Molecular characteristics of permanganate- and dichromate-oxidation-resistant soil organic matter from a black-C-rich colluvial soil
Manuel Suárez-Abelenda A E , Joeri Kaal B , Marta Camps-Arbestain C , Heike Knicker D and Felipe Macías A
+ Author Affiliations
- Author Affiliations
A Departamento de Edafoloxía e Química Agrícola, Facultade de Bioloxía, Universidade de Santiago de Compostela, 15782- Santiago de Compostela, Spain.
B Instituto de Ciencias del Patrimonio (Incipit), Consejo Superior de Investigaciones Científicas (CSIC), Rúa San Roque 2, 15704 Santiago de Compostela, Spain.
C Institute of Natural Resources, Private Bag 11222, Massey University, Palmerston North 4442, New Zealand.
D Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC), Adva. Reina Mercedes 10, 41012 Sevilla, Spain.
E Corresponding author. Email: manuel.suarez@usc.es
Soil Research 52(2) 164-179 https://doi.org/10.1071/SR13195
Submitted: 5 July 2013 Accepted: 3 October 2013 Published: 6 March 2014
Abstract
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.
Additional keywords: K2Cr2O7, KMnO4, SOM oxidation, charcoal, Py-GC/MS, 13C NMR.
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