Characterization of soil organic matter with different degrees of humification using evolved gas analysis-mass spectrometry

Naoya Katsumi, Koyo Yonebayashi, Masanori Okazaki, Shun Nishiyama, Tomoe Nishi, Akihiko Hosaka, Chuichi Watanabe

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    Evolved gas analysis-mass spectrometry (EGA-MS) provides a direct connection between the pyrolyzer and mass spectrometer through a deactivated capillary tube, and provides both a thermal profile relating to the differential thermogravimetric curve of the sample and a mass spectrum of evolved gas from the sample. In this study, EGA-MS was performed to obtain thermal profiles and identify the pyrolysis products of 12 humic acids (HAs) with different degrees of humification extracted from 5 Andisols, 3 Entisols, and 3 Inceptisols, as well as soil samples. All HAs were thermally decomposed gradually over a wide temperature range (100-700°C), and the EGA curves showed four peaks and shoulders at around 250, 350, 450, and 550°C. The peaks at around 550°C were observed for the Andisol HAs only. Carboxyl groups, carbohydrates, and short chain alkanes and alkenes of the HAs and bulk soil samples evolved at a relatively low-temperature region (200-300°C). On the other hand, aromatics including benzenes and lignin derivatives evolved at a relatively high-temperature region (300-600°C). While the shapes of the EGA curves were different between the soils and extracted HAs, the major components of the evolved gas and the pyrolysis behavior of the constituents in the HAs and soil samples were similar. The amount of evolved gas from the Andisol HAs, which mainly consisted of CO2, was very low in comparison to that from the Entisol and Inceptisol HAs. The amount of evolved gas and the molecular weight of the pyrolysis products decreased as humification progressed, but the proportion of CO2 in the total area of the EGA curves increased. The results demonstrated that humification reduces the proportion of volatile components and increases the amount of carboxyl groups. As a result, the molecular structure of HAs is found to be mainly composed of non-volatile components and carboxyl groups. Since EGA-MS can provide information about the chemical structure and pyrolysis characteristics of a small sample without pretreatment, it is a useful tool for soil organic matter research.

    Original languageEnglish
    Pages (from-to)28-37
    Number of pages10
    JournalTalanta
    Volume155
    DOIs
    Publication statusPublished - 2016 Aug 1

    Fingerprint

    Humic Substances
    Gas fuel analysis
    Biological materials
    Mass spectrometry
    Mass Spectrometry
    Soil
    Gases
    Soils
    Pyrolysis
    Temperature
    Hot Temperature
    Benzene Derivatives
    Capillary tubes
    Alkanes
    Lignin
    Alkenes
    Mass spectrometers
    Benzene
    Molecular Structure
    Molecular structure

    Keywords

    • Evolved gas analysis-mass spectrometry
    • Humic acids
    • Soil organic matter

    ASJC Scopus subject areas

    • Chemistry(all)

    Cite this

    Katsumi, N., Yonebayashi, K., Okazaki, M., Nishiyama, S., Nishi, T., Hosaka, A., & Watanabe, C. (2016). Characterization of soil organic matter with different degrees of humification using evolved gas analysis-mass spectrometry. Talanta, 155, 28-37. https://doi.org/10.1016/j.talanta.2016.04.007

    Characterization of soil organic matter with different degrees of humification using evolved gas analysis-mass spectrometry. / Katsumi, Naoya; Yonebayashi, Koyo; Okazaki, Masanori; Nishiyama, Shun; Nishi, Tomoe; Hosaka, Akihiko; Watanabe, Chuichi.

    In: Talanta, Vol. 155, 01.08.2016, p. 28-37.

    Research output: Contribution to journalArticle

    Katsumi, N, Yonebayashi, K, Okazaki, M, Nishiyama, S, Nishi, T, Hosaka, A & Watanabe, C 2016, 'Characterization of soil organic matter with different degrees of humification using evolved gas analysis-mass spectrometry', Talanta, vol. 155, pp. 28-37. https://doi.org/10.1016/j.talanta.2016.04.007
    Katsumi, Naoya ; Yonebayashi, Koyo ; Okazaki, Masanori ; Nishiyama, Shun ; Nishi, Tomoe ; Hosaka, Akihiko ; Watanabe, Chuichi. / Characterization of soil organic matter with different degrees of humification using evolved gas analysis-mass spectrometry. In: Talanta. 2016 ; Vol. 155. pp. 28-37.
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