Rapid comprehensive characterization of crude oils by thermogravimetry coupled to fast modulated gas chromatography–single photon ionization time-of-flight mass spectrometry

Wohlfahrt, Sebastian; Fischer, M.; Saraji-Bozorgzad, Mohammad R.; Matuschek, G.; Streibel, Thorsten; Post, E.; Denner, Thomas; Zimmermann, Ralf

doi:10.1007/s00216-013-7029-4

Cited by 28 publications

(33 citation statements)

References 32 publications

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“…The usual transfer line temperature is below 300 °C which does not allow the transfer of low volatile compounds. The TA-capillary-MS coupling is generally applied for the investigation of organic compounds, often applying SPI to gain fingerprint mass spectra [10] [11] or with an additional GC step (TA-GC-MS) [12][13] for the better separation of highly complex matrices. A further disadvantage of the capillary coupling is that the evolving molecules often undergo decomposition or interactions take place in the capillary.…”

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confidence: 99%

An evolved gas analysis method for the characterization of sulfur vapor

Varga

Wohlfahrt

Fischer

et al. 2016

J Therm Anal Calorim

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In this study, thermal analysis coupled with soft ionization mass spectrometry was used for the speciation of sulfur vapor. Its investigation is still a challenge, since it exhibits a complex molecular composition. A thermal analysis-mass spectrometry system was equipped with a single photon ionization time-of-flight mass spectrometer (SPI-TOFMS). Single photon ionization is a soft ionization method which produces less or no fragments. Ionization is performed with vacuum ultraviolet (VUV) photons generated by an electron beam pumped excimer lamp (EBEL) and a deuterium lamp. The applicability of the developed system was demonstrated for the determination of sulfur vapor composition. Several allotropic modifications were detected in the gas phase depending on temperature. Since the ionization energies of the species are between 8.6 and 9.7 eV, soft ionization is crucial for this reason. Thermogravimetric and DSC data deliver additional information to the mass spectrometric data and enable the detection of allotropic transitions in solid and liquid phase.

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mentioning

confidence: 99%

An evolved gas analysis method for the characterization of sulfur vapor

Varga

Wohlfahrt

Fischer

et al. 2016

J Therm Anal Calorim

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“…By this route, the technique not only provides information on the amount of substance that is degraded, but also it can reveal its chemical type. For this purpose, there are a number of detectors that can be used, including mass spectrometry, Fourier transform spectroscopy or gas chromatography (GC) . The combination of TG with one of those detectors is generally called "evolved gas analysis" (EGA)…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, there are a number of detectors that can be used, including mass spectrometry, [1][2][3] Fourier transform spectroscopy [4][5][6] or gas chromatography (GC). 7 The combination of TG with one of those detectors is generally called "evolved gas analysis" (EGA). 8 Although an EGA system can offer a much greater amount of information, it is still difficult to collect real-time information on specific volatiles evolved from a sample.…”

Section: Introductionmentioning

confidence: 99%

Hyphenation of proton transfer reaction mass spectrometry with thermal analysis for monitoring the thermal degradation of retinyl acetate

Peinado

Mason

Biasioli

et al. 2017

Rapid Comm Mass Spectrometry

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Rationale: The processing of retinyl acetate, a vitamin and biomarker, at high temperatures causes significant decomposition of the compound and thus loss of its activity. The rate of mass loss can be conveniently studied by thermogravimetry (TG). However, this technique generally fails to reveal which compounds have evolved from the compound. In this work we propose a new hyphenation approach to continuously monitor the thermal decomposition of retinyl acetate and follow the evolution of specific volatile organic compounds (VOCs).Methods: Thermal degradation of retinyl acetate was followed by TG coupled to a direct injection mass spectrometer based on proton transfer reaction mass spectrometry (PTR-MS) to follow continuously the thermal decomposition of retinyl acetate. The results were also compared with those obtained by a second evolved gas analysis system based on the coupling of TG with Conclusions:The proposed TG-PTR-MS technique shows a great potential for following in real time the thermal degradation of ingredients such as retinyl acetate and identifying compounds evolved at specific temperatures.

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“…As reported, a 3 m column is a good compromise between separation power and retention time to allow all molecules to pass through the column during one isothermal cycle. 12,13 This was verified by test measurements.…”

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confidence: 98%

Optically Heated Ultra-Fast-Cycling Gas Chromatography Module for Separation of Direct Sampling and Online Monitoring Applications

et al. 2015

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This work describes an ultrafast-cycling gas chromatography module (fast-GC module) for direct-sampling gas chromatography/mass spectrometry (GC-MS). The sample can be introduced into the fast-GC module using a common GC injector or any GC × GC modulator. The new fast-GC module offers the possibility to conduct a complete temperature cycle within 30 s. Its thermal mass is minimized by using a specially developed home-built fused silica capillary column stack and a halogen lamp for heat generation, both placed inside a gold-coated quartz glass cylinder. A high airflow blower enables rapid cooling. The new device is highly flexible concerning the used separation column, the applied temperature program, and the integration into existing systems. An application of the fast-GC module is shown in this work by thermal analysis coupled to gas chromatography-mass spectrometry (TA-GC-MS). The continuously evolving gases of the TA are modulated by a liquid CO2 modulator. Because of the rapid cycling of the fast-GC module, it is possible to obtain the best separation while maintaining the online character of the TA. Restrictions in separation and retention time shifting, known from isothermal and normal ramped fast-GC systems, are overcome.

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Rapid comprehensive characterization of crude oils by thermogravimetry coupled to fast modulated gas chromatography–single photon ionization time-of-flight mass spectrometry

Cited by 28 publications

References 32 publications

An evolved gas analysis method for the characterization of sulfur vapor

An evolved gas analysis method for the characterization of sulfur vapor

Hyphenation of proton transfer reaction mass spectrometry with thermal analysis for monitoring the thermal degradation of retinyl acetate

Optically Heated Ultra-Fast-Cycling Gas Chromatography Module for Separation of Direct Sampling and Online Monitoring Applications

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