Coupling of thermal analysis with quadrupole mass spectrometry and isotope ratio mass spectrometry for simultaneous determination of evolved gases and their carbon isotopic composition

López-Capél, Elisa; Abbott, Geoffrey D.; Thomas, K. Mark; Manning, David

doi:10.1016/j.jaap.2005.04.004

Cited by 63 publications

(50 citation statements)

References 34 publications

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“…At a high HRT, complex materials are degraded and transformation and/or accumulation into condensate organic and nitrogen forms are the result of the stabilization process. In this sense results obtained by Lopez-Capel et al (2006) reporting an increase in the emission of NO and CO 2 species at 530°C are in agreement with those obtained in the present study, although the prolonged retention time inside the digester (sample SWH-50) allowed the partial degradation of these materials. Calvo et al (2004) in the study of sludge samples from a mesophilic digestion process, performed TG-MS analysis under atmospheres with varying oxygen content, reporting NO 2 emissions centred around 300-400°C under complete oxidizing conditions which may be indicative of the lack of aromatic structures containing nitrogen.…”

Section: Mass-spectrometry Analysissupporting

confidence: 93%

Anaerobic digestion of solid slaughterhouse waste: study of biological stabilization by Fourier Transform infrared spectroscopy and thermogravimetry combined with mass spectrometry

et al. 2009

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In this paper, Fourier Transform infrared spectroscopy (FTIR) along with thermogravimetric analysis together with mass spectrometry (TG-MS analysis) were employed to study the organic matter transformation attained under anaerobic digestion of slaughterhouse waste and to establish the stability of the digestates obtained when compared with fresh wastes. Digestate samples studied were obtained from successful digestion and failed systems treating slaughterhouse waste and the organic fraction of municipal solid wastes. The FTIR spectra and TG profiles from well stabilized products (from successful digestion systems) showed an increase in the aromaticity degree and the reduction of volatile content and aliphatic structures as stabilization proceeded. On the other hand, the FTIR spectra of non-stable reactors showed a high aliphaticity degree and fat content. When comparing differential thermogravimetry (DTG) profiles of the feed and digestate samples obtained from all successful anaerobic systems, a reduction in the intensity of the low-temperature range (approximately 300 degrees C) peak was observed, while the weight loss experienced at high-temperature (450-550 degrees C) was variable for the different systems. Compared to the original waste, the intensity of the weight loss peak in the high-temperature range decreased in the reactors with higher hydraulic retention time (HRT) whereas its intensity increased and the peak was displaced to higher temperatures for the digesters with lower HRT.

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Section: Mass-spectrometry Analysissupporting

confidence: 93%

Anaerobic digestion of solid slaughterhouse waste: study of biological stabilization by Fourier Transform infrared spectroscopy and thermogravimetry combined with mass spectrometry

et al. 2009

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“…Other applications have involved direct instrument coupling and stable isotope analysis of the evolved gas (e.g. Lopez-Capel et al 2006;Manning et al 2008). …”

Section: Introductionmentioning

confidence: 99%

Distribution of Radiocarbon Ages in Soil Organic Matter by Thermal Fractionation

Plante

Beaupré²,

Roberts³

et al. 2013

Radiocarbon

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ABSTRACT. Radiocarbon analysis is an important tool in quantifying soil organic matter (SOM) dynamics within the terrestrial carbon cycle. However, there is increasing appreciation that representing SOM as a single, homogeneous pool with a single, mean 14 C concentration is inadequate. We investigate whether the differing patterns in CO 2 release during rampedtemperature oxidation reflect organic matter of different ages, and hypothesize that thermally labile SOM (combusting at low temperatures) consists of younger carbon than thermally resistant organic matter. Topsoil samples under contrasting land uses (native vegetation and long-term cultivation) were selected for 14 C analysis before and after acid fumigation for the removal of carbonates. Results of bulk 14 C analyses showed a significant shift in 14 C age from 0.944 Fm under native vegetation to 0.790 Fm under cultivation. Four to 5 "fractions" associated with different CO 2 -evolution regions were identified by thermal analysis and analyzed for 14 C via modifications to NOSAMS' established "programmed temperature pyrolysis system," in which discrete CO 2 fractions evolved during ramped-temperature oxidation were isotopically characterized by a microwave gas ion source (GIS) continuous-flow AMS (CFAMS) system. Results showed that while acid fumigation removed soil carbonates, the treatment also significantly altered the thermograms and inferred SOM composition. While direct attribution of 14 C values to individual peaks is somewhat confounded by overlapping temperature ranges for oxidation of unique populations of carbon, in general, thermally stable fractions of SOM appear to be 14 C-depleted compared to thermally reactive (low temperature) fractions regardless of pretreatment.

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“…In most cases it is impossible to directly or simultaneously observe the visual changes taking place in the studied materials. Currently, in modern test equipment it is common to include the so-called coupled methods (allowing to perform several independent measurements at the same time, e.g., the measurement cycle in differential scanning calorimetry/thermogravimetry/quadrupole mass spectrometry; DSC/TG/QMS), which facilitate interpretation of the registered thermal effects, mass changes or released gas products [1][2][3][4][5][6][7][8][9]. From the results it can be concluded which phenomena are being dealt with, but observation of the sample can be conducted only before and/or after the experiment.…”

Section: Introductionmentioning

confidence: 99%

Application of a device used for observation of controlled thermal processes in a furnace

Hebda

Laska

Szechyńska‐Hebda

2013

J Therm Anal Calorim

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This paper describes an appliance that allows to visually observe phenomena occurring in the studied materials during heating, from room temperature to 600°C. The design criteria and device construction are described in details. The device allows for visual observation of physical phenomena of various material types, e.g., organic matter, polymers, and even observation of sintering mechanisms. Analysis of lubricant evaporation from powder metals (an aluminum alloy) in different atmospheres is shown. The featured device can also be used for interpretation of material defects. This is presented on the example of heating the aluminum alloy in an atmosphere containing oxygen (to simulate a furnace leakage). In addition, the influence of experimental atmosphere on melting and sintering processes is demonstrated. Another application of the presented device can be the visual observation of differences between combustion and pyrolysis processes. Our results show that the presented device is complementary with an advanced thermoanalysis apparatus which, in turn, does not allow visual observation of samples.

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Coupling of thermal analysis with quadrupole mass spectrometry and isotope ratio mass spectrometry for simultaneous determination of evolved gases and their carbon isotopic composition

Cited by 63 publications

References 34 publications

Anaerobic digestion of solid slaughterhouse waste: study of biological stabilization by Fourier Transform infrared spectroscopy and thermogravimetry combined with mass spectrometry

Anaerobic digestion of solid slaughterhouse waste: study of biological stabilization by Fourier Transform infrared spectroscopy and thermogravimetry combined with mass spectrometry

Distribution of Radiocarbon Ages in Soil Organic Matter by Thermal Fractionation

Application of a device used for observation of controlled thermal processes in a furnace

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