Ecological and geochemical features of mercury load on the territory of south of Western Siberia

Relevance. The need to study contribution of biogenic factors to migration of elements and response of ecological and geochemical system to natural and technogenic situation, which makes it possible to identify the presence of biogeochemical anomalies. Aim. To determine ecological and geochemical features of mercury load in the south of Western Siberia (Tomsk region, Kemerovo region, Altai Territory) according to research (leaves of aspen (Populus tremula L., family Salicaceae)). Objects. Aspen leaves, widely used to analyze the biogeochemical cycle of chemical elements and their migration in the "soil–plant" system, reflect the elemental composition of growing environment and can act as a biogeoindicator for biogeochemical studies. Methods. Sampling of aspen leaves, drying at room temperature, grinding, atomic absorption analysis of mercury on an RA-915M analyzer with the PIRO-915+ attachment (pyrolysis method). The application program STATISTICA 12 was used to process the data analysis and calculate eco-geochemical indicators: concentration factor, enrichment factor, bioaccumulation factor, concentration clarke. Results. The article presents original data on Hg gross concentration in aspen leaves in Tomsk, Kemerovo regions and Altai Territory. The authors have revealed the features of pollutant accumulation depending on the area of growth, geography and orography of the territory, geochemical features of the study areas, and the influence of anthropogenic factors. Calculations of the main geo-environmental indicators of the mercury load were made. The calculation results indicate that the concentrations are higher than the background, the Clarke of the noosphere, and the average for the dry matter of terrestrial plants. The presence of the element in the form available to plants was revealed in the substrate, as evidenced by the results of calculating the bioaccumulation coefficient. Geographically, Hg accumulation in aspen leaves in the south of Western Siberia is associated with the prevailing wind direction and the impact of anthropogenic sources

Statistical parameters in assessing ecological and geochemical state of the Kolpashevo-Turukhan mineragenic zone eastern part

The relevance. The required statistical identification of natural and anthropogenic biogeochemical anomalies when conducting ecological and geochemical studies on the territories of buried exogenous ores with a weak anthropogenic pressure. The difficulty of their identification according to their sources is related to a similar litho-siderophilic geochemical specialization of sedimentary rocks of iron ore, titanium-zirconium formations and modern soils of taiga zone landscapes. Moreover, the research implemented a method for biomaterial sample preparation. This method is aimed at obtaining the possibility of using a biomaterial sample as a natural indicator to reveal the aeolian and dust aerosol substance intake. As a result, there is an urgent need to involve steps in biogeochemical data statistical processing that allows one qualitatively differentiate the effects of chemical elements concentration via root nutrition and dust accumulation on the leaves. The aim. Statistical assessment of content variability and relationships of chemical elements in aspen leaves in the zone of anthropogenic influence of transport roads crossing the localization areas of buried iron ore deposits of the Bakcharsko-Kolpashevo ore district, Kolpashevo-Turukhan mineragenic zone. Qualitative biogeochemical identification of biomaterial enrichment through root and dust in areas of anomalous concentration of chemical elements using data on accumulation of rare earth elements. Objects. Soil, leaves of common aspen (Populus tremula L., 1753). Methods. Regional biogeochemical and lithochemical sampling was carried out in three profiles along local roads with asphalt and unpaved surfaces at the entrances to settlements. The sampling points common for the methods were shifted off the roads at a distance of at least 20 m to undisturbed landscapes. After sample preparation, the concentration of 28 chemical elements in the samples was determined by instrumental neutron activation analysis. The interpretation of geochemical data was based on the results of multicomponent statistical analysis. Results. The studied territories along the lines of regional research are characterized by the background biogeochemical and lithochemical values. The revealed biogeochemical anomaly is caused by a dust halo that accompanies the unpaved road. The rare earth elements levels show the influence of fine dust-aerosol and aeolian material intake