Sorption Selectivity in Natural Organic Matter Probed with Fully Deuterium-Exchanged and Carbonyl-13C-Labeled Benzophenone and 1H–13C NMR Spectroscopy

2014 ◽  
Vol 48 (15) ◽  
pp. 8645-8652 ◽  
Author(s):  
Xiaoyan Cao ◽  
Charisma Lattao ◽  
Joseph J. Pignatello ◽  
Jingdong Mao ◽  
Klaus Schmidt-Rohr
Keyword(s):  
Organic Matter ◽  
Nmr Spectroscopy ◽  
Natural Organic Matter ◽  
13C Nmr ◽  
13C Nmr Spectroscopy

Elemental Quantitation of Natural Organic Matter by CPMAS 13C NMR Spectroscopy

2002 ◽  
Vol 21 (3-4) ◽  
pp. 158-170 ◽  
Author(s):  
P. Conte ◽  
A. Piccolo ◽  
B. van Lagen ◽  
P. Buurman ◽  
M.A. Hemminga
Keyword(s):  
Organic Matter ◽  
Nmr Spectroscopy ◽  
Natural Organic Matter ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
Cpmas 13C Nmr

Soil nitrogen mineralisation and organic matter composition revealed by 13C NMR spectroscopy under repeated prescribed burning in eucalypt forests of south-east Queensland

Soil Research ◽  
1999 ◽  
Vol 37 (1) ◽  
pp. 123 ◽  
Author(s):  
D. F. Guinto ◽  
Z. H. Xu ◽  
P. G. Saffigna ◽  
A. P. N. House ◽  
M. C. S. Perera
Keyword(s):  
Organic Matter ◽  
Nmr Spectroscopy ◽  
13C Nmr ◽  
Prescribed Burning ◽  
13C Nmr Spectroscopy ◽  
High Ratio ◽  
N Mineralisation ◽  
Total N ◽  
Organic C ◽  
Organic Matter Composition

The effects of burning on in situ extractable nitrogen (NH+4-N+NO-3-N) and net Nmineralisation following scheduled fuel reduction burns in repeatedly burnt dry and wet sclerophyll forest sites in south-east Queensland were assessed. In addition, soil organic matter composition in the wet sclerophyll site was assessed by 13C NMR spectroscopy. The results showed that at the dry sclerophyll site, extractable N and net N mineralisation for 1 year were largely unaffected by burning, while at the wet sclerophyll site, these parameters decreased. 13C NMR analysis of soil samples from the wet sclerophyll site revealed that there was a significant reduction in the proportion of O-alkyl (alkoxy/carbohydrate) C with increasing burning frequency. Statistically significant effects on the other chemical shift regions were not detected. The ratio of alkyl C to O-alkyl C, a proposed index of organic matter decomposition, increased with increasing burning frequency. A high ratio of alkyl C to O-alkyl C suggests low amounts of carbohydrates relative to waxes and cutins, which could in turn lead to slower mineralisation. The findings are in accord with this hypothesis. There were significant linear relationships between cumulative N mineralisation for 1 year and the proportions of alkyl C and O-alkyl C, and the ratio of alkyl C/O-alkyl C. Thus, in addition to reductions in substrate quantity (low organic C and total N for burnt soils), there was also an alteration of substrate quality as revealed by 13C NMR spectroscopy which is reflected in low N mineralisation.

scholarly journals Adsorption of dissolved organic matter on clay minerals as assessed by infra-red, CPMAS 13C NMR spectroscopy and low field T1 NMR relaxometry

2011 ◽  
Vol 42 (8) ◽  
pp. 972-977 ◽  
Author(s):  
Pellegrino Conte ◽  
Cristina Abbate ◽  
Andrea Baglieri ◽  
Michéle Nègre ◽  
Claudio De Pasquale ◽  
...  
Keyword(s):  
Organic Matter ◽  
Nmr Spectroscopy ◽  
Dissolved Organic Matter ◽  
Clay Minerals ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
Low Field ◽  
Nmr Relaxometry ◽  
Infra Red ◽  
Cpmas 13C Nmr

Characterisation of humic acids, isolated from selected sub-antarctic soils by 13C-NMR spectroscopy

2017 ◽  
Vol 7 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Evgeny Abakumov
Keyword(s):  
Organic Matter ◽  
Nmr Spectroscopy ◽  
Humic Acids ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
Fildes Peninsula ◽  
Antarctic Soils ◽  
West Antarctic ◽  
The Antarctic

Soils of Antarctic considered as underestimated in terms of soils organic matter polls, organic remnants humification/mineralization rates and biogenic-abiogenic interactions. Humic acids of selected Sub Antarctic soils were investigated in terms of elemental and structural composition with special reference to evaluation of organic matter stabilisation degree and assessment of carbon species distributions in the molecules with use of solid state 13C-NMR spectroscopy. It was shown, that the prevailing of aliphatic compounds on the aromatic one is more pronounced in Antarctic soils than in Arctic ones. Average portion of the aromatic compounds is about 20% in humic acids, extracted from soils with evident ornitogenic effect from Fildes Peninsula (Norh-West Antarctic peninsula). This indicates that the role of humification precursors composition is the leading in the humification process. The stabilisation rate of the Antarctic HAs can be assessed as low and the potential risk of biodegradation of their molecules are high.

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