In a greenhouse experiment, some features of Tritium migration from an aqueous feeding solution to white willow (Salix alba L.) habitat components and isotopic effects of hydrogen during the willow growth have been studied. A number of rate constants for tritiated water diffusion through pores, cell membranes and uptake through the root system (k = (8.44±0.03)•10-7 s-1); 3 H/ 1 H isotopic exchange in OH-groups of organic substances (k = 5.07•10-7); "isotopic lightening" during photosynthesis (k = 5.00•10-8) were calculated from the experimental data. The rate constant of tritium transfer through the root system to intercellular sap of plants is 2.17±1.45•10-6 s-1. The tritium distribution between the feeding solution and the intercellular sap has come to equilibrium within 1-2 weeks. The fractionation factor (α) is 0.88-0.94 and does not depend on the concentration of 3 H in the feeding solution. The rate constant of transformation of tritium into organically bound species is 8.6±3.0•10-7 s-1. The equilibrium has set from 4 to 11 weeks, α = 0.17-0.19 and does not depend on 3 H concentration in the feeding solution. At the same time, strong isotopic effect of "lightening" of the feeding solution, probably owing to transpiration, has been observed. The rate constant value of Tritium transpiration calculated from the experimental data is 2.67±0.27•10-8 s-1. The rate of tritium removal due to transpiration is proportional to its concentration in the feeding solution. The factor of tritium fractionation during transpiration is 1.35±0.08.

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The paper is devoted to the study of microelement composition of potable groundwater in Korostyshiv district of Zhytomyr region in terms of potential threats to human health. The study was conducted as part of general monitoring studies set of groundwater quality in the region in July 2020 – August 2021. Microelement analysis of water samples was performed by use of modern highly sensitive method of mass spectrometry with inductively coupled plasma (ICP-MS). The results obtained may be useful to justify the need to adjust the diet of local residents through the additional use of vitamin and mineral complexes.

The article considers the issue of groundwater influence on scarps and slopes stability. The relevance of the study is caused by the tendency to increase the frequency of appearance of exogenous geological processes due to technogenic impact. Timely detection of hazardous areas and application of measures to prevent the development of landslide processes will avoid significant damages. An important factor that directly affects forecasting is a reliable calculation of the stability and an adequate interpretation of the results, depending on the choice of the calculation method. Different methods of calculation, different complexity of their implementation and uncertainty of the results aggravate the problem, especially with regard to groundwater levels fluctuations and their further influence on sustainability parameters. The existing methods for calculating scarps and slopes stability, in particular taking into account temporary changes of groundwater levels, are analyzed. This study proves that the further increase in the reliability and accuracy of the results of calculations primarily depends on the improvement of methods for determining the water-physical state of soils and hydrodynamic features of groundwater movement. The authors provide evidence of the necessity to take into account intensity value of infiltration recharge at the predictive assessment of groundwater level. The role of anthropogenic component of infiltration recharge due to losses from water communications, especially in local areas, is investigated, which in the future will be reflected in engineering measures justification.

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