| Issue |
E3S Web of Conf.
Volume 222, 2020
International Scientific and Practical Conference “Development of the Agro-lndustrial Complex in the Context of Robotization and Digitalization of Production in Russia and Abroad” (DAIC 2020)
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|---|---|---|
| Article Number | 05022 | |
| Number of page(s) | 6 | |
| Section | Modern Problems of Interaction Between Man and Nature, Man and Technology, and Social Institutions. Adequate Response of Science and Society to Global Challenges in the Context of Production Intellectualization | |
| DOI | https://doi.org/10.1051/e3sconf/202022205022 | |
| Published online | 22 December 2020 | |
Thermodynamic modeling of aqueous migration of chemical elements in irrigation water
1 Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, 119991, 19 Kosygina st., Moscow, Russia
2 East China University of Technology, 330013 Guanglan Avenue 418, Nanchang, China
* Corresponding author: sea@geokhi.ru
Research of migration forms in irrigation water of flooded fields contributes to understanding geochemical barrier formation and functioning. It can improve pollution and nutrification control in the soil-water-plant system since geochemical barriers promote concentrating chemical elements at different depths of a soil cross-section. The research aimed to simulate the aqueous migration of chemical elements and their precipitation in the flooded rice fields’ irrigation water to determine the potential of removing them from the solution at the sorption geochemical barrier. The samples of irrigation water were taken after harvesting in the Poyang Lake basin (China) and analyzed with a standard set of methods for natural water, including ICP-MS and ICP-AES. To assess the migration forms, the HCh software package was used. The thermodynamic values database was supplemented with free energies of formation of metal complexes with fulvic and humic acids for standard conditions. Modeling has shown that most of the considered chemical elements migrate in positively charging simple ions. The main agents of complexation with humic substances are Fe, Ca, and U. Kaolinite potentially precipitates from the irrigation water. Results show that sorption of positively charged simple ions and MoO42− on clay minerals should be under special attention.
© The Authors, published by EDP Sciences, 2020
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