Protein-derived structures determines the redox capacity of humic acids formed during hyperthermophilic composting

2021 ◽  
Vol 126 ◽  
pp. 810-820
Author(s):  
Xiaoming Liu ◽  
Yueqiang Wang ◽  
Weiwu Wang ◽  
Wenfeng Huang ◽  
Zhen Yu ◽  
...  
Keyword(s):  
Humic Acids ◽  
Redox Capacity

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).

The effect of redox capacity of humic acids on hexachlorobenzene dechlorination during the anaerobic digestion process

2019 ◽  
Vol 26 (6) ◽  
pp. 6099-6106 ◽  
Author(s):  
Dongyang Li ◽  
Beidou Xi ◽  
Yingjun Li ◽  
Xiaowei Wang ◽  
Tianxue Yang ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Humic Acids ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Redox Capacity

ROLE OF ADDED PHOSPHOGYPSUM AND HUMIC ACIDS IN THE KINETIC RELEASE OF SALT FROM SALT AFFECTED SOIL (SALINE – SODIC)

2020 ◽  
pp. 15-27
Keyword(s):  
Electrical Conductivity ◽  
Humic Acids ◽  
Release Rate ◽  
Release Kinetics ◽  
Sodium Adsorption Ratio ◽  
Salt Affected Soil ◽  
Two Factors ◽  
Dissolved Ions ◽  
Kinetic Release

In order to study the effect of phosphogypsum and humic acids in the kinetic release of salt from salt-affected soil, a laboratory experiment was conducted in which columns made from solid polyethylene were 60.0 cm high and 7.1 cm in diameter. The columns were filled with soil so that the depth of the soil was 30 cm inside the column, the experiment included two factors, the first factor was phosphogypsum and was added at levels 0, 5, 10 and 15 tons ha-1 and the second-factor humic acids were added at levels 0, 50, 100 and 150 kg ha-1 by mixing them with the first 5 cm of column soil and one repeater per treatment. The continuous leaching method was used by using an electrolytic well water 2.72 dS m-1. Collect the leachate daily and continue the leaching process until the arrival of the electrical conductivity of the filtration of leaching up to 3-5 dS m-1. The electrical conductivity and the concentration of positive dissolved ions (Ca, Mg, Na) were estimated in leachate and the sodium adsorption ratio (SAR) was calculated. The results showed that the best equation for describing release kinetics of the salts and sodium adsorption ratio in soil over time is the diffusion equation. Increasing the level of addition of phosphogypsum and humic acids increased the constant release velocity (K) of salts and the sodium adsorption ratio. The interaction between phosphogypsum and humic acids was also affected by the constant release velocity of salts and the sodium adsorption ratio. The constant release velocity (K) of the salts and the sodium adsorption ratio at any level of addition of phosphogypsum increased with the addition of humic acids. The highest salts release rate was 216.57 in PG3HA3, while the lowest rate was 149.48 in PG0HA0. The highest release rate of sodium adsorption ratio was 206.09 in PG3HA3, while the lowest rate was 117.23 in PG0HA0.

Peculiarities of the Influence of Humic Acids on the Development of Plankton Algae

2011 ◽  
Vol 47 (1) ◽  
pp. 97-104
Author(s):  
V. A. Medved' ◽  
P. D. Klochenko ◽  
O. V. Vasilenko ◽  
T. A. Vasilchuk
Keyword(s):  
Humic Acids

Peculiarities of Energetic, Nitrogen, and Phosphorus Metabolism in Blue-Green Algae under the Influence of Humic Acids

2008 ◽  
Vol 44 (6) ◽  
pp. 74-82
Author(s):  
O. V. Sinyuk ◽  
V. V. Grubinko ◽  
P. D. Klochenko ◽  
T. A. Vasilchuk
Keyword(s):  
Green Algae ◽  
Humic Acids ◽  
Phosphorus Metabolism ◽  
Nitrogen And Phosphorus ◽  
Blue Green Algae

Interactions of Aluminum and Iron(III) Salts with Humic Acids in A Model Alkaline Solution

2008 ◽  
Vol 23 (3) ◽  
pp. 681-691
Author(s):  
Bartosz Libecki ◽  
Jerzy Dziejowski
Keyword(s):  
Humic Acids ◽  
Alkaline Solution

Changes in the Humic Acid–Metal Complexation Characteristics Depending on Humification Degree / Humīnskābju – Metālu Kompleksveidošanās Rakstura Izmaiņas Atkarībā No Humifikācijas Pakāpes

2012 ◽  
Vol 51 (3) ◽  
pp. 228-237
Author(s):  
D. Dudare ◽  
M. Klavins
Keyword(s):  
Humic Acid ◽  
Stability Constants ◽  
Humic Acids ◽  
Complex Stability ◽  
Peat Layer ◽  
Raised Bog ◽  
Complexing Capacity ◽  
Humification Degree ◽  
Complexation Process ◽  
Complex Stability Constants

The aim of this study is to determine the Cu(II) complexing capacity and stability constants of Cu(II) complexes of humic acids isolated from two well-characterized raised bog peat profiles in respect to the basic properties and humification characteristics of the studied peats and their humic acids. The complex stability constants significantly change within the studied bog profiles and are well correlated with the age and decomposition degree of the peat layer from which the humic acids have been isolated. Among factors that influence this complexation process, molecular mass and ability to form micellar structures (supramolecules) of humic substances are of key importance.

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