A new environmental chamber for evaluation of gas-phase chemical mechanisms and secondary aerosol formation

Carter, William; Cocker, David R.; Fitz, Dennis R.; Malkina, Irina L.; Bumiller, Kurt; Sauer, Claudia G.; Pisano, John T.; Bufalino, Charles; Song, Chen

doi:10.1016/j.atmosenv.2005.08.040

Cited by 202 publications

(226 citation statements)

References 35 publications

Supporting

Mentioning

207

Contrasting

Order By: Relevance

“…The very large size of such reactors enables low surface/volume (S/V) ratios, minimizing the effect of heterogeneous surface chemistry and chamber background effects. While EUPHORE, SAPHIR, and the UNC facilities are among the largest chambers in the world, teflon chambers that utilize artificial light sources have also been constructed and described in the literature (Carter et al, 2005;Thuener et al, 2004). However, teflon walls restrict chamber operation to ambient pressures and temperatures.…”

Section: R Glowacki Et Al: Hirac Design and Initial Resultsmentioning

confidence: 99%

“…However, in both of these applications, chambers suffer limitations because: (1) their instrumentation often necessitates investigating trace gas chemistry at concentrations higher than ambient, limiting the utility of the data and the range of conditions under which VOC oxidation mechanisms may be evaluated (Carter et al, 2005); and (2) background reactions that may affect the gas phase chemistry can be difficult to characterize, introducing uncertainty into the data (Carter et al, 2005;Dodge, 2000). Nevertheless, chambers are valuable tools for complementing and mediating between field campaigns and laboratory kinetics experiments.…”

Section: R Glowacki Et Al: Hirac Design and Initial Resultsmentioning

confidence: 99%

“…The NO 2 photolysis frequency is the product of the temperature and wavelength dependent absorption cross section, σ NO 2 (λ, T ), multiplied by its quantum yield, φ NO 2 (λ, T ), and the intensity of radiation at a particular wavelength and position with respect to a lamp, F (λ, x). σ NO 2 (λ, T ) and φ NO 2 (λ, T ) are well established (DeMore et al, 1997;Voigt et al, 2002), as is F (λ) for blacklamps (Carter et al, 2005(Carter et al, , 1995. Assuming that the wavelength dependence of the radiation passing through a small volume element located a distance x away from the lamp is independent of x, F (λ, x) may be written as F (λ)F (x), and the NO 2 photolysis frequency may be written as function of both temperature and distance from the lamp:…”

Section: Radiation Modelmentioning

confidence: 99%

See 2 more Smart Citations

Design of and initial results from a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC)

et al. 2007

View full text Add to dashboard Cite

Abstract. The design of a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC) is described and initial results obtained from HIRAC are presented. The ability of HIRAC to perform in-situ laser-induced fluorescence detection of OH and HO 2 radicals with the Fluorescence Assay by Gas Expansion (FAGE) technique establishes it as internationally unique for a chamber of its size and pressure/temperature variable capabilities. In addition to the FAGE technique, HIRAC features a suite of analytical instrumentation, including: a multipass FTIR system; a conventional gas chromatography (GC) instrument and a GC instrument for formaldehyde detection; NO/NO 2 , CO, O 3 , and H 2 O vapour analysers. Ray tracing simulations and NO 2 actinometry have been utilized to develop a detailed model of the radiation field within HIRAC. Comparisons between the analysers and the FTIR coupled to HIRAC have been performed, and HIRAC has also been used to investigate pressure dependent kinetics of the chlorine atom reaction with ethene and the reaction of O 3 and t-2-butene. The results obtained are in good agreement with literature recommendations and Master Chemical Mechanism predictions. HIRAC thereby offers a highly instrumented platform with the potential for: (1) high precision kinetics investigations over a range of atmospheric conditions; (2) detailed mechanism development, significantly enhanced according to its capability for measuring radicals; and (3) field instrument intercomparison, calibration, development, and investigations of instrument response at a range of atmospheric conditions.Correspondence to: P. W. Seakins

show abstract

Section: R Glowacki Et Al: Hirac Design and Initial Resultsmentioning

confidence: 99%

Section: R Glowacki Et Al: Hirac Design and Initial Resultsmentioning

confidence: 99%

Section: Radiation Modelmentioning

confidence: 99%

See 1 more Smart Citation

Design of and initial results from a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC)

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Table 1 shows the experimental conditions of this study. All experiments were conducted using the UCR CE-CERT 90-m 3 environmental chamber (Carter et al, 2005;Malloy et al, 2009;Qi et al, 2010). Two Teflon 90-m 3 reactors located in a 450-m 3 enclosure were ventilated by dry purified air (dew point less than 233 K).…”

Section: Methodsmentioning

confidence: 99%

Secondary organic aerosol formation from the photooxidation of isoprene, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene under high NO<sub>x</sub> conditions

et al. 2011

View full text Add to dashboard Cite

Abstract. Secondary organic aerosol (SOA) formation from atmospheric oxidation of isoprene has been the subject of multiple studies in recent years; however, reactions of other conjugated dienes emitted from anthropogenic sources remain poorly understood. SOA formation from the photooxidation of isoprene, isoprene-1-13 C, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene is investigated for high NO x conditions. The SOA yield measured in the 1,3-butadiene/NO x /H 2 O 2 irradiation system (0.089-0.178) was close to or slightly higher than that measured with isoprene under similar NO x conditions (0.077-0.103), suggesting that the photooxidation of 1,3-butadiene is a possible source of SOA in urban air. In contrast, a very small amount of SOA particles was produced in experiments with 2,3-dimethyl-1,3-butadiene. Off-line liquid chromatography -mass spectrometry analysis revealed that the signals of oligoesters comprise a major fraction (0.10-0.33) of the signals of the SOA products observed from all dienes investigated. The oligoesters originate from the unsaturated aldehyde gas phase diene reaction products; namely, semi-volatile compounds produced by the oxidation of the unsaturated aldehyde undergo particle-phase oligoester formation. Oligoesters produced by the dehydration reaction between nitrooxypolyol and 2-methylglyceric acid monomer or its oligomer were also characterized in these experiments with isoprene as the Correspondence to: D. R. Cocker III (dcocker@engr.ucr.edu) starting diene. These oligomers are possible sources of the 2-methyltetrols found in ambient aerosol samples collected under high NO x conditions. Furthermore, in low-temperature experiments also conducted in this study, the SOA yield measured with isoprene at 278 K was 2-3 times as high as that measured at 300 K under similar concentration conditions. Although oligomerization plays an important role in SOA formation from isoprene photooxidation, the observed temperature dependence of SOA yield is largely explained by gas/particle partitioning of semi-volatile compounds.

show abstract

“…The UCRiverside/CE-CERT Environmental Chamber has been described in detail elsewhere (Carter et al 2005). Briefly the facility consists of two 90 m 3 Teflon reactors located in a temperature controlled room, which is continuously flushed with purified air.…”

Section: Chamber Experimentsmentioning

confidence: 99%

Real-Time Aerosol Density Determination Utilizing a Modified Scanning Mobility Particle Sizer—Aerosol Particle Mass Analyzer System

Malloy¹,

Nakao²,

Li³

et al. 2009

Aerosol Science and Technology

118

View full text Add to dashboard Cite

Real time secondary organic aerosol (SOA) density evolution for m-xylene photo-oxidation and α-pinene ozonolysis was obtained using an Aerosol Particle Mass Analyzer (APM)/Scanning Mobility Particle Spectrometer (SMPS) setup, which has been modified to achieve higher transmission of particles and improved sampling frequency. The aerosol density of SOA generated from α-pinene ozonolysis was found to be 1.24 ± 0.03 g/cm 3 while the aerosol generated from m-xylene photo-oxidation was determined to be 1.35 ± 0.03 g/cm 3 . These results confirm the measurement approach from a combined SMPS and Aerodyne Aerosol Mass Spectrometer (AMS) system and are found to be within good agreement with the effective density measurements.

show abstract

A new environmental chamber for evaluation of gas-phase chemical mechanisms and secondary aerosol formation

Cited by 202 publications

References 35 publications

Design of and initial results from a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC)

Design of and initial results from a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC)

Secondary organic aerosol formation from the photooxidation of isoprene, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene under high NO<sub>x</sub> conditions

Real-Time Aerosol Density Determination Utilizing a Modified Scanning Mobility Particle Sizer—Aerosol Particle Mass Analyzer System

Contact Info

Product

Resources

About

A new environmental chamber for evaluation of gas-phase chemical mechanisms and secondary aerosol formation

Cited by 202 publications

References 35 publications

Design of and initial results from a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC)

Design of and initial results from a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC)

Secondary organic aerosol formation from the photooxidation of isoprene, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene under high NO&lt;sub&gt;x&lt;/sub&gt; conditions

Real-Time Aerosol Density Determination Utilizing a Modified Scanning Mobility Particle Sizer—Aerosol Particle Mass Analyzer System

Contact Info

Product

Resources

About

Secondary organic aerosol formation from the photooxidation of isoprene, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene under high NO<sub>x</sub> conditions