, France.,NOAA Earth System Laboratory and CIRES, University of Colorado, Boulder, USA
| | - K Zemankova
- Charles University, Faculty of Mathematics and Physics, Dept. of Atmospheric Physcis, Prague, Czechia
| | - P Laj
- Department of Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland.,Univ. Grenoble-Alpes, CNRS, IRD, INPG, Institut des Géosciences de l'Environnement, Grenoble, France.,Univ. Grenoble-Alpes, CNRS, IRD, Observatoire des Sciences de l'Univers, Grenoble, France
| | - T Onasch
- Aerodyne Research, Inc., Billerica, MA, USA
| | - A Prevot
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232, PSI, Villigen, Switzerland
| | - J P Putaud
- European Commission, Joint Research Centre, Institute for Environment and Sustainability, 21027, (VA), Italy
| | - K Sellegri
- Laboratoire de Météorologie Physique, CNRS-Université Blaise Pascal, UMR6016, 63117, Clermont, Ferrand, France
| | - M Vidal
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Universitat de Barcelona, Av. Diagonal 643, 08028, Barcelona, Catalonia, Spain
| | - A Virtanen
- University of Eastern Finland, Department of Applied Physics, P.O.Box 1627, FIN-70211, Kuopio, Finland
| | - R Simo
- Institute of Marine Science, Consejo Superior de Investigaciones Científicas (CSIC), Barcelona, Spain
| | - D Worsnop
- Aerodyne Research, Inc., Billerica, MA, USA.,Department of Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland
| | - C O'Dowd
- School of Physics, Centre for Climate & Air Pollution Studies, National University of Ireland Galway, University Road Galway, Galway, Ireland
| | - M Kulmala
- Department of Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland
| | - Roy M Harrison
- National Centre for Atmospheric Science Division of Environmental Health & Risk Management School of Geography, Earth & Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom.,Department of Environmental Sciences / Center of Excellence in Environmental Studies, King Abdulaziz University, PO Box 80203, 21589, Jeddah, Saudi Arabia
| |
Collapse
|
22
|
Schmitz G, Noszticzius Z, Hollo G, Wittmann M, Furrow SD. Reactions of iodate with iodine in concentrated sulfuric acid. Formation of I(+3) and I(+1) compounds. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2017.10.055] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
23
|
Sztáray B, Voronova K, Torma KG, Covert KJ, Bodi A, Hemberger P, Gerber T, Osborn DL. CRF-PEPICO: Double velocity map imaging photoelectron photoion coincidence spectroscopy for reaction kinetics studies. J Chem Phys 2017; 147:013944. [DOI: 10.1063/1.4984304] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Bálint Sztáray
- Department of Chemistry, University of the Pacific, Stockton, California 95211, USA
| | - Krisztina Voronova
- Department of Chemistry, University of the Pacific, Stockton, California 95211, USA
| | - Krisztián G. Torma
- Department of Chemistry, University of the Pacific, Stockton, California 95211, USA
| | - Kyle J. Covert
- Department of Chemistry, University of the Pacific, Stockton, California 95211, USA
| | - Andras Bodi
- Laboratory for Femtochemistry and Synchrotron Radiation, Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
| | - Patrick Hemberger
- Laboratory for Femtochemistry and Synchrotron Radiation, Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
| | - Thomas Gerber
- Laboratory for Femtochemistry and Synchrotron Radiation, Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
| | - David L. Osborn
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, USA
| |
Collapse
|
24
|
Girault N, Bosland L, Dienstbier J, Dubourg R, Fiche C. LWR Severe Accident Simulation Fission Product Behavior in FPT2 Experiment. NUCL TECHNOL 2017. [DOI: 10.13182/nt10-a9375] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- N. Girault
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN) BP3 - 13115, St.-Paul-lez-Durance, France
| | - L. Bosland
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN) BP3 - 13115, St.-Paul-lez-Durance, France
| | | | - R. Dubourg
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN) BP3 - 13115, St.-Paul-lez-Durance, France
| | - C. Fiche
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN) BP3 - 13115, St.-Paul-lez-Durance, France
| |
Collapse
|
25
|
Wei N, Hu C, Zhou S, Ma Q, Mikuška P, Večeřa Z, Gai Y, Lin X, Gu X, Zhao W, Fang B, Zhang W, Chen J, Liu F, Shan X, Sheng L. VUV photoionization aerosol mass spectrometric study on the iodine oxide particles formed from O 3-initiated photooxidation of diiodomethane (CH 2I 2). RSC Adv 2017. [DOI: 10.1039/c7ra11413c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
IOPs formed from O3-initiated photooxidation of CH2I2 were investigated based on the combination of a thermal desorption/tunable vacuum ultraviolet time-of-flight photoionization aerosol mass spectrometer with a flow reactor for the first time.
Collapse
|
26
|
Ortega A, Shingler T, Crosbie E, Wonaschütz A, Froyd K, Gao RS, Schwarz J, Perring A, Beyersdorf A, Ziemba L, Jimenez J, Jost PC, Wisthaler A, Russell L, Sorooshian A. Ambient observations of sub-1.0 hygroscopic growth factor and f(RH) values: Case studies from surface and airborne measurements. JOURNAL OF GEOPHYSICAL RESEARCH. ATMOSPHERES : JGR 2016; 121:661-677. [PMID: 33489645 PMCID: PMC7821680 DOI: 10.1002/2016jd025471] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
This study reports on the first set of ambient observations of sub-1.0 hygroscopicity values (i.e., growth factor, ratio of humidified-to-dry diameter, GF=D p,wet /D p,dry and f(RH), ratio of humidified-to-dry scattering coefficients, less than 1) with consistency across different instruments, regions, and platforms. We utilized data from (i) a shipboard humidified tandem differential mobility analyzer (HTDMA) during Eastern Pacific Emitted Aerosol Cloud Experiment (E-PEACE) in 2011, (ii) multiple instruments on the DC-8 aircraft during Studies of Emissions, Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC4RS) in 2013, as well as (iii) the Differential Aerosol Sizing and Hygroscopicity Spectrometer Probe (DASH-SP) during measurement intensives during Summer 2014 and Winter 2015 in Tucson, Arizona. Sub-1.0 GFs were observed across the range of relative humidity (RH) investigated (75-95%), and did not show a RH-dependent trend in value below 1.0 or frequency of occurrence. A commonality between suppressed hygroscopicity in these experiments, including sub-1.0 GF, was the presence of smoke. Evidence of externally mixed aerosol, and thus multiple GFs, was observed during smoke periods resulting in at least one mode with GF < 1. Time periods during which the DASH-SP detected externally mixed aerosol coincide with sub-1.0 f(RH) observations. Mechanisms responsible for sub-1.0 hygroscopicity are discussed and include refractive index (RI) modifications due to aqueous processing, particle restructuring, and volatilization effects. To further investigate ambient observations of sub-1.0 GFs, f(RH), and particle restructuring, modifying hygroscopicity instruments with pre-humidification modules is recommended.
Collapse
Affiliation(s)
- Amber Ortega
- Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ, USA
| | - Taylor Shingler
- Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ, USA
| | | | | | - Karl Froyd
- NOAA Earth System Research Laboratory, Boulder, Colorado, USA
| | - Ru-Shan Gao
- NOAA Earth System Research Laboratory, Boulder, Colorado, USA
| | - Joshua Schwarz
- NOAA Earth System Research Laboratory, Boulder, Colorado, USA
| | - Anne Perring
- NOAA Earth System Research Laboratory, Boulder, Colorado, USA
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
| | | | - Luke Ziemba
- NASA Langley Research Center, Hampton, VA, USA
| | - Jose Jimenez
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado, USA
| | - Pedro Campuzano Jost
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado, USA
| | - Armin Wisthaler
- Department of Chemistry, University of Oslo, Oslo, Norway
- Institute for Ion Physics and Applied Physics, University of Innsbruck, Innsbruck, Austria
| | - Lynn Russell
- Scripps Institution of Oceanography, University of California, San Diego, CA, USA
| | - Armin Sorooshian
- Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ, USA
- Department of Atmospheric Sciences, University of Arizona, Tucson, AZ, USA
| |
Collapse
|
27
|
Pieber SM, El Haddad I, Slowik JG, Canagaratna MR, Jayne JT, Platt SM, Bozzetti C, Daellenbach KR, Fröhlich R, Vlachou A, Klein F, Dommen J, Miljevic B, Jiménez JL, Worsnop DR, Baltensperger U, Prévôt ASH. Inorganic Salt Interference on CO 2+ in Aerodyne AMS and ACSM Organic Aerosol Composition Studies. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:10494-10503. [PMID: 27626106 DOI: 10.1021/acs.est.6b01035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Aerodyne aerosol mass spectrometer (AMS) and Aerodyne aerosol chemical speciation monitor (ACSM) mass spectra are widely used to quantify organic aerosol (OA) elemental composition, oxidation state, and major environmental sources. The OA CO2+ fragment is among the most important measurements for such analyses. Here, we show that a non-OA CO2+ signal can arise from reactions on the particle vaporizer, ion chamber, or both, induced by thermal decomposition products of inorganic salts. In our tests (eight instruments, n = 29), ammonium nitrate (NH4NO3) causes a median CO2+ interference signal of +3.4% relative to nitrate. This interference is highly variable between instruments and with measurement history (percentiles P10-90 = +0.4 to +10.2%). Other semi-refractory nitrate salts showed 2-10 times enhanced interference compared to that of NH4NO3, while the ammonium sulfate ((NH4)2SO4) induced interference was 3-10 times lower. Propagation of the CO2+ interference to other ions during standard AMS and ACSM data analysis affects the calculated OA mass, mass spectra, molecular oxygen-to-carbon ratio (O/C), and f44. The resulting bias may be trivial for most ambient data sets but can be significant for aerosol with higher inorganic fractions (>50%), e.g., for low ambient temperatures, or laboratory experiments. The large variation between instruments makes it imperative to regularly quantify this effect on individual AMS and ACSM systems.
Collapse
Affiliation(s)
- Simone M Pieber
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
| | - Imad El Haddad
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
| | - Jay G Slowik
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
| | | | - John T Jayne
- Aerodyne Research, Inc. , Billerica, Massachusetts 01821, United States
| | - Stephen M Platt
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
- Norwegian Institute for Air Research , P.O. Box 100, NO-2027 Kjeller, Norway
| | - Carlo Bozzetti
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
| | - Kaspar R Daellenbach
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
| | - Roman Fröhlich
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
| | - Athanasia Vlachou
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
| | - Felix Klein
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
| | - Josef Dommen
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
| | - Branka Miljevic
- Queensland University of Technology, International Laboratory for Air Quality and Health, Institute of Health and Biomedical Innovation , Brisbane, Queensland 4001, Australia
| | - José L Jiménez
- Department of Chemistry & Biochemistry and CIRES, University of Colorado , Boulder, Colorado 80309, United States
| | - Douglas R Worsnop
- Aerodyne Research, Inc. , Billerica, Massachusetts 01821, United States
| | - Urs Baltensperger
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
| | - André S H Prévôt
- Paul Scherrer Institute, Laboratory of Atmospheric Chemistry , CH-5232 Villigen, Switzerland
| |
Collapse
|
28
|
Molecular-scale evidence of aerosol particle formation via sequential addition of HIO 3. Nature 2016; 537:532-534. [PMID: 27580030 PMCID: PMC5136290 DOI: 10.1038/nature19314] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 07/08/2016] [Indexed: 12/28/2022]
Abstract
Homogeneous nucleation and subsequent cluster growth leads to the formation of new aerosol particles in the atmosphere1. Nucleation of sulphuric acid and organic vapours is thought to be responsible for new particle formation over continents1,2 while iodine oxide vapours have been implicated in particle formation over coastal regions3–7. Molecular clustering pathways involved in atmospheric particle formation have been elucidated in controlled laboratory studies of chemically simple systems2,8–10. But no direct molecular-level observations of nucleation in atmospheric field conditions involving either sulphuric acid, organic or iodine oxide vapours have been reported to date11. Here we report field data from Mace Head, Ireland and supporting data from northern Greenland and Queen Maud Land, Antarctica that allow for the identification of the molecular steps involved in new particle formation in an iodine-rich, coastal atmospheric environment. We find that the formation and initial growth process is almost exclusively driven by iodine oxoacids and iodine oxide vapours with average resulting cluster O:I ratios of 2.4. Based on the high O:I ratio, together with observed high concentrations of iodic acid, HIO3, we suggest that cluster formation primarily proceeds by sequential addition of iodic acid HIO3, followed by intra-cluster restructuring to I2O5 and recycling of water in the atmosphere or upon drying. Overall, our study provides ambient atmospheric molecular-level observations of nucleation, supporting the previously suggested role of iodine containing species in new particle formation3–7, 12–18, and identifies the key nucleating compound.
Collapse
|
29
|
Sturm R. A stochastic model of carbon nanotube deposition in the airways and alveoli of the human respiratory tract. Inhal Toxicol 2016; 28:49-60. [DOI: 10.3109/08958378.2015.1136009] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
30
|
Dickinson S, Auvinen A, Ammar Y, Bosland L, Clément B, Funke F, Glowa G, Kärkelä T, Powers D, Tietze S, Weber G, Zhang S. Experimental and modelling studies of iodine oxide formation and aerosol behaviour relevant to nuclear reactor accidents. ANN NUCL ENERGY 2014. [DOI: 10.1016/j.anucene.2014.05.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
31
|
Ocean–Atmosphere Interactions of Particles. OCEAN-ATMOSPHERE INTERACTIONS OF GASES AND PARTICLES 2014. [DOI: 10.1007/978-3-642-25643-1_4] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
32
|
Gómez Martín JC, Gálvez O, Baeza-Romero MT, Ingham T, Plane JMC, Blitz MA. On the mechanism of iodine oxide particle formation. Phys Chem Chem Phys 2013; 15:15612-22. [DOI: 10.1039/c3cp51217g] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
|
33
|
Gálvez O, Gómez Martín JC, Gómez PC, Saiz-Lopez A, Pacios LF. A theoretical study on the formation of iodine oxide aggregates and monohydrates. Phys Chem Chem Phys 2013; 15:15572-83. [DOI: 10.1039/c3cp51219c] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
34
|
Monahan C, Ashu-Ayem ER, Nitschke U, Darby SB, Smith PD, Stengel DB, Venables DS, O'Dowd CD. Coastal iodine emissions: part 2. Chamber experiments of particle formation from Laminaria digitata-derived and laboratory-generated I₂. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:10422-8. [PMID: 22934718 DOI: 10.1021/es3011805] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Laboratory studies into particle formation from Laminaria digitata macroalgae were undertaken to elucidate aerosol formation for a range of I(2) (0.3-76 ppb(v)) and O(3) (<3-96 ppb(v)) mixing ratios and light levels (E(PAR) = 15, 100, and 235 μmol photons m(-2) s(-1)). No clear pattern was observed for I(2) or aerosol parameters as a function of light levels. Aerosol mass fluxes and particle number concentrations, were, however, correlated with I(2) mixing ratios for low O(3) mixing ratios of <3 ppb(v) (R(2) = 0.7 and 0.83, respectively for low light levels, and R(2) = 0.95 and 0.98, respectively for medium light levels). Additional experiments into particle production as a function of laboratory-generated I(2), over a mixing ratio range of 1-8 ppb(v), were conducted under moderate O(3) mixing ratios (∼24 ppb(v)) where a clear, 100-fold or greater, increase in the aerosol number concentrations and mass fluxes was observed compared to the low O(3) experiments. A linear relationship between particle concentration and I(2) was found, in reasonable agreement with previous studies. Scaling the laboratory relationship to aerosol concentrations typical of the coastal boundary layer suggests a I(2) mixing ratio range of 6-93 ppt(v) can account for the observed particle production events. Aerosol number concentration produced from I(2) is more than a factor of 10 higher than that produced from CH(2)I(2) for the same mixing ratios.
Collapse
Affiliation(s)
- Ciaran Monahan
- School of Physics and Centre for Climate & Air Pollution Studies, Ryan Institute, National University of Ireland Galway, University Road, Galway, Ireland
| | | | | | | | | | | | | | | |
Collapse
|
35
|
Pikridas M, Riipinen I, Hildebrandt L, Kostenidou E, Manninen H, Mihalopoulos N, Kalivitis N, Burkhart JF, Stohl A, Kulmala M, Pandis SN. New particle formation at a remote site in the eastern Mediterranean. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2012jd017570] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
36
|
Funke F, Langrock G, Kanzleiter T, Poss G, Fischer K, Kühnel A, Weber G, Allelein HJ. Iodine oxides in large-scale THAI tests. NUCLEAR ENGINEERING AND DESIGN 2012. [DOI: 10.1016/j.nucengdes.2012.01.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
37
|
Girault N, Bosland L, Dickinson S, Funke F, Güntay S, Herranz L, Powers D. LWR severe accident simulation: Iodine behaviour in FPT2 experiment and advances on containment iodine chemistry. NUCLEAR ENGINEERING AND DESIGN 2012. [DOI: 10.1016/j.nucengdes.2011.11.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
38
|
Zhang R, Khalizov A, Wang L, Hu M, Xu W. Nucleation and growth of nanoparticles in the atmosphere. Chem Rev 2011; 112:1957-2011. [PMID: 22044487 DOI: 10.1021/cr2001756] [Citation(s) in RCA: 469] [Impact Index Per Article: 36.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Renyi Zhang
- Department of Atmospheric Sciences and Department of Chemistry, Center for Atmospheric Chemistry and Environment, Texas A&M University, College Station, Texas 77843, USA.
| | | | | | | | | |
Collapse
|
39
|
Saiz-Lopez A, Plane JMC, Baker AR, Carpenter LJ, von Glasow R, Gómez Martín JC, McFiggans G, Saunders RW. Atmospheric Chemistry of Iodine. Chem Rev 2011; 112:1773-804. [DOI: 10.1021/cr200029u] [Citation(s) in RCA: 383] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Alfonso Saiz-Lopez
- Laboratory for Atmospheric and Climate Science (CIAC), CSIC, Toledo, Spain
| | - John M. C. Plane
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Alex R. Baker
- School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom
| | - Lucy J. Carpenter
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Roland von Glasow
- School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom
| | | | - Gordon McFiggans
- School of Earth, Atmospheric & Environmental Sciences, University of Manchester, Manchester, M13 9PL, United Kingdom
| | | |
Collapse
|
40
|
Kessler SH, Nah T, Carrasquillo AJ, Jayne JT, Worsnop DR, Wilson KR, Kroll JH. Formation of Secondary Organic Aerosol from the Direct Photolytic Generation of Organic Radicals. J Phys Chem Lett 2011; 2:1295-1300. [PMID: 26295424 DOI: 10.1021/jz200432n] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The immense complexity inherent in the formation of secondary organic aerosol (SOA)-due primarily to the large number of oxidation steps and reaction pathways involved-has limited the detailed understanding of its underlying chemistry. As a means of simplifying such complexity, here we demonstrate the formation of SOA through the photolysis of gas-phase alkyl iodides, which generates organic peroxy radicals of known structure. In contrast to standard OH-initiated oxidation experiments, photolytically initiated oxidation forms a limited number of products via a single reactive step. As is typical for SOA, the yields of aerosol generated from the photolysis of alkyl iodides depend on aerosol loading, indicating the semivolatile nature of the particulate species. However, the aerosol was observed to be higher in volatility and less oxidized than in previous multigenerational studies of alkane oxidation, suggesting that additional oxidative steps are necessary to produce oxidized semivolatile material in the atmosphere. Despite the relative simplicity of this chemical system, the SOA mass spectra are still quite complex, underscoring the wide range of products present in SOA.
Collapse
Affiliation(s)
| | - Theodora Nah
- ‡Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley California 94720, United States
- §Department of Chemistry, University of California, Berkeley, California 94720, United States
| | | | - John T Jayne
- #Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, Massachusetts 01821, United States
| | - Douglas R Worsnop
- #Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, Massachusetts 01821, United States
| | - Kevin R Wilson
- ‡Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley California 94720, United States
| | | |
Collapse
|
41
|
Yokouchi Y, Saito T, Ooki A, Mukai H. Diurnal and seasonal variations of iodocarbons (CH2ClI, CH2I2, CH3I, and C2H5I) in the marine atmosphere. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010jd015252] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
42
|
De Haan DO, Hawkins LN, Kononenko JA, Turley JJ, Corrigan AL, Tolbert MA, Jimenez JL. Formation of nitrogen-containing oligomers by methylglyoxal and amines in simulated evaporating cloud droplets. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:984-91. [PMID: 21171623 DOI: 10.1021/es102933x] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Reactions of methylglyoxal with amino acids, methylamine, and ammonium sulfate can take place in aqueous aerosol and evaporating cloud droplets. These processes are simulated by drying droplets and bulk solutions of these compounds (at low millimolar and 1 M concentrations, respectively) and analyzing the residuals by scanning mobility particle sizing, nuclear magnetic resonance, aerosol mass spectrometry (AMS), and electrospray ionization MS. The results are consistent with imine (but not diimine) formation on a time scale of seconds, followed by the formation of nitrogen-containing oligomers, methylimidazole, and dimethylimidazole products on a time scale of minutes to hours. Measured elemental ratios are consistent with imidazoles and oligomers being major reaction products, while effective aerosol densities suggest extensive reactions take place within minutes. These reactions may be a source of the light-absorbing, nitrogen-containing oligomers observed in urban and biomass-burning aerosol particles.
Collapse
Affiliation(s)
- David O De Haan
- Department of Chemistry and Biochemistry, University of San Diego, San Diego, California 92110, United States.
| | | | | | | | | | | | | |
Collapse
|
43
|
Kiselev A, Wennrich C, Stratmann F, Wex H, Henning S, Mentel TF, Kiendler-Scharr A, Schneider J, Walter S, Lieberwirth I. Morphological characterization of soot aerosol particles during LACIS Experiment in November (LExNo). ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd012635] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
44
|
Pacios LF, Gálvez O. Active Site, Catalytic Cycle, and Iodination Reactions of Vanadium Iodoperoxidase: A Computational Study. J Chem Theory Comput 2010; 6:1738-52. [DOI: 10.1021/ct100041x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Luis F. Pacios
- Departamento de Biotecnología, Unidad de Química y Bioquímica, E.TSI Montes, Universidad Politécnica de Madrid, 28040 Madrid, Spain, and Departamento de Física Molecular, Instituto de Estructura de la Materia, C.S.I.C., Serrano 121, 28006 Madrid, Spain
| | - Oscar Gálvez
- Departamento de Biotecnología, Unidad de Química y Bioquímica, E.TSI Montes, Universidad Politécnica de Madrid, 28040 Madrid, Spain, and Departamento de Física Molecular, Instituto de Estructura de la Materia, C.S.I.C., Serrano 121, 28006 Madrid, Spain
| |
Collapse
|
45
|
De Haan DO, Corrigan AL, Tolbert MA, Jimenez JL, Wood SE, Turley JJ. Secondary organic aerosol formation by self-reactions of methylglyoxal and glyoxal in evaporating droplets. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2009; 43:8184-90. [PMID: 19924942 DOI: 10.1021/es902152t] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Glyoxal and methylglyoxal are scavenged by clouds, where a fraction of these compounds are oxidized during the lifetime of the droplet. As a cloud droplet evaporates, the remaining glyoxal and methylglyoxal must either form low-volatility compounds such as oligomers and remain in the aerosol phase, or transfer back to the gas phase. A series of experiments on evaporating aqueous aerosol droplets indicates that over the atmospherically relevant concentration range for clouds and fog (4-1000 microM), 33 +/- 11% of glyoxal and 19 +/- 13% of methylglyoxal remains in the aerosol phase while the remainder evaporates. Measurements of aerosol density and time-dependent AMS signal changes are consistent with the formation of oligomers by each compound during the drying process. Unlike glyoxal, which forms acetal oligomers, exact mass AMS data indicates that the majority of methylglyoxal oligomers are formed by aldol condensation reactions, likely catalyzed by pyruvic acid, formed from methylglyoxal disproportionation. Our measurements of evaporation fractions can be used to estimate the global aerosol formation potential of glyoxal and methylglyoxal via self-reactions at 1 and 1.6 Tg C yr(-1), respectively. This is a factor of 4 less than the SOA formed by these compounds if their uptake is assumed to be irreversible. However, these estimates are likely lower limits for their total aerosol formation potential because oxidants and amines will also react with glyoxal and methylglyoxal to form additional low-volatility products.
Collapse
Affiliation(s)
- David O De Haan
- Department of Chemistry and Biochemistry, University of San Diego, USA.
| | | | | | | | | | | |
Collapse
|
46
|
Sakamoto Y, Yabushita A, Kawasaki M, Nakayama T, Matsumi Y. Optical Properties and Chemical Compositions of Iodine-Containing Aerosols Produced from the Atmospheric Photolysis of Methylene Iodide in the Presence of Ozone. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2009. [DOI: 10.1246/bcsj.82.910] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
47
|
Vuollekoski H, Kerminen VM, Anttila T, Sihto SL, Vana M, Ehn M, Korhonen H, McFiggans G, O'Dowd CD, Kulmala M. Iodine dioxide nucleation simulations in coastal and remote marine environments. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jd010713] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
48
|
Lun X, Takami A, Miyoshi T, Hatakeyama S. Characteristic of organic aerosol in a remote area of Okinawa Island. J Environ Sci (China) 2009; 21:1371-1377. [PMID: 19999991 DOI: 10.1016/s1001-0742(08)62428-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A continuous investigation of aerosol pollutants in Cape Hedo, Japan was conducted from October 2005 to August 2006 by Aerodyne aerosol mass spectrometer (AMS). This article focused on the analysis of long-range transport of organic aerosol from continental origin to the remote island. Based on the transport distance and air mass origin, four main air mass origins were considered, including North China, South China, Japan and Korea. Although the mass concentration and air mass origin were quite different during study period, the mass spectrum and size distribution of organic matter and oxidized organics were similar, which showed uni-modal distribution with modal diameter of around 500 nm. The loss rate of organics was (5.15 +/- 0.55) x 10(-6) s(-1) obtained by plotting the concentration against the transport time. Conversion rate of SO2 to sulfate and oxidation rate of organics were (1.07 +/- 0.15) x 10(-5) and (1.09 +/- 0.52) x 10(-6) s(-1), respectively.
Collapse
Affiliation(s)
- Xiaoxiu Lun
- Beijing Forestry University, Beijing 100083, China.
| | | | | | | |
Collapse
|
49
|
Chapter 1 Multireference and Spin–Orbit Calculations on Photodissociations of Hydrocarbon Halides. ADVANCES IN QUANTUM CHEMISTRY 2009. [DOI: 10.1016/s0065-3276(08)00401-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
|
50
|
Zelenyuk A, Yang J, Song C, Zaveri RA, Imre D. A new real-time method for determining particles' sphericity and density: application to secondary organic aerosol formed by ozonolysis of alpha-pinene. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2008; 42:8033-8038. [PMID: 19031898 DOI: 10.1021/es8013562] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Particle volumes are most often obtained by measuring particle mobility size distributions and assuming that the particles are spherical. Particle volumes are then converted to mass loads by using particle densities that are commonly estimated from measured mobility and vacuum aerodynamic diameters, assuming that the particles are spherical. For aspherical particles, these assumptions can introduce significant errors. We present in this work a new method that can be applied to any particle system to determine in real time whether the particles are spherical or not. We use our second-generation single particle mass spectrometer (SPLAT II) to measure with extremely high precision the vacuum aerodynamic size distributions of particles that are classified by differential mobility analyzer and demonstrate that the line shape of these vacuum aerodynamic size distributions provide a way to unambiguously distinguish between spherical and aspherical particles. Moreover, the very same experimental system is used to obtain the size, density, composition, and dynamic shape factors of individual particles. We present an application of this method to secondary organic aerosols that are formed as a result of ozonolysis of alpha-pinene in the presence and absence of an OH scavenger and find these particles to be spherical with densities of 1.198 +/- 0.004 and 1.213 +/- 0.003 g cm(-3), respectively.
Collapse
Affiliation(s)
- Alla Zelenyuk
- Pacific Northwest National Laboratory, Richland, WA 99354, USA.
| | | | | | | | | |
Collapse
|