Effect of multivalent cations, temperature, and aging on SOM thermal properties

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Dörte Diehl
  • Jette Schwarz
  • Marc O. Goebel
  • Susanne K. Woche
  • Tatjana Schneckenburger
  • Jaane Krüger
  • Anastasia Shchegolikhina
  • Bernd Marschner
  • Friederike Lang
  • Sören Thiele-Bruhn
  • Jörg Bachmann
  • Gabriele E. Schaumann

External Research Organisations

  • University of Koblenz-Landau
  • Trier University
  • University of Freiburg
  • Ruhr-Universität Bochum
  • Tomsk Polytechnic University
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Details

Original languageEnglish
Pages (from-to)1203-1213
Number of pages11
JournalJournal of Thermal Analysis and Calorimetry
Volume118
Issue number2
Publication statusPublished - 30 Jul 2014

Abstract

Multivalent cations are suggested to influence the supramolecular structure of soil organic matter (SOM) via inter- and intra-molecular interactions with SOM functional groups. In this study, we tested the combined effect of cations, temperature treatment, and isothermal aging on SOM matrix properties. Samples from a peat and a mineral soil were either enriched with Na, Ca, and Al or desalinated in batch experiments. After treatment at 25, 40, 60, and 105 °C and after different periods of aging at 19 °C and 31 % relative humidity, we investigated the physicochemical matrix stability and the thermal stability against combustion. We hypothesized that multivalent cations stabilize the SOM matrix, that these structures disrupt at elevated temperatures, and that aging leads to an increase in matrix stability. The results show that cation-specific effects on matrix rigidity started to evolve in the peat only after 8 weeks of aging and were significantly lower than the temperature effects. Temperature treatment above 40 °C caused a non (or not immediately) reversible loss of water molecule bridges (WaMB) and above 60 °C a partly reversible melting process probably of semi-crystalline poly(methylene). Thermal stability increased with increasing cation valence and degree of protonation and was much less affected by temperature. Generally, Na-treated and control samples revealed lower thermal stability and lower increase in matrix rigidity with aging than those treated with Ca, Al, and H. We conclude that drying at elevated temperatures (>40 °C) may irreversibly change SOM structure via disruption of labile cross-links and melting of semi-crystalline domains.

Keywords

    Cation, Combustion enthalpy, Differential scanning calorimetry (DSC), Soil organic matter (SOM), Step transition

ASJC Scopus subject areas

Cite this

Effect of multivalent cations, temperature, and aging on SOM thermal properties. / Diehl, Dörte; Schwarz, Jette; Goebel, Marc O. et al.
In: Journal of Thermal Analysis and Calorimetry, Vol. 118, No. 2, 30.07.2014, p. 1203-1213.

Research output: Contribution to journalArticleResearchpeer review

Diehl, D, Schwarz, J, Goebel, MO, Woche, SK, Schneckenburger, T, Krüger, J, Shchegolikhina, A, Marschner, B, Lang, F, Thiele-Bruhn, S, Bachmann, J & Schaumann, GE 2014, 'Effect of multivalent cations, temperature, and aging on SOM thermal properties', Journal of Thermal Analysis and Calorimetry, vol. 118, no. 2, pp. 1203-1213. https://doi.org/10.1007/s10973-014-3989-7
Diehl, D., Schwarz, J., Goebel, M. O., Woche, S. K., Schneckenburger, T., Krüger, J., Shchegolikhina, A., Marschner, B., Lang, F., Thiele-Bruhn, S., Bachmann, J., & Schaumann, G. E. (2014). Effect of multivalent cations, temperature, and aging on SOM thermal properties. Journal of Thermal Analysis and Calorimetry, 118(2), 1203-1213. https://doi.org/10.1007/s10973-014-3989-7
Diehl D, Schwarz J, Goebel MO, Woche SK, Schneckenburger T, Krüger J et al. Effect of multivalent cations, temperature, and aging on SOM thermal properties. Journal of Thermal Analysis and Calorimetry. 2014 Jul 30;118(2):1203-1213. doi: 10.1007/s10973-014-3989-7
Diehl, Dörte ; Schwarz, Jette ; Goebel, Marc O. et al. / Effect of multivalent cations, temperature, and aging on SOM thermal properties. In: Journal of Thermal Analysis and Calorimetry. 2014 ; Vol. 118, No. 2. pp. 1203-1213.
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abstract = "Multivalent cations are suggested to influence the supramolecular structure of soil organic matter (SOM) via inter- and intra-molecular interactions with SOM functional groups. In this study, we tested the combined effect of cations, temperature treatment, and isothermal aging on SOM matrix properties. Samples from a peat and a mineral soil were either enriched with Na, Ca, and Al or desalinated in batch experiments. After treatment at 25, 40, 60, and 105 °C and after different periods of aging at 19 °C and 31 % relative humidity, we investigated the physicochemical matrix stability and the thermal stability against combustion. We hypothesized that multivalent cations stabilize the SOM matrix, that these structures disrupt at elevated temperatures, and that aging leads to an increase in matrix stability. The results show that cation-specific effects on matrix rigidity started to evolve in the peat only after 8 weeks of aging and were significantly lower than the temperature effects. Temperature treatment above 40 °C caused a non (or not immediately) reversible loss of water molecule bridges (WaMB) and above 60 °C a partly reversible melting process probably of semi-crystalline poly(methylene). Thermal stability increased with increasing cation valence and degree of protonation and was much less affected by temperature. Generally, Na-treated and control samples revealed lower thermal stability and lower increase in matrix rigidity with aging than those treated with Ca, Al, and H. We conclude that drying at elevated temperatures (>40 °C) may irreversibly change SOM structure via disruption of labile cross-links and melting of semi-crystalline domains.",
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T1 - Effect of multivalent cations, temperature, and aging on SOM thermal properties

AU - Diehl, Dörte

AU - Schwarz, Jette

AU - Goebel, Marc O.

AU - Woche, Susanne K.

AU - Schneckenburger, Tatjana

AU - Krüger, Jaane

AU - Shchegolikhina, Anastasia

AU - Marschner, Bernd

AU - Lang, Friederike

AU - Thiele-Bruhn, Sören

AU - Bachmann, Jörg

AU - Schaumann, Gabriele E.

N1 - Funding Information: Acknowledgements The presented study was supported by the German Research Foundation (Deutsche Forschungsgemeinschaft) within the priority program SPP 1315 ‘‘Biogeochemical Interfaces in Soil’’ projects SCHA849/8, BA1359/9, KA1139/15, TH678/10, and LA1398/7-2 and the CROSSLINK project (SCHA849/6-1). Publisher Copyright: © 2014 Akadémiai Kiadó, Budapest, Hungary. Copyright: Copyright 2015 Elsevier B.V., All rights reserved.

PY - 2014/7/30

Y1 - 2014/7/30

N2 - Multivalent cations are suggested to influence the supramolecular structure of soil organic matter (SOM) via inter- and intra-molecular interactions with SOM functional groups. In this study, we tested the combined effect of cations, temperature treatment, and isothermal aging on SOM matrix properties. Samples from a peat and a mineral soil were either enriched with Na, Ca, and Al or desalinated in batch experiments. After treatment at 25, 40, 60, and 105 °C and after different periods of aging at 19 °C and 31 % relative humidity, we investigated the physicochemical matrix stability and the thermal stability against combustion. We hypothesized that multivalent cations stabilize the SOM matrix, that these structures disrupt at elevated temperatures, and that aging leads to an increase in matrix stability. The results show that cation-specific effects on matrix rigidity started to evolve in the peat only after 8 weeks of aging and were significantly lower than the temperature effects. Temperature treatment above 40 °C caused a non (or not immediately) reversible loss of water molecule bridges (WaMB) and above 60 °C a partly reversible melting process probably of semi-crystalline poly(methylene). Thermal stability increased with increasing cation valence and degree of protonation and was much less affected by temperature. Generally, Na-treated and control samples revealed lower thermal stability and lower increase in matrix rigidity with aging than those treated with Ca, Al, and H. We conclude that drying at elevated temperatures (>40 °C) may irreversibly change SOM structure via disruption of labile cross-links and melting of semi-crystalline domains.

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