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Humic substances: hypotheses and reality (a review)статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 12 января 2022 г.
- Авторы: Zavarzina A.G., Danchenko N.N., Demin V.V., Artemyeva Z.S., Kogut B.M.
- Журнал: Eurasian Soil Science
- Том: 54
- Номер: 12
- Год издания: 2021
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 1826
- Последняя страница: 1854
- Оригинальные версии: Гуминовые вещества: гипотезы и реальность (обзор)
- DOI: 10.1134/S1064229321120164
- Аннотация: The term humic substances (HS) refers to a group of heterogeneous, dark-colored polydispersesubstances found in soils, peats, natural waters, and sediments. It is hypothesized that HSs are formed as a result of degradation and transformation of biomolecules of organic residues and free radical condensation reactions (a process called humification). Humic substances are classified as a special category of naturalcompounds that have no analogues in the living organisms, that are chemically distinct from the biomolecules of plant and microbial tissues, and are resistant to biodegradation. On the basis of their solubility in alkalis, HSs are divided into humic acids (HAs, soluble, precipitated at pH < 2), fulvic acids (FAs, soluble at all pHvalues), and humin (insoluble residue). The review provides a critical analysis of the HS terminology and nomenclature, the method of extraction of HS from natural objects, and the hypotheses describing their formation. The ambiguity and duality of the concept of HSs (specific compounds and the sum of operational fractions) are demonstrated, as well as an arbitrary character of the division of organic matter (OM) into thedark-colored compounds of poorly defined structure (HSs) and the substances with a known structure (non- HSs). The interpretation of HSs as specific products of a secondary synthesis requires revision. The possibility of extracellular free radical reactions in soils is high; however, a quantitative contribution of the correspondingproducts to the natural OM has not been established. The traditional alkaline extraction should be considered as a method for isolation of hydrophilic polar substances, while the acidic precipitation as their concentration for further analysis. The historical names of humic fractions (HAs, FAs, and humin) should be retained as well-established generic terms and names of the preparations obtained in a certain way withoutattaching unique features and specificity to all components of these fractions. The CHA/CFA (or CHA/Corg) ratios are simple and convenient indicators of the types of humus reflecting bioclimatic conditions of its formation.
- Добавил в систему: Заварзина Анна Георгиевна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | Zavarzina_et_al_2021_EurasSS.pdf | 1,4 МБ | 11 января 2022 [AZavarzina] | |
| 2. | SoilSci2112016ZavarzinaKOR.pdf | SoilSci2112016ZavarzinaKOR.pdf | 544,0 КБ | 24 ноября 2021 [AZavarzina] |