Selective Detection of Dibenzodioxin, Dibenzofuran and Some Small Polycyclic Aromatics

Velazquez, J.; Voloboueva, L. A.; Cool, Terrill A.

doi:10.1080/00102209808924130

Cited by 21 publications

(9 citation statements)

References 42 publications

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“…On the other hand, aniline ( m / z = 93) was noticeably absent in the diesel generator exhaust. An upper value of the aniline concentration is determined to be 0.3 ppb, based on the similar ionization probability of aniline in comparison to benzene, being only a factor 1.67 lower . Note that this is not the REMPI-TOFMS instrument detection limit for aniline but rather the minimum concentration that would have been detectable in the diesel generator exhaust without significant ion signal overload on the detector at other masses.…”

Section: Resultsmentioning

confidence: 94%

“…The concentration of a target analyte is derived from the ratio between its ion signal intensity and that of the same analyte as present in the calibration gas mix, normalized for possible laser energy changes. Concentrations of those diesel generator exhaust analytes not present in the calibration mix were derived from the ionization probability ratios between benzene and such analytes as found by Cool and co-workers . In the case of concentration calibration of compounds that are in their crystalline form at room temperature, such as PAHs, a diffusion tube-based delivery system , was designed and applied to generate a known concentration of a specific analyte in the gas phase.…”

Section: Methodsmentioning

confidence: 99%

“…The resonance-enhanced multiphoton ionization time-of-flight mass spectrometry (REMPI-TOFMS) technique combined with a supersonic expansion has been developed over the past decade as an isomer-selective, sensitive, and real-time monitor of aromatic organic compounds. − It has been applied to complex waste streams from (pilot-scale) waste incinerators, , as well as a process monitor such as for coffee roasting . The application of REMPI-TOFMS to vehicle exhaust so far has been limited to studies on exhaust gas emissions from gasoline engines, − emphasizing the real-time and selective capabilities of REMPI-TOFMS without providing extensive emission factors.…”

mentioning

confidence: 99%

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Real-Time, On-Line Characterization of Diesel Generator Air Toxic Emissions by Resonance-Enhanced Multiphoton Ionization Time-of-Flight Mass Spectrometry

2004

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The laser-based resonance-enhanced multiphoton ionization time-of-flight mass spectrometry (REMPI-TOFMS) technique has been applied to the exhaust gas stream of a diesel generator to measure, in real time, concentration levels of aromatic air toxics. Volatile organic compounds, as well as several polycyclic aromatic hydrocarbons were detected in the concentration range of 10-200 ppb in the steady-state diesel generator exhaust. The results were verified and compared with conventional extractive sampling and analytical techniques using gas chromatography/mass spectrometry (GC/MS). The high isomer selectivity of the REMPI-TOFMS instrument provided data for individual xylene isomers that are otherwise (partially) coeluting in standard GC/MS analyses. Good agreement was observed between results for volatile and semivolatile organic compounds obtained with REMPI-TOFMS and conventional extractive sampling. Transient events, such as cold start-ups of the diesel generator, resulted in sharp (less than 15 s) peak emissions that were, for benzene, up to a factor of 90 higher than the predominately constant concentrations observed during steady-state operation; warm restarts resulted in lower peak concentrations by a factor of 2.5. These fast transient emissions are only detectable using a real-time approach (1-s resolution) as demonstrated here using REMPI-TOFMS.

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Section: Resultsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Real-Time, On-Line Characterization of Diesel Generator Air Toxic Emissions by Resonance-Enhanced Multiphoton Ionization Time-of-Flight Mass Spectrometry

2004

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“…For this purpose various strategies have been suggested including REMPI for selective ionization [16,18,19]. However, Haefliger and Zenobi demonstrated that single wavelength, two photon REMPI is not very selective for desorbed PAH because of the high temperature of the PAH gas [17].…”

Section: Evolution Of the Mass Spectra With The Ionization Fluence: Smentioning

confidence: 98%

Influence of the photoionization process on the fragmentation of laser desorbed polycyclic aromatic hydrocarbons

Thomson

Ziskind

Mihesan

et al. 2007

Applied Surface Science

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“…REMPI measurements of PAHs in a different environment were also performed by Cool and co-workers. 25 While most flames studied previously have burnt hydrocarbon fuels, we have recently started to investigate the fuel-rich flame chemistry of ethanol, ethanol being a simple prototype of an oxygenated fuel. Motivation for this study was the potential use of ethanol as an alternative non-fossil fuel 26 or as a fuel additive.…”

Section: Introductionmentioning

confidence: 99%

Contributions to the investigation of reaction pathways in fuel-rich flames

Kohse‐Höinghaus

Atakan

Lamprecht

et al. 2002

Phys. Chem. Chem. Phys.

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Development and validation of detailed reaction mechanisms for fuel-rich combustion have a continuing need for quantitative experimental flame data. In this study, an overview is presented of recent experimental investigations of a series of fuel-rich premixed low-pressure flames burning acetylene, propene, linear and cyclic C 5 -alkenes and C 5 -alkanes with a combination of laser spectroscopy and molecular beam mass spectrometry (MBMS). Particular attention was devoted to the reaction pathways leading to the first aromatic ring. Fuelspecific aspects with respect to benzene formation are discussed. The potential of resonance-enhanced multiphoton ionisation (REMPI) MBMS as a quantitative technique for the measurement of stable species is examined for benzene as an example. Also, first results of the investigation of a fuel-rich ethanol flame under similar conditions are given. Advantages and potential drawbacks of the applied diagnostic methods are discussed in view of the importance of reliable, quantitative measurements for the understanding of fuel-rich chemistry preceding polycyclic aromatic hydrocarbon (PAH) and soot formation as well as for the related modelling of these chemical processes.

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Selective Detection of Dibenzodioxin, Dibenzofuran and Some Small Polycyclic Aromatics

Cited by 21 publications

References 42 publications

Real-Time, On-Line Characterization of Diesel Generator Air Toxic Emissions by Resonance-Enhanced Multiphoton Ionization Time-of-Flight Mass Spectrometry

Real-Time, On-Line Characterization of Diesel Generator Air Toxic Emissions by Resonance-Enhanced Multiphoton Ionization Time-of-Flight Mass Spectrometry

Influence of the photoionization process on the fragmentation of laser desorbed polycyclic aromatic hydrocarbons

Contributions to the investigation of reaction pathways in fuel-rich flames

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