scholarly journals Degradation of mangrove tissues by arboreal termites ( Nasutitermes acajutlae ) and their role in the mangrove C cycle (Puerto Rico): Chemical characterization and organic matter provenance using bulk δ 13 C, C/N, alkaline CuO oxidation‐GC/MS, and solid‐state 13 C NMR

2013 ◽  
Vol 14 (8) ◽  
pp. 3176-3191 ◽  
Author(s):  
Christopher H. Vane ◽  
Alexander W. Kim ◽  
Vicky Moss‐Hayes ◽  
Colin E. Snape ◽  
Miguel Castro Diaz ◽  
...  
Keyword(s):  
Organic Matter ◽  
Puerto Rico ◽  
Solid State ◽  
Chemical Characterization ◽  
C Cycle ◽  
C Nmr ◽  
Cuo Oxidation

The in situ analysis of organic matter in soils

2001 ◽  
Vol 81 (3) ◽  
pp. 249-254 ◽  
Author(s):  
Morris Schnitzer
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Solid State ◽  
In Situ Analysis ◽  
Ionization Mass Spectrometry ◽  
Field Ionization ◽  
Ionization Mass ◽  
Chemical Structures ◽  
C Nmr

Traditionally, studies on soil organic matter (SOM) begin with the extraction of SOM from soils, its fractionation into humic acid, fulvic acid, and humin, followed by de-ashing of each fraction. These are tedious, laborious and inefficient procedures that do not provide any chemical information on these materials. Instead, recently developed methods such as solid-state 13C NMR and pyrolysis – field ionization mass spectrometry (Py-FIMS) can now be used for the in situ analysis of SOM in soils. These methods identify the major chemical components of SOM without extractions and fractionations, and yield valuable information on the main chemical structures in these materials. A better knowledge of the structural chemistry of SOM will help SOM chemists and other soil scientists to better understand the complex chemical and biochemical reactions that occur in soils, and will enable them to develop practices that will improve soil management and soil productivity. Key words: Extraction, fractionation, solid state 13C NMR, pyrolysis-field ionization mass spectrometry, chemical composition

ATTEMPTS TO IMPROVE SOLID STATE 13C NMR SPECTRA OF WHOLE MINERAL SOILS

1988 ◽  
Vol 68 (3) ◽  
pp. 593-602 ◽  
Author(s):  
M. A. ARSHAD ◽  
J. A. RIPMEESTER ◽  
M. SCHNITZER
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Solid State ◽  
Nmr Spectra ◽  
Important Indicator ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Mineral Soils ◽  
C Nmr

This study describes a number of different preparation techniques for recording solid state 13C NMR spectra of whole mineral soils. Removal of paramagnetic Fe3+ improves the quality of 13C NMR spectra of whole soils and of particle size fractions. The C:Fe ratio appears to be an important indicator for obtaining satisfactory 13C NMR spectra of whole soils and fractions separated from them. If the C:Fe ratio is >> 1, the quality of the spectrum will be good; if the ratio is > 1, a reasonable spectrum will be obtained, but if the ratio is < 1, the spectrum will be poor. Organic-matter-rich soil and particle size fractions separated by a flotation technique produce well-defined 13C NMR spectra, typical of humic materials. Reduction of C-enriched fractions with sodium dithionite and stannous chloride improves the spectral resolution. The data presented herein show that satisfactory solid state 13C NMR spectra can be run on untreated soil particle size fractions, non-magnetic portions of whole soils, and fractions enriched in soil organic matter by flotation, especially after chemical reduction. Key words: 13C NMR spectroscopy, paramagnetic mineral separation

scholarly journals Structure Evolution of Organic Compounds in Shale Plays by Spectroscopy (1H & 13C−NMR, XPS, and FTIR) Analysis

2020 ◽  
Author(s):  
Hyeonseok Lee ◽  
Nuri Oncel ◽  
Mohammadreza Shokouhimehr ◽  
Mehdi Ostadhassan ◽  
Bo Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Fourier Transform ◽  
Solid State ◽  
Photoelectron Spectroscopy ◽  
Chemical Structure ◽  
Structure Evolution ◽  
Ftir Analysis ◽  
X Ray ◽  
Amorphous Organic Matter ◽  
C Nmr

Amorphous organic matter in geomaterials also known as kerogen undergoes significant alteration in chemical structure during thermal maturation which is characterized using a combination of solid−state <sup>1</sup>H & <sup>13</sup>C−NMR, X−ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) techniques.

scholarly journals Structure Evolution of Organic Compounds in Shale Plays by Spectroscopy (1H & 13C−NMR, XPS, and FTIR) Analysis

2019 ◽  
Author(s):  
Hyeonseok Lee ◽  
Nuri Oncel ◽  
Mohammadreza Shokouhimehr ◽  
Mehdi Ostadhassan
Keyword(s):  
Organic Matter ◽  
Fourier Transform ◽  
Solid State ◽  
Photoelectron Spectroscopy ◽  
Chemical Structure ◽  
Structure Evolution ◽  
Ftir Analysis ◽  
X Ray ◽  
Amorphous Organic Matter ◽  
C Nmr

Amorphous organic matter in geomaterials also known as kerogen undergoes significant alteration in chemical structure during thermal maturation which is characterized using a combination of solid−state <sup>1</sup>H & <sup>13</sup>C−NMR, X−ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) techniques.

scholarly journals Structure Evolution of Organic Compounds in Shale Plays by Spectroscopy (1H & 13C−NMR, XPS, and FTIR) Analysis

2020 ◽  
Author(s):  
Hyeonseok Lee ◽  
Nuri Oncel ◽  
Mohammadreza Shokouhimehr ◽  
Mehdi Ostadhassan ◽  
Bo Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Fourier Transform ◽  
Solid State ◽  
Photoelectron Spectroscopy ◽  
Chemical Structure ◽  
Structure Evolution ◽  
Ftir Analysis ◽  
X Ray ◽  
Amorphous Organic Matter ◽  
C Nmr

Amorphous organic matter in geomaterials also known as kerogen undergoes significant alteration in chemical structure during thermal maturation which is characterized using a combination of solid−state <sup>1</sup>H & <sup>13</sup>C−NMR, X−ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) techniques.

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