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OSIPOVA, Nana; KVERNADZE, Tamara; BURKIASHVILI, Nino; JAPARIDZE, Leila; GABELIA, Tsiala; SALUKVADZE, Eter. Influence of natural zeolites of Georgia on the migration of toxic elements in soil-plant system . In: Ecological and environmental chemistry - 2022. Ediția 7, R, Vol.1, 3-4 martie 2022, Chișinău. Chisinau: Centrul Editorial-Poligrafic al USM, 2022, p. 149. ISBN 978-9975-159-06-7..
|Ecological and environmental chemistry
Ediția 7, R, Vol.1, 2022
Conferința "Ecological and environmental chemistry 2022" |
7, Chișinău, Moldova, 3-4 martie 2022
Natural zeolites are widely used in the field of environmental protection. Nowadays, the environment is saturated with various pollutants, including such life-threatening elements as cesium, strontium, etc. These elements in significant quantities accumulate into the soil, pass to the plant, fall into a living organism and poison it. The purpose of this study is to identify the possibility of application of Georgian zeolites to reduce the migration of Sr+ and Cs++ cations in the soil-plant system and protect the environment. The objects of the study were selected Georgian natural zeolites, lomontite and scoleciite containing rocks. The sorption and ion exchange properties of these zeolites were studied. Ion exchange properties were studied under dynamic conditions; dynamic exchange capacities (DEC) were established in relation to Cs+ and Sr+ cations. They are important indicators and determine the prospect of natural zeolites application in agriculture. Dynamic capacities were established based on the number of absorbed and washed out cations.DEC of lomontite in relation to Cs+ and Sr++ cations are the same (2.8mg.eq/g); a higher selectivity with respect to Sr++ is noticed for scoleciite (3.2 mg/eq/g). The study of the ion exchange properties of lomontite made it possible to carry out laboratory vegetative experiments to determine the possibility of its application for removing cesium and strontium from soil that decrease in their migration in the soil-plant system. Soils, contaminated by 0.1 N aqueous solutions of cesium and strontium chlorides, were placed on special plates. Granulated, lomontite-containing rock was introduced into the soil in an amount of 10.20 and 30%. The tests on wheat were carried out in three replications. In the first period of a plant development (in the stem) amount of Cs+ and Sr++ cations were determined. As a result of the introduction of lomontite in amount of 10, 20 and 30% into the soil, 0.7, 0.5 and 0.2% of cesium and 0.6, 0.4 and 0.1 strontium were found in the stem respectively. According to the results, it can be assumed that the introduction of 10 to 30% lomontite into the soil as an additive reduces amount of both cesium and strontium in the soil and their migration in the soil-plant system and this affect becomes more noticeable with an increase of the amount of zeolite.