esoilБюллетень Почвенного института имени В.В. ДокучаеваDokuchaev Soil Bulletin0136-16942312-4202V.V. Dokuchaev Soil Science Institute10.19047/0136-1694-2024-SPYC-37-72esoil-850Research ArticleСпецвыпуск по результатам молодежной конференцииSpecial Issue "Selected papers from Young Scientists Conference 2022"Сорбция фульвокислоты на подфракциях ила, выделенных из минеральных горизонтов торфянисто-подзолисто-глееватой почвыAdsorption of fulvic acid on clay subfractions isolated from mineral horizons of peat-podzol-gley soilhttps://orcid.org/0000-0002-9991-6718КолчановаК. А.KolchanovaK. A.

Ксения Колчанова

119991, Москва, Ленинские горы, 1; 119017, Москва, Пыжевский пер, 7, стр. 2

1 Leninskie Gori, Moscow 119234; 7 Bld. 2 Pyzhevskiy per., Moscow 119017

kolchanovakseniia@yandex.ruТолпештаИ. И.TolpeshtaI. I.

Инна Толпешта

119991, Москва, Ленинские горы, 1

1 Leninskie Gori, Moscow 119234

sokolt651@mail.ruИзосимоваЮ. Г.IzosimovaU. G.

Юлия Изосимова

119991, Москва, Ленинские горы, 1

1 Leninskie Gori, Moscow 119234

sokolt651@mail.ruМГУ им. М.В. Ломоносова; ФИЦ “Почвенный институт им. В.В. Докучаева”РоссияLomonosov Moscow State University; Federal Research Centre “V.V. Dokuchaev Soil Science Institute”Russian FederationМГУ им. М.В. ЛомоносоваРоссияLomonosov Moscow State UniversityRussian Federation20242911202400Специальный выпуск по материалам VII конференции молодых ученых “Почвоведение: Горизонты будущего. 2023"3772Copyright © Колчанова К.А., Толпешта И.И., Изосимова Ю.Г., 20242024Колчанова К.А., Толпешта И.И., Изосимова Ю.Г.Kolchanova K.A., Tolpeshta I.I., Izosimova U.G.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://bulletin.esoil.ru/jour/article/view/850

Изучение взаимодействий органического вещества с различными по размеру и составу минералогическими фракциями почвы способствует созданию прогнозных моделей по закреплению органического углерода в почвах и его устойчивости к биодеградации. В работе изучали сорбцию фульвокислоты (ФК), полученной из горизонта Н торфянисто-подзолисто-глееватой почвы на подфракциях ила, выделенных из горизонтов ELG и Ecng той же почвы: 0–0.2 мкм (I), 0.2–0.06 мкм (II), 0.06–0.02 мкм (III) и <0.02 мкм (IV). Установлено, что в пересчете на единицу массы больше ФК сорбируют подфракции III и IV, обладающие большей площадью поверхности. В пересчете на единицу площади поверхности наблюдается обратная зависимость: чем крупнее фракция, тем больше на ней сорбируется ФК. Все подфракции ила, выделенного из обоих горизонтов, сорбируют преимущественно гидрофобные компоненты ФК, однако в более тонких подфрациях, практически не содержащих каолинита, вклад гидрофильных компонентов в общую сорбцию возрастает. В условиях проведенного эксперимента молекулы ФК с молекулярной массой 20 кДа не сорбировались в микропорах, имеющих средний размер ≈ 3.7 нм. Основным механизмом сорбции ФК на подфракциях ила являются гидрофобные взаимодействия. Гидрофильные компоненты ФК сорбируются посредством электростатических взаимодействий – путем лигандного обмена на боковых сколах глинистых минералов и с образованием мостиковых связей с ионом Ca2+, занимающим обменные позиции в глинах.

We studied the adsorption of fulvic acid (FA) obtained from the H horizon of peaty-podzolic-gleyic soil on sludge subfractions isolated from the ELG and Ecng horizons of the same soil: 0–0.2 µm (I), 0.2–0.06 µm (II) , 0.06–0.02 µm (III) and <0.02 µm (IV). It has been established that, in terms of unit mass, more FAs are sorbed by subfractions III and IV, which have a larger surface area. In terms of per unit surface area, an inverse relationship is observed: the larger the fraction, the more FA is sorbed on it. All subfractions of sludge isolated from both horizons sorb predominantly hydrophobic components of FA, but in the finer subfractions, which practically do not contain kaolinite, the contribution of hydrophilic components in total sorption increases. Under the experimental conditions, FA molecules with a molecular weight of 20 kDa were not adsorbed in micropores with an average size of ≈ 3.7 nm. The main mechanism of FA sorption on sludge subfractions is hydrophobic interactions. The hydrophilic components of FA are sorbed through electrostatic interactions, through ligand exchange on lateral cleaved clay minerals and with the formation of bridging bonds with the Ca2+ ion occupying exchange positions in clays.

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The authors declare that there are no conflicts of interest present.