Elemental composition and structural peculiarities of humic acids in bog waters of taiga zone

2014 ◽  
Vol 84 (13) ◽  
pp. 2562-2571 ◽  
Author(s):  
T. T. Efremova ◽  
S. P. Efremov ◽  
N. I. Pavlenko ◽  
N. G. Maksimov
Keyword(s):  
Elemental Composition ◽  
Humic Acids ◽  
Taiga Zone ◽  
Structural Peculiarities ◽  
Bog Waters

scholarly journals THE CHARACTERISTIC FEATURES OF THE ELECTRONIC ABSORPTION SPECTRA AND ELEMENTAL COMPOSITION OF HUMIC ACIDS OF DIFFERENT TYPES AND TYPES OF PEAT KHANTY-MANSIYSK AUTONOMOUS OKRUG - YUGRA

2017 ◽  
Vol 13 (4) ◽  
pp. 7-16
Author(s):  
Evgeniy Mikhailovich Osnitsky ◽  
Oleg Stepanovich Kuzmenko ◽  
Ksenya Valeryevna Dobryakovа ◽  
Davyd Vladimirovich Boroday ◽  
Mikhail Petrovich Sartakov ◽  
...  
Keyword(s):  
Elemental Composition ◽  
Absorption Spectra ◽  
Humic Acids ◽  
Electronic Absorption ◽  
Electronic Spectra ◽  
Electronic Absorption Spectra ◽  
Middle Taiga ◽  
Taiga Zone ◽  
Extinction Coefficients ◽  
Characteristic Features

The article reveals the results of studies of the humic acids electronic spectra for various types and kinds of peat in the middle-taiga zone of Western Siberia (Khanty-Mansiysk Autonomous Okrug - Yugra). It was found that the increase in optical density is observed in samples of humic acids which were extracted from the peat with a high degree of decomposition (40-65 %). At the first approximation the interpretation of received electronic spectra gives reason to range humic acids in the order with increasing proportion of aromatic structures share in macromolecules in the following order: 1) peat humic acids having a degree of expansion from 0 to 35 % with the content of a large number of peat-forming plants, where the extinction coefficients vary from 0.039 to 0.054 or sphagnum peat with the same degree of decomposition with the sphagnum containing 95-100 %, where the extinction coefficients have values between 0.030 and 0.042; 2) humic acids of all types and kinds of peat with a degree up to 35 %, where the extinction coefficients are from 0.042 to 0.068; 3) humic acid of peats of all examined types and species with a degree of decomposition from 40 % to 65 %, where the extinction coefficients vary from 0.059 to 0.087. Although the method of electron spectroscopy is an important tool in the study of humification processes in peat, it has a limited informative value due to unresolved spectra. Thus, peat humic acids with various botanical composition and various degree of decomposition are characterized by similar absorption spectra in the visible area in the form of a monotone increasing of absorption in short wavelength interval and differ from each other only by the absorption intensity. Based on the obtained values of the electronic absorption spectra of the GK and the magnitudes of their degree of benzoindole (α), which are calculated by the results of elemental analysis, the obtained information about the ratio of aromatic and aliphatic fragments in the molecules of humic acids, i.e. the information about the structural organization of the molecule . For the conditions of the Khanty-Mansi Autonomous Okrug - Yugra in all samples of peat humic acids did not reveal the dependence of their elemental composition from the types of source of peat, from the peculiarities of their species caused by the location and the specifics of peat formation.

Characterization of Humic Acids Extracted From Egyptian Sediment by Elemental Composition, NMR and FTIR

2019 ◽  
Vol 12 (5) ◽  
pp. 221-227
Author(s):  
Emad K. Radwan ◽  
Mohamed B.M. Ibrahim ◽  
Ahmed S. Moursy ◽  
Hany H. Abdel Ghafar
Keyword(s):  
Elemental Composition ◽  
Humic Acids

scholarly journals The effect of fertilization with brown coal on Haplic Luvisol humic acids

2011 ◽  
Vol 48 (No. 1) ◽  
pp. 33-39 ◽  
Author(s):  
B. Dębska ◽  
A. Maciejewska ◽  
J. Kwiatkowska
Keyword(s):  
Thermal Decomposition ◽  
Elemental Composition ◽  
Humic Acids ◽  
Brown Coal ◽  
Decomposition Process ◽  
Lower Content

The influence of fertilization with brown coal (used as preparation called Rekulter) on properties of humic acids extracted from haplic luvisol was studied. Characteristics of humic acids were identified by their elemental composition, thermal decomposition, and infrared and UV-VIS spectra. It was found that humic acids formed during decomposition process of Rekulter in soil were characterised by a higher content of carbon (38.6% versus 35.4%), a lower content of nitrogen (1.50% versus 2.73%) and a higher resistance to thermal decomposition, when compared with humic acids extracted from soils without Rekulter application. Due to special properties of Rekulter, additional liming did not affect the properties of humic acids.

scholarly journals Humic substances elemental composition of selected taiga and tundra soils from Russian European North-East

2017 ◽  
Vol 38 (2) ◽  
pp. 125-147 ◽  
Author(s):  
Evgeny Lodygin ◽  
Vasily Beznosikov ◽  
Evgeny Abakumov
Keyword(s):  
Organic Matter ◽  
Elemental Composition ◽  
Humic Substances ◽  
Humic Acids ◽  
Mineral Soil ◽  
Formation Mechanisms ◽  
Tundra Soils ◽  
North East ◽  
European North ◽  
Organic Matter Stabilization

Abstract Soils of Russian European North were investigated in terms of stability and quality of organic matter as well as in terms of soils organic matter elemental composi­tion. Therefore, soil humic acids (HAs), extracted from soils of different natural zones of Russian North-East were studied to characterize the degree of soil organic matter stabilization along a zonal gradient. HAs were extracted from soil of different zonal environments of the Komi Republic: south, middle and north taiga as well as south tundra. Data on elemental composition of humic acids and fulvic acids (FAs) extracted from different soil types were obtained to assess humus formation mechanisms in the soils of taiga and tundra of the European North-East of Russia. The specificity of HAs elemental composition are discussed in relation to environmental conditions. The higher moisture degree of taiga soils results in the higher H/C ratio in humic substances. This reflects the reduced microbiologic activity in Albeluvisols sods and subsequent conser­vation of carbohydrate and amino acid fragments in HAs. HAs of tundra soils, shows the H/C values decreasing within the depth of the soils, which reflects increasing of aromatic compounds in HA structure of mineral soil horizons. FAs were more oxidized and contains less carbon while compared with the HAs. Humic acids, extracted from soil of different polar and boreal environments differ in terms of elemental composition winch reflects the climatic and hydrological regimes of humification.

scholarly journals Elemental composition of humic acids from raised bog peat profiles

2016 ◽  
Vol 15 ◽  
pp. 23-27
Author(s):  
Māris Kļaviņš ◽  
◽  
Oskars Purmalis ◽  
Inese Silamiķele ◽  
◽  
...  
Keyword(s):  
Elemental Composition ◽  
Humic Acids ◽  
Raised Bog

Functional and Elemental Composition of Humic Acids of Sapropels of the River Ob’s Left Bank of Khmao-Yugra

2019 ◽  
Vol 16 (11) ◽  
pp. 4601-4604
Author(s):  
M. Osnitsky Evgeny ◽  
A. Gurova Olga ◽  
V. Boroduy Davyd ◽  
V. Litvinenko Natalia ◽  
V. Grekhova Iraida
Keyword(s):  
Elemental Composition ◽  
Functional Groups ◽  
Humic Acids ◽  
Chemical Elements ◽  
Left Bank ◽  
Degree Of Aromaticity ◽  
Maximum Proportion ◽  
The Relationship ◽  
Khanty Mansi Autonomous ◽  
Qualitative And Quantitative Characteristics

This article describes qualitative and quantitative characteristics of chemical elements and acidbase functional groups of humic acids (HA) in five lakes of the left bank of the Ob of Khanty-Mansi Autonomous Okrug-Yugra. The data on their elemental composition (CNHO), atomic ratios (H/C, O/C) carboxyl (COOH) and phenolic (OH) functional groups have been presented. The relationship between the elemental and functional composition of HA has been traced. It is found that with increasing hydrogen content, the percentage of carboxyl groups in the macromolecule of HA increases, the proportion of aromatic moieties reduces, and with increasing oxygen content the number of phenolic hydroxyls increases. According to the chart of atomic ratios describing the content of aromatic and aliphatic parts, HA are placed in the sequence, characterizing the maximum proportion of aromatic structures. Clearly there is a group of HA of lake Shchuchye sapropel, which is characterized by a maximum degree of aromaticity, followed by in decreasing order according to the contents of the Carom humic acids of sapropels of lakes Srednesatyginskiy Tuman, Nyartur, Medvezhye and Satyginskiy Tuman. The highest content of the Carom is typical for the more formed, “mature” HA.

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 The soils elemental composition of vertical zonality of the Western Tien Shan

2019 ◽  
Vol 5 (3) ◽  
pp. 96-103
Author(s):  
N. Raupova ◽  
S. Abdullaev
Keyword(s):  
Carbon Content ◽  
Elemental Composition ◽  
Humic Acids ◽  
C:N Ratio ◽  
Atomic Ratio ◽  
Tien Shan ◽  
Low Carbon ◽  
Aromatic Carbon ◽  
Vertical Zoning ◽  
Vertical Zonality

The elemental composition allows to obtain information about the principles of humic acids structure, some of their properties, as well as to identify chemical changes and processes occurring in the process of humification. Studies of the elemental composition of humic acids of the main types and subtypes of soils of the vertical zoning of the Western Tien Shan show that the carbon content in them increases from grey soils to mountain brown soils. the low carbon content in the series is accompanied by a narrow C:N ratio, which indicates a smaller condensation of the aromatic carbon grid and the severity of the side chains. The atomic ratio of C:N in humic acids of soils of the Western Tien Shan is 11–25. The narrowest ratio of C:N is observed in sierozems, and the transition from them to brown this ratio expands.

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