Examination of thermal and acid hydrolysis procedures in characterization of soil organic matter

2000 ◽  
Vol 31 (1-2) ◽  
pp. 81-100 ◽  
Author(s):  
Pere Rovira ◽  
V. Ramón Vallejo
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Acid Hydrolysis

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.

Molecular characterization of soil organic matter from native vegetation–pasture–sugarcane transitions in Brazil

2016 ◽  
Vol 548-549 ◽  
pp. 450-462 ◽  
Author(s):  
Dener Márcio da Silva Oliveira ◽  
Judith Schellekens ◽  
Carlos Eduardo Pellegrino Cerri
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Molecular Characterization ◽  
Native Vegetation

Quantitative Characterization of Soil Organic Matter and Its Fractionation Products by Solid State High Resolution C-13 (CPMAS) Spectroscopy

1991 ◽  
Vol 46 (11-12) ◽  
pp. 982-988 ◽  
Author(s):  
R. Fründ ◽  
H.-D. Lüdemann
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Solid State ◽  
Soil Organic Matter ◽  
High Resolution ◽  
Extraction Procedure ◽  
Chemical Information ◽  
Organic Carbon Content ◽  
Quantitative Characterization

Abstract In a systematic study the organic carbon content of typical Germ an soils was studied by solid state C-13 CPM AS spectroscopy.In order to check the quantitative validity of the standard sodium hydroxide extraction procedure, which fractionates soil organic matter into hum in, humic acid, and fulvic acid also the high resolution solid state spectra of these fractions were determined.The chemical information obtained from these spectra is discussed.

Characterization of cultivation effects on soil organic matter

1990 ◽  
Vol 153 (2) ◽  
pp. 97-105 ◽  
Author(s):  
H.-R. Schulten ◽  
R. Hempfling ◽  
K. Haider ◽  
F. F. Gröblinghoff ◽  
H.-D. Lüdemann ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter

Improved Characterization of Soil Organic Matter by Thermal Analysis Using CO2/H2O Evolved Gas Analysis

2012 ◽  
Vol 46 (16) ◽  
pp. 8921-8927 ◽  
Author(s):  
José M. Fernández ◽  
Clément Peltre ◽  
Joseph M. Craine ◽  
Alain F. Plante
Keyword(s):  
Thermal Analysis ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Evolved Gas Analysis ◽  
Gas Analysis ◽  
Evolved Gas
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