Aspects of structural features in lignite and lignite humic acids

2006 ◽  
Vol 87 (9) ◽  
pp. 829-839 ◽  
Author(s):  
J. Peuravuori ◽  
P. Žbánková ◽  
K. Pihlaja
Keyword(s):  
Humic Acids ◽  
Structural Features ◽  
Lignite Humic Acids

Separation and identification of amino acids from lignite humic acids by thin layer chromatography

Fuel ◽  
1985 ◽  
Vol 64 (7) ◽  
pp. 1017-1019 ◽  
Author(s):  
Laura Damian ◽  
Constantin Mărutoiu ◽  
Gavril Niac
Keyword(s):  
Amino Acids ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Humic Acids ◽  
Lignite Humic Acids ◽  
Layer Chromatography

Analysis of Structural Features of Humic Acids Fractions after Mechanochemical Modification

2015 ◽  
Vol 1085 ◽  
pp. 3-6 ◽  
Author(s):  
Malika P. Mirzobekzoda ◽  
Elizaveta V. Maltseva ◽  
Natalya S. Shekhovtsova
Keyword(s):  
Chemical Composition ◽  
Ir Spectroscopy ◽  
Humic Acids ◽  
Fulvic Acids ◽  
Structural Features ◽  
Acid Base ◽  
Structural Composition ◽  
Mechanochemical Modification ◽  
The Impact ◽  
First Time

Humic substances are the major components of soil, peat and brown coal. They can be fractionating into fulvic acids (FA), brown humic acids (BHA) and gray humic acids (GHA). In this work we investigated the influence of mechanochemical modifications on structural composition of HAs main fractions using the methods of IR and 1H MRS spectroscopy. The IR spectroscopy results has shown that HA has different chemical composition in comparison with GHA and BHA. Potentiometric titration showed that mechanoactivation (MA) with thiourea increases the amount of oxygen-containing groups up to 2.5. For the first time we studied the impact of modifying agent of thiourea on the structural composition and acid-base properties of HAs major fractions - GHA and BHA during the mechanoactivation process.

Modification of polymer–bitumen binder by lignite humic acids

2016 ◽  
Vol 59 (1) ◽  
pp. 23-26
Author(s):  
A. S. Lavrova ◽  
Yu. A. Urcheva ◽  
A. M. Syroezhko ◽  
V. M. Strakhov
Keyword(s):  
Humic Acids ◽  
Lignite Humic Acids

Low-molecular-weight fractions of Bulgarian lignite humic acids

Fuel ◽  
1981 ◽  
Vol 60 (8) ◽  
pp. 685-688 ◽  
Author(s):  
Elena M. Balabanova-Radonova ◽  
Maia D. Stefanova
Keyword(s):  
Molecular Weight ◽  
Humic Acids ◽  
Low Molecular Weight ◽  
Lignite Humic Acids ◽  
Molecular Weight Fractions

Characteristics of HACaP complexes prepared from lignite humic acids

Fuel ◽  
1983 ◽  
Vol 62 (8) ◽  
pp. 956-958 ◽  
Author(s):  
M.Teresa Martinez ◽  
C. Romero ◽  
JoséM. Gavilán
Keyword(s):  
Humic Acids ◽  
Lignite Humic Acids

scholarly journals Structural features of humic acids from a sedimentary sequence in the Guadiana estuary (Portugal–Spain border)

2009 ◽  
Vol 40 (1) ◽  
pp. 20-28 ◽  
Author(s):  
O. Polvillo ◽  
J.A. González-Pérez ◽  
T. Boski ◽  
F.J. González-Vila
Keyword(s):  
Humic Acids ◽  
Structural Features ◽  
Sedimentary Sequence ◽  
Guadiana Estuary

The composition of lignite humic acids

Fuel ◽  
1993 ◽  
Vol 72 (5) ◽  
pp. 681-684 ◽  
Author(s):  
M. Stefanova ◽  
D. Velinova ◽  
S.P. Marinov ◽  
R. Nikolova
Keyword(s):  
Humic Acids ◽  
Lignite Humic Acids

scholarly journals Humus substances in the swamp ecosystems of taiga zone of Western Siberia

2021 ◽  
Vol 4 (4) ◽  
Author(s):  
T. T. Efremova ◽  
S. P. Efremov
Keyword(s):  
Humic Acids ◽  
Solid Phase ◽  
Structural Features ◽  
Taiga Zone ◽  
Left Bank ◽  
Wetland Ecosystems ◽  
Oxygenated Compounds ◽  
Humus Substances ◽  
Humus Type ◽  
Organic Carbon Stock

Eutrophic peatlands with a predominantly humate type of humus is dominated according to content of hydrophobic humus substances accumulated in the solid phase of peat. Oligotrophic peatlands with fulvate type of humus are characterized by minimal storages. Mesotrophic peatlands occupy a transitional position, both in terms of storage and in terms of the humus type – humate-fulvate. Hydrophilic components of the water phase are characterized by fulvate humus, regardless of the type of peatland, but differ in the proportion of the contribution of humus substances in the amphiphilic system of swamp ecosystems. It is the highest in the thickness of the oligotrophic peatland almost 31%, slightly lower in the mesotrophic – 25% and much less in the eutrophic – 6%. Structural features of macromolecules of humic acids of swamp waters of various genesis are determined. The humic acids of mesotrophic waters are adjacent to the group of reduced compounds, they are more enriched with aromatic structures and carboxyl groups in relation to oligotrophic waters. The humic acids of oligotrophic waters belong to a group of oxygenated compounds, have low enrichment of nitrogen, contain more methoxyl carbon and carbohydrates (polysaccharides). These structural features are caused by geochemistry of waters feeding the peatlands and specific mechanisms of humic acids synthesis on the swamps of different genesis. The volume of dissolved organic carbon stock from wetland ecosystems through system of taiga rivers of left bank of Middle Ob is 805 kt per year.

scholarly journals Study of Lignite Humic Acids.(II) Methylation of Humic Acids.

1954 ◽  
Vol 33 (7) ◽  
pp. 373-379
Author(s):  
Kozo Higuchi ◽  
Michio Tsuyuguchi
Keyword(s):  
Humic Acids ◽  
Lignite Humic Acids
Sign in / Sign up

Export Citation Format

Share Document