New sample preparation for quantitative laser desorption mass spectrometry and optical spectroscopy

Haefliger, Olivier P.; Zenobi, Renato

doi:10.1063/1.1148849

Cited by 22 publications

(39 citation statements)

References 23 publications

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“…17 The same desorption experiment from rougher PVC filters returned n LOD = 0.5 fmol, which is consistent with our results and is claimed to be representative of most PAHs adsorbed on a carbon matrix. 17 3.3. Quantification of PAHs Adsorbed on Soot.…”

Section: Environmental Science and Technologysupporting

confidence: 91%

Progress toward the Quantitative Analysis of PAHs Adsorbed on Soot by Laser Desorption/Laser Ionization/Time-of-Flight Mass Spectrometry

Faccinetto

Focşa

Desgroux

et al. 2015

Environ. Sci. Technol.

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Ex situ analyses of substances extracted from flames provide useful albeit mostly qualitative information on the formation process of soot and on the impact of exhausts on the environment. An experimental setup based on the coupling of laser desorption, laser ionization and time-of-flight mass spectrometry (LD/LI/ToF-MS) is presented in past works as an alternative means to more traditional techniques like gas chromatography (GC) to characterize the polycyclic aromatic hydrocarbons (PAHs) content of soot. In this paper, we go one step further in the understanding of the laser desorption/laser ionization dynamics and propose a combined experimental/simulation approach: we estimate the limit of detection of LD/LI/ToF-MS as low as [0.2, 2.8] fmol per laser pulse and we make quantitative predictions on the concentration of PAHs desorbed from soot. In particular, external calibration with model samples where PAHs are adsorbed on black carbon at known concentrations allows us to link the concentration of PAHs desorbed and detected by photoionization ToF-MS to the concentration of PAHs adsorbed on soot. The comparison of data obtained from the analysis of flame sampled soot with standard commercial GC-MS run in parallel validates the approach and defines limits and potentialities of both techniques.

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Section: Environmental Science and Technologysupporting

confidence: 91%

Progress toward the Quantitative Analysis of PAHs Adsorbed on Soot by Laser Desorption/Laser Ionization/Time-of-Flight Mass Spectrometry

Faccinetto

Focşa

Desgroux

et al. 2015

Environ. Sci. Technol.

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“…The applications of surface techniques to the ex-situ analysis of soot are too many to describe herein, and range from thermal [65,66] to laser desorption mass spectrometry [67], possibly after solvent extraction [43] and on a variety of deposition substrates [27,44,68]. SIMS has been independently used for the analysis of the chemical composition of aerosols [69,70] and PAH containing samples [71], although it never was the technique of choice for systematic investigations of the chemical composition of soot particles.…”

Section: Preparation Of the Samples And Sims Measurementsmentioning

confidence: 99%

Unveiling trends in soot nucleation and growth: When secondary ion mass spectrometry meets statistical analysis

Irimiea

Faccinetto

Mercier

et al. 2019

Carbon

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At the present day, ultrafine soot particles have become the object of increasing attention due to their well-documented adverse effects on human health and climate. In particular, understanding soot nucleation is one of the most challenging problems toward a more controlled and cleaner combustion. Detailed information on the chemistry of nascent soot particles (NSPs) is expected to provide clues on the soot formation and growth reaction pathways. Herein, the early steps of soot formation in flames are addressed by investigating the chemical composition of NSPs and their molecular precursors by secondary ion mass spectrometry. The originality of this work lies on the combination of several factors that include: two different approaches to gain access to soot nucleation in premixed flames (analysis of a nucleation flame in which NSPs nucleate all along the reaction coordinate without growing in size) and in diffusion flames (separation of the precursors and soot regions); a sampling procedure that allows a rough separation of the condensable gas phase from soot particles; a large database of collected samples and high mass resolution that enable the use of an improved data reduction protocol based on hierarchical cluster analysis and principal component analysis for the data mining and interpretation.

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“…ass spectrometry is becoming a widely used method for the analysis of polymer and polymer derivatives based on its reproducibility [1,2], rapid analysis [3], and accurate mass measurement capabilities. In particular, Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry provides high mass resolution and mass accuracy which makes the technique well suited for many of the questions addressed in polymer analysis [4 -18].…”

mentioning

confidence: 99%

Isotope beating effects in the analysis of polymer distributions by Fourier transform mass spectrometry

Easterling

Amster

Rooij

et al. 1999

J. Am. Soc. Mass Spectrom.

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For Fourier transform mass spectrometry analysis of high mass ions, the signals from closely spaced isotope peaks undergo periodic destructive interference, producing a beat pattern in the time-domain signal. The mass spectra that are obtained by sampling transient signals for less than two beat periods exhibit an error in the relative abundances that are measured. This effect is shown to cause significant errors in the measurement of the relative abundances of the components of polymer distributions, leading to errors in the derived average molecular weights for such samples. Computer simulations show that isotope beating causes this error to increase as the duration of an acquired transient becomes short compared to the beating period. This error becomes insignificant when the transient is acquired for longer than twice the beat period. Experimental data are presented for polymers in which an oligomeric distribution of monoisotopic peaks is produced by stored waveform inverse Fourier transform ejection of all 13 C-containing isotope peaks. The data show that the isotope beating-induced abundance errors are eliminated when there are no isotope peaks present.

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New sample preparation for quantitative laser desorption mass spectrometry and optical spectroscopy

Cited by 22 publications

References 23 publications

Progress toward the Quantitative Analysis of PAHs Adsorbed on Soot by Laser Desorption/Laser Ionization/Time-of-Flight Mass Spectrometry

Progress toward the Quantitative Analysis of PAHs Adsorbed on Soot by Laser Desorption/Laser Ionization/Time-of-Flight Mass Spectrometry

Unveiling trends in soot nucleation and growth: When secondary ion mass spectrometry meets statistical analysis

Isotope beating effects in the analysis of polymer distributions by Fourier transform mass spectrometry

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