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Título: | Molecular characteristics of permanganate- and dichromate-oxidation-resistant soil organic matter from a black-C-rich colluvial soil |
Autor: | Suárez-Abelenda, M.; Kaal, Joeri CSIC ORCID ; Camps Arbestain, M.; Knicker, Heike CSIC ORCID ; Macías Vázquez, Felipe | Palabras clave: | Charcoal Py-GC/MS SOM oxidation |
Fecha de publicación: | 2014 | Editor: | CSIRO Publishing | Citación: | Soil Research 52(2): 164-179 (2014) | Resumen: | Samples from a colluvial soil rich in pyrogenic material (black C, BC) in north-west Spain were subjected to K2Cr2O7 and KMnO4 oxidation and the residual soil organic matter (SOM) was NaOH-extracted and analysed using analytical pyrolysis-gas chromatography-mass spectroscopy (Py-GC/MS) and solid-state 13C cross-polarisation magic angle spinning-nuclear magnetic resonance (13C CP MAS-NMR) in order to study the susceptibility of different SOM fractions (fresh, degraded/microbial, BC and aliphatic) towards these oxidising agents. Untreated samples that were NaOH-extracted were also analysed. The Py-GC/MS and 13C NMR indicated that KMnO4 promotes the oxidation of carbohydrate products, mostly from degraded/microbial SOM and lignocellulose, causing a relative enrichment of aliphatic and aromatic structures. Residual SOM after K2Cr2O7 oxidation contained BC, N-containing BC and aliphatic structures. This was corroborated by a relatively intense resonance of aromatic C and some signal of alkyl C in 13C NMR spectra. These results confirm that dichromate oxidation residues contain a non-pyrogenic fraction mainly consisting of aliphatic structures. | Descripción: | 16 páginas.-- 3 figuras.-- 3 tablas.-- 85 referencias | Versión del editor: | http://dx.doi.org/10.1071/SR13195 | URI: | http://hdl.handle.net/10261/95244 | DOI: | 10.1071/SR13195 | E-ISSN: | 1838-675X |
Aparece en las colecciones: | (IRNAS) Artículos (INCIPIT) Artículos |
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Molecular_characteristics_of.pdf | 1,62 MB | Adobe PDF | Visualizar/Abrir |
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