Humic-based polyelectrolytes: effect on Cd and Pb mobility in contaminated soils

Gruzdenko, D.; Yakimenko, O.; Stepanov, A.; Panova, I.; Yaroslavov, A.

Авторы: Gruzdenko D., Yakimenko O., Stepanov A., Panova I., Yaroslavov A.
Сборник: Book of Abstracts of the Seventh International Conference of the CIS IHSS on humic innovative technologies"Humic substances and technologies for resilience" (HIT-2022), Sailing Club “Vodnik”, Moscow, November 18-21, 2022
Тезисы
Год издания: 2022
Первая страница: 99
Последняя страница: 99
DOI: 10.36291/HIT.2022.084
Аннотация: Interpolyelectrolyte complexes (IPECs), the products of interaction between two oppositelycharged polyelectrolytes (PEs), have been suggested for soil structure stabilization. An ability ofIPECs to improve soil hydrophysical properties, prevent soil erosion and act as soil conditionershave been studied in our previous works [1]. The efficacy of IPECs was dependent both onchemical composition of IPEC and soil properties. Using humic substances as the polyanionicingredient of IPEC is a prospective approach to develop environmental-friendly and effectiveformulations.In this study we used two IPECs: positively and negatively charged. Both were preparedfrom the commercial polymers with the excess either of polycation or polyanion: cationicpoly(diallyldimethylammoniumchloride) (PDDA) and anionic biopolymer lignohumate (LH), ahumic-based plant growth stimulator. The objective of the study was to assess the effects of thethree PEs (LH, IPEC+ and IPEC-) on mobilization/immobilization of Cd and Pb in soil spiked withthese metals, as well as on soil structural composition and plant growth in a model experiment.Experiments were conducted in a small-plot trial using artificial soil consisting from sand(48%), clay (48%) and peat (4%). Soils were first treated with 2% PE-solutions (1.5L per plot)and then spiked with CdCl2 and Pb(CH3COO)2 in rates equal to 3 tentative allowableconcentrations and Festuca pratensis was sown. After 2 months plant biomass, soil aggregatecomposition and content of Cd and Pb (mobile species in ammonium acetate buffer, pH 4.8)were determined.Both IPECs and LH decreased the content of mobile species of cadmium and lead in soilcomparably to the spiked control. The highest detoxifying effect was observed for the negativelycharged IPEC, with a 34-35% decrease of Cd and Pb mobile species. Positively charged IPECand LH also demonstrated detoxication ability: content of cadmium and lead decreased by 21%and 24-25%, respectively.In phytotests all polymers did not show a significant effect on plant growth parameters.Composition of soil structural aggregates was not significantly affected by all the PEs andthe share of agronomically valuable aggregates (0.25-5 mm) varied within 84-89%.The results of the work show that negatively charged IPEC and LH have the potential todecrease content of mobile HM-species and thus to mitigate their toxicity for plants, but did notprovide a significant effect on soil structure for the used soil. Positively charged IPEC destroylarge soil aggregates and can improve soil structure in a case of cloddy soils. In general, humicbased IPECs can be regarded as a tool to create productive artificial soils.
Добавил в систему: Якименко Ольга Сергеевна

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