Changes in the optical properties of benzo[a]pyrene-coated aerosols upon heterogeneous reactions with NO2 and NO3

Lu, Jessica W.; Flores, J. Michel; Lavi, Avi; Abo-Riziq, Ali; Rudich, Yinon

doi:10.1039/c0cp02114h

Cited by 59 publications

(64 citation statements)

References 80 publications

(88 reference statements)

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“…Recently, several groups have used Aerosol CRDS (A-CRDS) to probe internal and external particle mixing Freedman et al 2009;Khalizov et al 2009;Lack et al 2009;Radney et al 2009;Attwood and Greenslade, 2012), effects of relative humidity (Beaver et al 2008;Attwood and Greenslade, 2012;Brem et al 2012;Trainic et al 2012) and particle reactivity (Lu et al 2011;Zarzana et al 2012). Agreement between extinction cross section measurements and those calculated with Mie theory is often promising, typically on the order of 2-12 % (Pettersson et al 2004;Baynard et al 2007;Riziq et al 2007;Freedman et al 2009;Lang-Yona et al 2009;Radney et al 2009;Miles et al 2010b;Li et al 2011;Mellon et al 2011).…”

Section: Introductionmentioning

confidence: 93%

A Calibration Technique for Improving Refractive Index Retrieval from Aerosol Cavity Ring-Down Spectroscopy

Toole¹,

Renbaum-Wolff

Smith³

2013

Aerosol Science and Technology

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Cavity ring-down spectroscopy (CRDS) is a technique that is commonly used to measure the extinction of light by aerosol particles in situ. This extinction, when normalized to particle concentration, yields the extinction cross section, a measure of a single particle's ability to scatter and absorb light. The complex index of refraction can then be retrieved by comparison of the extinction cross sections at several particle diameters with those predicted by Mie theory. This approach requires accurate determination of particle diameter and concentration as well as the length of the extinction region in the cavity, but it is often difficult to quantify the systematic errors in the measurements of these quantities. Here, we introduce a calibration technique using particles of a reference compound to account for these systematic errors. The two calibration parameters are: C f , which scales the measured extinction cross sections, and d, which shifts the particle diameters. It is found that C f correlates strongly with the condensation particle counter (CPC) used to measure particle concentration and that d is associated with the differential mobility analyzer (DMA) used to select particle diameters. Calibration is shown to reduce errors of subsequently-measured extinction cross sections of a test aerosol from 11% to <2% with a concomitant improvement in the accuracy of the retrieved complex index of refraction and corresponding atmospheric radiative forcing estimates.

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Section: Introductionmentioning

confidence: 93%

A Calibration Technique for Improving Refractive Index Retrieval from Aerosol Cavity Ring-Down Spectroscopy

Toole¹,

Renbaum-Wolff

Smith³

2013

Aerosol Science and Technology

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“…In their measurements, k organic initially increased with OH-aging then reached a plateau, whereas the particle volatility continued to drop. Lu et al [251] quantified s ext , using cavity ring-down spectroscopy, and s a , using photoacoustic spectroscopy for benzo [a]pyrene-coated particles during their reaction with NO 2 and NO 3 . When some benzo[a]pyrene in particles was nitrated, evident by the parallel AMS measurements, both the scattering and absorption coefficients increased.…”

Section: Optical and Hygroscopic Properties Of Aerosolsmentioning

confidence: 99%

Mass spectrometric approaches for chemical characterisation of atmospheric aerosols: critical review of the most recent advances

Laskin¹,

Laskin²,

Nizkorodov³

2012

Environ. Chem.

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Environmental context. Atmospheric aerosols have profound effects on the environment through several physicochemical processes, such as absorption and scattering of sunlight, heterogeneous gas-particle reactions and adverse effects on the respiratory and cardiovascular systems. Understanding aerosol atmospheric chemistry and its environmental impact requires comprehensive characterisation of the physical and chemical properties of particles. Results from mass spectrometry provide important new insights into the origin of atmospheric aerosols, the evolution of their physicochemical properties, their reactivity and their effect on the environment.Abstract. This manuscript presents an overview of the most recent instrument developments for the field and laboratory applications of mass spectrometry (MS) to investigate the chemistry and physics of atmospheric aerosols. A range of MS instruments, employing different sample introduction methods, ionisation and mass detection techniques are used both for 'online' and 'offline' characterisation of aerosols. Online MS techniques enable detection of individual particles with simultaneous measurement of particle size distributions and aerodynamic characteristics and are ideally suited for field studies that require high temporal resolution. Offline MS techniques provide a means for detailed molecular-level analysis of aerosol samples, which is essential to gain fundamental knowledge regarding aerosol chemistry, mechanisms of particle formation and atmospheric aging. Combined, complementary MS techniques provide comprehensive information on the chemical composition, size, morphology and phase of aerosols -data of key importance for evaluating hygroscopic and optical properties of particles, their health effects, understanding their origins and atmospheric evolution. Over the last few years, developments and applications of MS techniques in aerosol research have expanded remarkably as evident by skyrocketing publication statistics. The goal of this review is to present the most recent developments in the field of aerosol mass spectrometry for the time period of late 2010 to early 2012, which have not been conveyed in previous reviews.

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“…aerosols such as toxicity, reactivity, ice and cloud condensation nucleation abilities, and radiative properties (FinlaysonPitts and Pitts, 1997;George and Abbatt, 2010b;Kolb et al, 2010;Kuwata et al, 2011;Lu et al, 2011;Schwier et al, 2011;Wang and Knopf, 2011;Shiraiwa et al, 2012). Gasparticle partitioning of semi-volatile species is a key process for formation and aging of secondary organic aerosol (Odum et al, 1996;Seinfeld and Pankow, 2003;Donahue et al, 2006;Robinson et al, 2007;Hallquist et al, 2009;Jimenez et al, 2009;Riipinen et al, 2011).…”

mentioning

confidence: 99%

Kinetic multi-layer model of gas-particle interactions in aerosols and clouds (KM-GAP): linking condensation, evaporation and chemical reactions of organics, oxidants and water

et al. 2012

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Abstract. We present a novel kinetic multi-layer model for gas-particle interactions in aerosols and clouds (KM-GAP) that treats explicitly all steps of mass transport and chemical reaction of semi-volatile species partitioning between gas phase, particle surface and particle bulk. KM-GAP is based on the PRA model framework (Pöschl-RudichAmmann, 2007), and it includes gas phase diffusion, reversible adsorption, surface reactions, bulk diffusion and reaction, as well as condensation, evaporation and heat transfer. The size change of atmospheric particles and the temporal evolution and spatial profile of the concentration of individual chemical species can be modeled along with gas uptake and accommodation coefficients. Depending on the complexity of the investigated system and the computational constraints, unlimited numbers of semi-volatile species, chemical reactions, and physical processes can be treated, and the model shall help to bridge gaps in the understanding and quantification of multiphase chemistry and microphysics in atmospheric aerosols and clouds.In this study we demonstrate how KM-GAP can be used to analyze, interpret and design experimental investigations of changes in particle size and chemical composition in response to condensation, evaporation, and chemical reaction. For the condensational growth of water droplets, our kinetic model results provide a direct link between laboratory observations and molecular dynamic simulations, confirming that the accommodation coefficient of water at ∼270 K is close to unity (Winkler et al., 2006). Literature data on the evaporation of dioctyl phthalate as a function of particle size and time can be reproduced, and the model results suggest that changes in the experimental conditions like aerosol particle concentration and chamber geometry may influence the evaporation kinetics and can be optimized for efficient probing of specific physical effects and parameters. With regard to oxidative aging of organic aerosol particles, we illustrate how the formation and evaporation of volatile reaction products like nonanal can cause a decrease in the size of oleic acid particles exposed to ozone.

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Changes in the optical properties of benzo[a]pyrene-coated aerosols upon heterogeneous reactions with NO2 and NO3

Cited by 59 publications

References 80 publications

A Calibration Technique for Improving Refractive Index Retrieval from Aerosol Cavity Ring-Down Spectroscopy

A Calibration Technique for Improving Refractive Index Retrieval from Aerosol Cavity Ring-Down Spectroscopy

Mass spectrometric approaches for chemical characterisation of atmospheric aerosols: critical review of the most recent advances

Kinetic multi-layer model of gas-particle interactions in aerosols and clouds (KM-GAP): linking condensation, evaporation and chemical reactions of organics, oxidants and water

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