scholarly journals Mineral and Organic Matter Characterization of Density Fractions of Basalt- and Granite-Derived Soils in Montane California

10.5772/36735 ◽  
2012 ◽  
Author(s):  
C. Castanha ◽  
S.E. Trumbore ◽  
R. Amundso
Keyword(s):  
Organic Matter ◽  
Density Fractions

scholarly journals Characterization of Soil Organic Matter in Aggregates and Size-Density Fractions by Solid State13C CPMAS NMR Spectroscopy

2014 ◽  
Vol 45 (11) ◽  
pp. 1523-1537 ◽  
Author(s):  
S. M. Fazle Rabbi ◽  
Rasmus Linser ◽  
James M. Hook ◽  
Brian R. Wilson ◽  
Peter V. Lockwood ◽  
...  
Keyword(s):  
Organic Matter ◽  
Nmr Spectroscopy ◽  
Soil Organic Matter ◽  
Density Fractions

Characterization of organic matter in particle size and density fractions from a red-brown earth by solid state 13C NMR

Soil Research ◽  
1987 ◽  
Vol 25 (1) ◽  
pp. 71 ◽  
Author(s):  
JM Oades ◽  
AM Vassallo ◽  
AG Waters ◽  
MA Wilson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Particle Size ◽  
Organic Matter ◽  
Solid State ◽  
High Resolution ◽  
Iron Oxides ◽  
Density Fractions ◽  
13C Nuclear Magnetic Resonance ◽  
Solid State 13C Nmr

Size and density fractions separated from a red-brown earth have been analysed by high-resolution solidstate 13C nuclear magnetic resonance (n.m.r.) spectroscopy. Resonances from O-alkyl carbon (mainly carbohydrate) predominated in the spectra of the largest (250-2000 �m) fractions, whereas alkyl carbon resonances (mainly polymethylene) predominated in the spectra of clay fractions. Paramagnetics, mainly Fe3+, were found to influence the amount and type of carbon seen in 13C solid-state n.m.r. spectra of clay fractions containing more than several per cent iron oxides. Removal of iron oxides by reduction with dithionite allowed aromatics, carboxyls and carbohydrates to be detected by 13C n.m.r.

Characterization of dissolved organic matter (DOM) extracted from soils by hot water percolation (HWP)

2010 ◽  
Vol 59 (1) ◽  
pp. 99-108 ◽  
Author(s):  
M. Takács ◽  
Gy. Füleky
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Extraction Methods ◽  
Soil Samples ◽  
Hot Water ◽  
Soil Extracts ◽  
Water Percolation ◽  
Soil Humic Acid

The Hot Water Percolation (HWP) technique for preparing soil extracts has several advantages: it is easily carried out, fast, and several parameters can be measured from the same solution. The object of this study was to examine the possible use of HWP extracts for the characterization of soil organic matter. The HPLC-SEC chromatograms, UV-VIS and fluorescence properties of the HWP extracts were studied and the results were compared with those of the International Humic Substances Society (IHSS) Soil Humic Acid (HA), IHSS Soil Fulvic Acid (FA) and IHSS Suwannee Natural Organic Matter (NOM) standards as well as their HA counterparts isolated by traditional extraction methods from the original soil samples. The DOM of the HWP solution is probably a mixture of organic materials, which have some characteristics similar to the Soil FA fractions and NOM. The HWP extracted organic material can be studied and characterized using simple techniques, like UV-VIS and fluorescence spectroscopy.

Structural Characterization of Soil Organic Matter and Humic Acids in Particle-Size Fractions of an Agricultural Soil

2002 ◽  
Vol 66 (1) ◽  
pp. 129 ◽  
Author(s):  
Benny Chefetz ◽  
Jorge Tarchitzky ◽  
Ashish P. Deshmukh ◽  
Patrick G. Hatcher ◽  
Yona Chen
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Humic Acids ◽  
Structural Characterization ◽  
Agricultural Soil ◽  
Size Fractions ◽  
Particle Size Fractions

Influence of elevated soil temperature and biochar application on organic matter associated with aggregate-size and density fractions in an arable soil

2017 ◽  
Vol 241 ◽  
pp. 79-87 ◽  
Author(s):  
Dennis Grunwald ◽  
Michael Kaiser ◽  
Simone Junker ◽  
Sven Marhan ◽  
Hans-Peter Piepho ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Temperature ◽  
Aggregate Size ◽  
Arable Soil ◽  
Density Fractions

scholarly journals Characterization of Soil Organic Matter Individual Fractions (Fulvic Acids, Humic Acids, and Humins) by Spectroscopic and Electrochemical Techniques in Agricultural Soils

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1067
Author(s):  
Aleksandra Ukalska-Jaruga ◽  
Romualda Bejger ◽  
Guillaume Debaene ◽  
Bożena Smreczak
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Humic Substances ◽  
Humic Acids ◽  
Agricultural Soils ◽  
Fulvic Acids ◽  
Sorption Properties ◽  
Aliphatic Chains

The objective of this paper was to investigate the molecular characterization of soil organic matter fractions (humic substances (HS): fulvic acids-FAs, humic acids-HAs, and humins-HNs), which are the most reactive soil components. A wide spectrum of spectroscopic (UV–VIS and VIS–nearIR), as well as electrochemical (zeta potential, particle size diameter, and polydispersity index), methods were applied to find the relevant differences in the behavior, formation, composition, and sorption properties of HS fractions derived from various soils. Soil material (n = 30) used for the study were sampled from the surface layer (0–30 cm) of agricultural soils. FAs and HAs were isolated by sequential extraction in alkaline and acidic solutions, according to the International Humic Substances Society method, while HNs was determined in the soil residue (after FAs and HAs extraction) by mineral fraction digestion using a 0.1M HCL/0.3M HF mixture and DMSO. Our study showed that significant differences in the molecular structures of FAs, Has, and HNs occurred. Optical analysis confirmed the lower molecular weight of FAs with high amount of lignin-like compounds and the higher weighted aliphatic–aromatic structure of HAs. The HNs were characterized by a very pronounced and strong condensed structure associated with the highest molecular weight. HAs and HNs molecules exhibited an abundance of acidic, phenolic, and amine functional groups at the aromatic ring and aliphatic chains, while FAs mainly showed the presence of methyl, methylene, ethenyl, and carboxyl reactive groups. HS was characterized by high polydispersity related with their structure. FAs were characterized by ellipsoidal shape as being associated to the long aliphatic chains, while HAs and HNs revealed a smaller particle diameter and a more spherical shape caused by the higher intermolecular forcing between the particles. The observed trends directly indicate that individual HS fractions differ in behavior, formation, composition, and sorption properties, which reflects their binding potential to other molecules depending on soil properties resulting from their type. The determined properties of individual HS fractions are presented as averaged characteristics over the examined soils with different physico-chemical properties.

Geochemical characterization of the organic matter in the Devonian Pimenteiras Formation, Parnaiba Basin, Brazil – Implications for depositional environment and the potential of hydrocarbon generation

2021 ◽  
Vol 201 ◽  
pp. 108461
Author(s):  
Agostinho Mussa ◽  
Wolfgang Kalkreuth ◽  
Ana Maria Pimentel Mizusaki ◽  
Marcos Müller Bicca ◽  
Jørgen A. Bojesen-Koefoed
Keyword(s):  
Organic Matter ◽  
Depositional Environment ◽  
Hydrocarbon Generation ◽  
Geochemical Characterization ◽  
Parnaíba Basin

Organic matter characterization of the Lower Cretaceous tight reservoirs in the Danish North Sea

2021 ◽  
Vol 238 ◽  
pp. 103714
Author(s):  
Arka Rudra ◽  
Hamed Sanei ◽  
H.P. Nytoft ◽  
H.I. Petersen ◽  
Carlette Blok ◽  
...  
Keyword(s):  
Organic Matter ◽  
North Sea ◽  
Lower Cretaceous ◽  
Tight Reservoirs

Sources and compositional characterization of chromophoric dissolved organic matter in a Hainan tropical mangrove-estuary

2021 ◽  
pp. 126572
Author(s):  
Lu Yan ◽  
Xianjun Xie ◽  
Kang Peng ◽  
Ningdi Wang ◽  
Yuyao Zhang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Chromophoric Dissolved Organic Matter ◽  
Mangrove Estuary ◽  
Compositional Characterization
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