Qualitative Assessment of the Contribution of Various Components to Cu(II) Adsorption by Alluvial Soddy-Gley Soil

Pyatova, M.I.; Tolpeshta, I.I.; Izosimova, Y.G.; Karpukhin, M.M.; Barsova, N.Y.

Авторы: Pyatova M.I., Tolpeshta I.I., Izosimova Yu G., Karpukhin M.M., Barsova N.Yu
Журнал: Eurasian Soil Science
Том: 56
Номер: 2
Год издания: 2023
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 132
Последняя страница: 146
DOI: 10.1134/S1064229322700132
Аннотация: Qualitative assessment of the contribution of organic matter, nonsilicate iron compounds, and clayminerals to the adsorption of Cu(II) by alluvial soddy-gley soil was performed by the method of sequentialremoval of various types of sorption surfaces under conditions of laboratory equilibrium experiments. It wasfound that the contribution of each of the components is determined both by the ability to form surface innerspherecomplexes at pH-dependent positions and by the availability of sorption centers in loci of constantcharge of clay minerals. The main components adsorbing Cu(II) are represented by organic matter and nonsilicateiron compounds in the AY horizon and by clay minerals in the ABg and BDg horizons. Ion exchangewith H+ on functional groups of organic matter and surface hydroxyls of nonsilicate iron compounds is themain mechanism of Cu(II) adsorption in the AY horizon. In the underlying horizons, Cu(II) is mainlyadsorbed as a result of ion exchange with cations, which compensate for the constant charge of the crystal latticesof clay minerals. Soil treatment with 10% H2O2 and the Mehra–Jackson reagent results in a change inthe surface area and quality and quantity of sorption centers, as well as in the transformation of the crystallattices of clay minerals. These changes should be taken into account, when assessing the contribution of soilcomponents to the sorption of metal ions.
Добавил в систему: Изосимова Юлия Геннадьевна

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