Optimal Parameters for the Production of Humic Acids from Brown Coals with Specific Structural-Group Composition

2019 ◽  
Vol 53 (5) ◽  
pp. 253-261 ◽  
Author(s):  
S. I. Zherebtsov ◽  
K. S. Votolin ◽  
N. V. Malyshenko ◽  
O. V. Smotrina ◽  
J. Dugarjav ◽  
...  
Keyword(s):  
Humic Acids ◽  
Group Composition ◽  
Optimal Parameters ◽  
Structural Group ◽  
Brown Coals ◽  
Structural Group Composition

Structural-Group Composition and Biological Activity of Humic Acids Obtained from Brown Coals of Russia and Mongolia

2019 ◽  
Vol 53 (3) ◽  
pp. 145-151 ◽  
Author(s):  
S. I. Zherebtsov ◽  
N. V. Malyshenko ◽  
K. S. Votolin ◽  
V. A. Androkhanov ◽  
D. A. Sokolov ◽  
...  
Keyword(s):  
Biological Activity ◽  
Humic Acids ◽  
Group Composition ◽  
Structural Group ◽  
Brown Coals ◽  
Structural Group Composition

scholarly journals Humic-like acid derived from 1,2-naphthoquinone

2020 ◽  
Vol 8 (2) ◽  
pp. 140-149
Author(s):  
Valentina Litvin ◽  
Roger Abi Njoh
Keyword(s):  
Humic Acids ◽  
Group Composition ◽  
Spectral Characteristics ◽  
Original Method ◽  
Volumetric Method ◽  
Structural Group ◽  
Singlet Signal ◽  
G Factor ◽  
Redox Capacity ◽  
Structural Group Composition

A new fast and original method for producing synthetic humic acids by oxidation of 1,2-naphthoquinone by oxygen in an alkaline medium has been proposed. The elemental, structural-group composition and spectral characteristics of the obtained humic-like substances correspond to those of natural humic substances. The stoichiometry of the reaction was established by the volumetric method. The redox capacity of humic acids increased from 0.43 to 3.68 mmol∙g-1 with increasing solution from pH 5 to 11. Humic-like acids featured an ESR singlet signal with a width of 3.8 Gauss and g-factor close to the g-factor of the free electron (g = 2.0033).

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