Amorphous and condensed organic matter domains: the effect of persulfate oxidation on the composition of soil/sediment organic matter

The composition of amorphous and condensed soil/sediment organic matter (SOM) domains was investigated for one soil sample and four sediment samples. These samples were oxidized with persulfate to remove amorphous SOM, before and after which the composition of SOM was studied by thermogravimetric an...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2002-09, Vol.48 (9), p.919-931
Main Authors: Cuypers, Chiel, Grotenhuis, Tim, Nierop, Klaas G.J., Franco, Elena Maneiro, de Jager, Adrie, Rulkens, Wim
Format: Article
Language:English
Subjects:
Carbon Isotopes - chemistry
CPMAS 13C-NMR
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Gas Chromatography-Mass Spectrometry
Geochemistry
Geologic Sediments - chemistry
Magnetic Resonance Spectroscopy
Organic Chemicals - analysis
Organic matter domains
Oxidation-Reduction
Pollution, environment geology
Pyrolysis
Soil
Soil and rock geochemistry
Soils
Surficial geology
TGA
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Summary:The composition of amorphous and condensed soil/sediment organic matter (SOM) domains was investigated for one soil sample and four sediment samples. These samples were oxidized with persulfate to remove amorphous SOM, before and after which the composition of SOM was studied by thermogravimetric analysis, pyrolysis-GC/MS, and cross polarization magic angle spinning 13C-NMR. Comparison of the SOM composition before and after oxidation showed that condensed SOM was more thermostable and less polar than amorphous SOM. Condensed SOM was relatively low in O–alkyl C and carboxyl C and it was likely to contain only small amounts of labile organic components (carbohydrates, peptides, fatty acids). Apart from these general characteristics, the composition of the condensed and amorphous domains appeared to be highly dependent on the origin and nature of the SOM investigated. Condensed domains in relatively undecomposed SOM were enriched in aliphatic C, whereas condensed domains in relatively weathered SOM were enriched in aromatic C. Altogether, the compositional changes upon persulfate oxidation were similar to the compositional changes upon humification, which supports the idea that weathered SOM is more condensed than the original material.
ISSN:0045-6535
1879-1298
DOI:10.1016/S0045-6535(02)00123-6