| Annotation |
The work is devoted to the study of the indicator properties of the elemental composition of aquatic plants of the duckweed family (Lemnaceae). This plant family can act as an optimal geoindicator due to its wide distribution area, high rate of biomass growth and resistance to eco-geochemical environmental conditions. The carried out research touches upon one of the most pressing problems of geoecology and ecogeochemistry, the search for objective indicators of the state of the environment. The data are presented on the content of 28 chemical elements in duckweeds, determined using instrumental neutron activation analysis. Statistical indicators of the variability of chemical elements depending on the natural and man-made conditions of the regions of the Tomsk region have been studied. The object of the research isaquatic plants of the duckweed family (Lemnaceae). The purpose of the research is to determine changes in indicator indexes of the content and ratio of chemical elements in the composition of plants of the duckweed family, depending on the ecological and geochemical situation of the Tomsk regionterritory, formed as a result of the complex influence of natural and man-made environmental factors. Using geochemical approaches, the formation specifics of the elemental composition of aquatic plants depending on the geo-ecological situation of the region have been determined, indicator indexes of the rare earth and radioactive elements ratio have been identified in the areas where oil refining industry enterprises, the nuclear fuel cycle are located, as well as the presence of natural anomalies. It has been established that the La/Ce ratio in duckweeds of the Tomsk region varies within a narrow range from 0,2 to 0,6, the average value is 0,4. The value of the Th/U ratio varies over a wide range, from 0,02 to 154. In general, it has been shown that the elemental composition of aquatic plants of the duckweed family carries information about the current ecological and geochemical situation of the study area and can serve as an indicator of the environmentstate.
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