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Biochar determination in soils by applying pyrolysis GC-MS analysis and Black Carbon (BC) concentration trough dichromate and permanganate oxidation

AutorSuárez Abelenda, M.; Kaal, Joeri ; Knicker, Heike ; Camps Arbestain, M.; Macias, Felipe
Fecha de publicación2013
CitaciónGoldschmidt2013 Conference Abstracts. Biochar Interactions with Soil, Plant and Water – Processes and Fate, Florencia (Italia) pág. 2280 (2013)
ResumenDistinguishing pyrogenic and non-pyrogenic SOM components is a difficult task as non-selective pyrolysis products such as MAHs, PAHs and phenols can derive from multiple sources. However, black carbon (BC) may contribute significantly to the MAHs and PAHs in a given pyrolysate, especially if BC is more abundant than alternative sources. In this study, samples from a soil rich in pyrogenic material in NW Spain were subjected to K2Cr2O7 and KMnO4 oxidation and the residual SOM was NaOH-extracted and analyzed using analytical Py-GC-MS in order to study the susceptibility of different SOM fractions (fresh, degraded/microbial, aliphatic and specially BC) towards this oxidation agent. Besides solid-state 13C CP MAS-NMR was also performed to support theses results. Non-oxidized samples following the same NaOH-extraction procedure were also analyzed. From Py-GC-MS, residual SOM after K2Cr2O7 oxidation contained BC, N-containing BC (BN) and aliphatic structures whilst carbohydrate products and lignocellulose were completely oxidized. This was corroborated by a relatively intense resonance of aromatic C and some signal of alkyl C (supporting the presence of a non-pyrogenic fraction mainly consisting of aliphatic structures) in 13C NMR spectra. Thus K2Cr2O7 effectively concentrates MAHs, PAHs and BN derived from BC. For KMnO4, both techniques indicated that this reagent promotes the oxidation of carbohydrate products, mostly from degraded/microbial SOM but slightly oxidized lignocellulose and aromatic structures (pyrogenic and nonpyrogenic) not providing a good assessment of the BC signal.
DescripciónResumen de la Comunicación presentada en el Goldschmidt2013 Conference Abstracts. Biochar Interactions with Soil, Plant and Water – Processes and Fate, Florencia (Italia) 2013
Versión del editorhttp://goldschmidt.info/2013/abstracts/abstractView?abstractId=6020
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