scholarly journals Characterization of humic substances from five macrophyte species decomposed under different nutrient conditions

Limnetica ◽  
2021 ◽  
Vol 40 (2) ◽  
pp. 267-278
Author(s):  
F. Bottino ◽  
B.P. Souza ◽  
R.J.S. Rocha ◽  
M.B. Cunha-Santino ◽  
I. Bianchini Jr.
Keyword(s):  
Humic Substances ◽  
Macrophyte Species ◽  
Nutrient Conditions

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.

Capillary isoelectric focusing (CIEF) for the characterization of humic substances

1997 ◽  
Vol 31 (8) ◽  
pp. 2037-2049 ◽  
Author(s):  
Ph. Schmitt ◽  
A.W. Garrison ◽  
D. Freitag ◽  
A. Kettrup
Keyword(s):  
Humic Substances ◽  
Isoelectric Focusing ◽  
Capillary Isoelectric Focusing

scholarly journals Molecular Weight Characterization of Humic Substances by MALDI-TOF-MS

2004 ◽  
Vol 52 (1) ◽  
pp. 29-32 ◽  
Author(s):  
Toshiyuki SHINOZUKA ◽  
Mitsuhiro SHIBATA ◽  
Tatsuaki YAMAGUCHI
Keyword(s):  
Molecular Weight ◽  
Humic Substances ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Tof Ms

Spectral and Chemical Characterization of Phosphates Associated with Humic Substances

2006 ◽  
Vol 70 (5) ◽  
pp. 1741-1751 ◽  
Author(s):  
Zhongqi He ◽  
Tsutomu Ohno ◽  
Barbara J. Cade-Menun ◽  
M. Susan Erich ◽  
C. Wayne Honeycutt
Keyword(s):  
Humic Substances ◽  
Chemical Characterization

Structural characterization of soil organic matter individual fractions (fulvic acids, humic acids and humins) in relation to potential sorption of organic contaminants 

2021 ◽  
Author(s):  
Aleksandra Ukalska-Jaruga ◽  
Romualda Bejger ◽  
Guillaume Debaene ◽  
Bozena Smreczak
Keyword(s):  
Molecular Weight ◽  
Humic Substances ◽  
Organic Contaminants ◽  
Particle Diameter ◽  
Fulvic Acids ◽  
Molecular Structures ◽  
Sorption Properties ◽  
Binding Potential ◽  
Aliphatic Chains

<p>The objective of this paper was to investigate the molecular characterization of individual humic substances ( fulvic acids-FAs, humic ascids-HAs, and humins-HNs), which are the most reactive soil components and exhibit high sorption capacity in relation to various groups of organic contaminants. A wide spectrum of spectroscopic (UV-VIS, VIS-nearIR), as well as electrochemical (zeta potential, particle size diameter, polidyspersity index), methods were applied to find the relevant differences in the behavior, formation, composition and sorption properties of HS fractions derived from various mineral soils.</p><p>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.</p><p>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.  </p><p>The observed trends directly indicate that individual HS fractions differ in behavior, formation, composition and sorption properties, which reflects their binding potential to different group of organic contaminants, but the general properties of individual fractions are similar and do not depend on the type of soil.</p><p><em>Acknowledgement: The studies were supported from the National Science Centre project No. 2018/29/N/ST10/01320 “Analysis of the fractional composition and sorption properties of humic substances in relation to various groups of organic contaminants”</em></p>

Kinetic aspects of humic substances derived from macrophyte detritus decomposition under different nutrient conditions

2019 ◽  
Vol 26 (16) ◽  
pp. 15931-15942
Author(s):  
Flávia Bottino ◽  
Marcela Bianchessi Cunha-Santino ◽  
Irineu Bianchini
Keyword(s):  
Humic Substances ◽  
Nutrient Conditions
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