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Wiedemeier, Daniel B. ; Abiven, Samuel ; Hockaday, William C. ; Keiluweit, Marco ; Kleber, Markus ; Masiello, Caroline A. ; McBeath, Anna V. ; Nico, Peter S. ; Pyle, Lacey A. ; Schneider, Maximilian P. W. ; Smernik, Ronald J. ; Wiesenberg, Guido L. B. ; Schmidt, Michael W. I.:
Aromaticity and degree of aromatic condensation of char.
In: Organic Geochemistry.
Bd. 78
(2015)
.
- S. 135-143.
ISSN 1873-5290
DOI: https://doi.org/10.1016/j.orggeochem.2014.10.002
Abstract
The aromatic carbon structure is a defining property of chars and is often expressed with the help of two concepts: (i) aromaticity and (ii) degree of aromatic condensation. The varying extent of these two features is assumed to largely determine the relatively high persistence of charred material in the environment and is thus of interest for, e.g., biochar characterization or carbon cycle studies. Consequently, a variety of methods has been used to assess the aromatic structure of chars, which has led to interesting insights but has complicated the comparison of data acquired with different methods. We therefore used a suite of seven methods (elemental analysis, MIR spectroscopy, NEXAFS spectroscopy, 13C NMR spectroscopy, BPCA analysis, lipid analysis and helium pycnometry) and compared 13 measurements from them using a diverse sample set of 38 laboratory chars. Our results demonstrate that most of the measurements could be categorized either into those which assess aromaticity or those which assess the degree of aromatic condensation. A variety of measurements, including relatively inexpensive and simple ones, reproducibly captured the two aromatic features in question, and data from different methods could therefore be compared. Moreover, general patterns between the two aromatic features and the pyrolysis conditions were revealed, supporting reconstruction of the highest heat treatment temperature (HTT) of char.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | Pyrogenic organic matter; Char; Aromaticity; Aromatic condensation; Pyrolysis; Stability; Heat treatment temperature; Biochar |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften |
| Eingestellt am: | 31 Okt 2024 10:03 |
| Letzte Änderung: | 31 Okt 2024 10:03 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/90926 |