Journal ArticleDOI
Colorimetric Particle Acidity Analysis of Secondary Organic Aerosol Coating on Submicron Acidic Aerosols
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TLDR
In this paper, the particle acidity of secondary organic aerosol (SOA) created from ozonolysis of α-pinene in the presence of acidic inorganic seed aerosols was investigated using an indoor Teflon film chamber.Abstract:
The particle acidity of secondary organic aerosol (SOA) created from ozonolysis of α-pinene in the presence of acidic inorganic seed aerosols was investigated using an indoor Teflon film chamber. Colorimetry integrated with a reflectance UV-Visible spectrometer was used for the first time to dynamically measure the aerosol acidity over time. An external calibration curve was produced based on the correlation between the proton mass (ng) collected on the filter, which was impregnated with metanil yellow, and the absorbance of the reflectance UV-Visible spectra for the protonated and the unprotonated metanil yellow on the filter. Using this calibration curve, the particle acidity of the submicron acidic sulfate aerosol coated with SOA was measured from the reflectance UV-Visible spectra of filter samples. The colorimetric analysis requires a short sampling time (less than 2 m) for SOA studies using the laboratory Teflon film chamber and eliminates extraction of the filter sample with water. Results show tha...read more
Citations
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Journal ArticleDOI
The formation, properties and impact of secondary organic aerosol: current and emerging issues
Mattias Hallquist,John C. Wenger,Urs Baltensperger,Yinon Rudich,David Simpson,David Simpson,Magda Claeys,J. Dommen,Neil M. Donahue,Christian George,Christian George,Allen H. Goldstein,Jacqueline F. Hamilton,Hartmut Herrmann,Thorsten Hoffmann,Yoshiteru Iinuma,Myoseon Jang,Michael E. Jenkin,Jose L. Jimenez,Astrid Kiendler-Scharr,Willy Maenhaut,Gordon McFiggans,Th. F. Mentel,Anne Monod,André S. H. Prévôt,John H. Seinfeld,Jason D. Surratt,Rafal Szmigielski,Jürgen Wildt +28 more
TL;DR: In this article, an overview of the atmospheric degradation mechanisms for SOA precursors, gas-particle partitioning theory and analytical techniques used to determine the chemical composition of SOA is presented.
Journal ArticleDOI
The acidity of atmospheric particles and clouds
Havala O. T. Pye,Athanasios Nenes,Becky Alexander,Andrew P. Ault,Mary C. Barth,Simon L. Clegg,Jeffrey L. Collett,Kathleen M. Fahey,Christopher J. Hennigan,Hartmut Herrmann,Maria Kanakidou,James T. Kelly,I-Ting Ku,V. Faye McNeill,Nicole Riemer,Thomas Schaefer,Guo-Liang Shi,Andreas Tilgner,John T. Walker,Tao Wang,Rodney J. Weber,Jia Xing,Rahul A. Zaveri,Andreas Zuend +23 more
TL;DR: This paper reviews and synthesizes the current state of knowledge on the acidity of atmospheric condensed phases, specifically particles and cloud droplets, including recommendations for estimating acidity and pH, standard nomenclature, a synthesis of current pH estimates based on observations, and new model calculations on the local and global scale.
Journal ArticleDOI
A critical evaluation of proxy methods used to estimate the acidity of atmospheric particles
Christopher J. Hennigan,J. Izumi,Amy P. Sullivan,Rodney J. Weber,Athanasios Nenes,Athanasios Nenes +5 more
TL;DR: In this article, the authors evaluated four of the most common aerosol acidity proxies: ion balance method, molar ratio method, thermodynamic equilibrium models, and phase partitioning of ammonia.
Journal ArticleDOI
Direct Determination of Aerosol pH: Size-Resolved Measurements of Submicrometer and Supermicrometer Aqueous Particles.
Rebecca L. Craig,Peter K. Peterson,Lucy Nandy,Ziying Lei,Mohammed A. Hossain,Stephanie Camarena,Ryan A. Dodson,Ryan D. Cook,Cari S. Dutcher,Andrew P. Ault +9 more
TL;DR: A novel and facile method for direct measurement of size-resolved aerosol acidity from pH 0 to 4.5 is presented using quantitative colorimetric image processing of cellular phone images of (NH4)2SO4-H2 SO4 aqueous aerosol particles impacted onto pH-indicator paper.
Journal ArticleDOI
Direct Measurement of pH in Individual Particles via Raman Microspectroscopy and Variation in Acidity with Relative Humidity
Joel D. Rindelaub,Rebecca L. Craig,Lucy Nandy,Amy L. Bondy,Cari S. Dutcher,Paul B. Shepson,Andrew P. Ault +6 more
TL;DR: Raman microspectroscopy was used to determine the pH of individual particles based on sulfate and bisulfate concentrations determined from νs(SO4(2-)) and νS(HSO4(-)), the acid dissociation constant, and activity coefficients from extended Debye-Hückel calculations, indicating the potential for direct spectroscopic determination of pH in individual particles.
References
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Journal ArticleDOI
Organic aerosol and global climate modelling: a review
Maria Kanakidou,John H. Seinfeld,Spyros N. Pandis,Ian Barnes,Frank Dentener,Maria Cristina Facchini,R. Van Dingenen,Barbara Ervens,Athanasios Nenes,Claus J. Nielsen,Erik Swietlicki,J. P. Putaud,Yves Balkanski,Sandro Fuzzi,J. Horth,Geert K. Moortgat,R. Winterhalter,Cathrine Lund Myhre,Kostas Tsigaridis,Elisabetta Vignati,Euripides G. Stephanou,J. Wilson +21 more
TL;DR: In this article, the authors reviewed existing knowledge with regard to organic aerosol (OA) of importance for global climate modelling and defined critical gaps needed to reduce the involved uncertainties, and synthesized the information to provide a continuous analysis of the flow from the emitted material to the atmosphere up to the point of the climate impact of the produced organic aerosols.
Journal ArticleDOI
ISORROPIA: A New Thermodynamic Equilibrium Model for Multiphase Multicomponent Inorganic Aerosols
TL;DR: In this article, a computationally efficient and rigorous thermodynamic model that predicts the physical state and composition of inorganic atmospheric aerosol is presented, where the main features of the model is the implementation of mutual deliquescence of multicomponent salt particles.
Journal ArticleDOI
Heterogeneous Atmospheric Aerosol Production by Acid-Catalyzed Particle-Phase Reactions
TL;DR: If acid-catalyzed heterogeneous reactions of SOA products are included in current models, the predicted SOA formation will be much greater and could have a much larger impact on climate forcing effects than the authors now predict.
Journal ArticleDOI
Identification of polymers as major components of atmospheric organic aerosols.
Markus Kalberer,D. Paulsen,Mirjam Sax,Martin Steinbacher,Josef Dommen,André S. H. Prévôt,R. Fisseha,Ernest Weingartner,Vladimir Frankevich,Renato Zenobi,Urs Baltensperger +10 more
TL;DR: Results from photooxidation of aromatic compounds in a reaction chamber show that a substantial fraction of the organic aerosol mass is composed of polymers, which results in a lower volatility of this secondaryorganic aerosol and a higher aerosol yield than a model using vapor pressures of individual organic species would predict.
Journal ArticleDOI
Evidence for organosulfates in secondary organic aerosol.
Jason D. Surratt,Jesse H. Kroll,Tadeusz E. Kleindienst,Edward O. Edney,Magda Claeys,Armin Sorooshian,Nga L. Ng,John H. Offenberg,Michael Lewandowski,Mohammed Jaoui,Richard C. Flagan,John H. Seinfeld +11 more
TL;DR: Sulfate esters are found to account for a larger fraction of the SOA mass when the acidity of seed aerosol is increased, a result consistent with aerosol acidity increasing SOA formation.