FTIR Analysis of Aerosol Formed in the Photooxidation of Naphthalene

Dekermenjian, Manuel; Allen, David T.; Atkinson, Roger; Arey, Janet

doi:10.1080/027868299304624

Cited by 23 publications

(15 citation statements)

References 14 publications

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“…Thus, whenever organonitrate functional groups due to SOA formation are observed, significant concentrations of carbonyl groups would also be expected. This has been confirmed in environmental chamber experiments (Holes et al 1997;Dekermenjian et al 1999;Palen et al 1993), with molar ratios of organonitrate to carbonyl groups averaging about 0.1. Most of the Houston data conform to these expectations, but the data observed during the 8-14 August episode show much higher organonitrate concentrations than would be expected based on current our understanding of SOA formation.…”

Section: -14 August 2000supporting

confidence: 61%

Size Distributions of Organic Functional Groups in Ambient Aerosol Collected in Houston, Texas Special Issue ofAerosol Science and Technologyon Findings from the Fine Particulate Matter Supersites Program

Laurent

Allen

2004

Aerosol Science and Technology

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The size distributions of aliphatic carbon, carbonyl, and organonitrate functional groups in ambient aerosol were determined at three sites during an air quality field study conducted during August and September 2000, in Houston, Texas. Samples were collected using a Hering low-pressure impactor and were analyzed, in transmission mode, using Fourier transform infrared spectroscopy. The submicron fractions of the samples exhibited patterns seen in other urban areas. Carbonyl and organonitrate group absorbances showed maxima in the 0.05-0.26 µm and the 0.5-1.0 µm size fractions, and based on these absorbances appear to be primarily due to secondary organic aerosol. Aliphatic carbon absorbances in the submicron aerosol showed maxima in the 0.076-0.12 µm size fraction and the 0.5-1.0 µm size fraction. Weak correlation between ozone concentrations and aliphatic carbon absorbances suggest that some of these aliphatic functional groups are due to primary emissions. For the supermicron aerosol, all three functional groups exhibit maxima in the 2-4 µm size fraction. These coarse size fractions observed in Houston were not observed in similar samples collected in Los Angeles. In addition, some of the aerosol samples collected in Houston display organic functional group concentrations, especially for organonitrates, that are significantly higher than the median concentrations. Samples with very high organic functional group concentrations had molar ratios of carbonyl and organonitrate functional groups that are suggestive of either primary emissions or secondary organic aerosol formation processes that are not commonly observed in other urban areas.

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Section: -14 August 2000supporting

confidence: 61%

Size Distributions of Organic Functional Groups in Ambient Aerosol Collected in Houston, Texas Special Issue ofAerosol Science and Technologyon Findings from the Fine Particulate Matter Supersites Program

Laurent

Allen

2004

Aerosol Science and Technology

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“…Organic nitrate quantification was accomplished through use of a Brucker Tensor FT-IR spectrometer (Brucker, Inc.). FT-IR has been successfully employed in several previous laboratory and field studies for organic nitrate quantification (Laurent and Allen, 2004;Dekermenjian et al, 1999;Noda et al, 2000;Hallquist et al, 1999;Nielsen et al, 1998). Filter and denuder extracts were analyzed in a 1 cm liquid cell and organic nitrate concentrations were determined using the asymmetric -NO 2 stretch at ∼ 1640 cm −1 , unique to organic nitrates (Nielsen et al, 1995).…”

Section: Methodsmentioning

confidence: 99%

Determination of α-pinene-derived organic nitrate yields: particle phase partitioning and hydrolysis

Rindelaub¹,

McAvey²,

Shepson³

2014

Preprint

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Abstract. The hydroxyl radical oxidation of α-pinene under high NOx conditions was studied in a photochemical reaction chamber to investigate organic nitrate (RONO2) production and partitioning between the gas and particle phases. We report an organic nitrate yield of 26 ± 7% from the oxidation of this monoterpene in the presence of nitric oxide (NO). However, the organic nitrate yield was found to be highly dependent on both chamber relative humidity (RH) and seed aerosol acidity, likely as a result of particle phase hydrolysis. The particle phase loss of organic nitrates perturbs the gas-particle equilibrium within the system, leading to decreased RONO2 yields in both the gas and particle phases at elevated RH and an apparent non-equilibrium partitioning mechanism. This resulted in smaller apparent partition coefficients of the total organic nitrate species under high chamber RH. The hydrolysis of particle phase organic nitrates at low chamber relative humidity in this study implies that aerosol partitioning of organic nitrates may be an important sink for atmospheric NOx and may have a significant impact on regional air quality.

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“…This type of information is particularly helpful for developing an understanding of the properties, behavior and origins of the complex organic fraction of PM 2.5 . FTIR spectroscopy has been used to identify particle‐phase organics formed through atmospheric photochemical reactions (Dekermenjian et al., 1999a,b; Holes et al., 1997; Palen et al., 1993); to measure kinetic parameters in atmospheric aerosol surface reactions (Finlayson‐Pitts and Hemminger, 2000; Goodman et al., 1999); and to gain insights into the origin and polarity of organics in atmospheric particles (Allen et al., 1994; Blando et al., 1998; Mylonas et al., 1991; Pickle et al., 1990). FTIR spectroscopy has also provided compositional information related to the mutagenicity of ambient particles (Gundel et al., 1993).…”

Section: Introductionmentioning

confidence: 99%

Functional group characterization of indoor, outdoor, and personal PM2.5: results from RIOPA

et al. 2005

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To our knowledge this is the first time that FTIR spectroscopy has been used to characterize the composition of indoor and personal PM(2.5). The presence of sulfate, nitrate, ammonium, soil dust and a number of organic functional groups are all detected in one analysis on filter samples without extraction or other sample preparation. Differences between indoor and outdoor spectra are used to identify spectral features due to indoor-generated PM(2.5). Particularly interesting are the much larger aliphatic absorbances, shifts in carbonyl absorbances, and occasional small amide absorbances found in indoor and personal spectra but rarely in outdoor spectra. These observations are important because organics make up a large portion of PM(2.5) mass and their composition and properties are poorly characterized. The properties and behavior of organic compounds in airborne particles are often predicted based on their functional group composition. This analysis begins the development of a better understanding of the functional group composition of indoor and personal PM(2.5) and how it differs from that of outdoor PM(2.5). Eventually this will lead to an improved understanding of the properties, behavior and effects of PM(2.5) of indoor and outdoor origin.

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FTIR Analysis of Aerosol Formed in the Photooxidation of Naphthalene

Cited by 23 publications

References 14 publications

Size Distributions of Organic Functional Groups in Ambient Aerosol Collected in Houston, Texas Special Issue ofAerosol Science and Technologyon Findings from the Fine Particulate Matter Supersites Program

Size Distributions of Organic Functional Groups in Ambient Aerosol Collected in Houston, Texas Special Issue ofAerosol Science and Technologyon Findings from the Fine Particulate Matter Supersites Program

Determination of α-pinene-derived organic nitrate yields: particle phase partitioning and hydrolysis

Functional group characterization of indoor, outdoor, and personal PM2.5: results from RIOPA

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