The article covers elaborating the conceptual framework of the development of ecological tourism. The work expounds the notion and principles of ecotourism adopted in accordance with international agreements, and evolves the criteria of an ecotourism offer. The proposed wording of the modern concept of ecotourism implies ecological educating the participants of ecotourism activities and local residents and is aimed at attaining the socioeconomic objectives on condition that the natural and cultural heritage is preserved for future generations. The national experience and the features of developing ecotourism in Belarus are analyzed, including the analysis of ecotourism in protected areas, agritourism, and greenways. The most significant socioeconomic aspects of the growth of ecological tourism are produced.

The article highlights the opportunities for the development of local lore and ecological tourism in the Kharkiv region. A brief description of the most significant historical and cultural monuments and objects of ecological tourism in the region is considered and given. Proposals for system planning and route selection algorithms are offered. The conditions for the construction of ecotourism routes have been determined. The structure of the system of selection of objects for inclusion in the plan of the ecotourism route is defined and presented in a graphic form. An algorithm for planning a tourist trip on an ecotourism route has been developed.

The influence of the main structure-forming oxides Li2O/Al2O3, SiO2/Al2O3 and H2O/Al2O3 on the physical, rheological and colloidal-chemical properties of lithium-containing alumosilicate suspensions xLi2O-Al2O3-nSiO2-mH2O in the system are presented for the first time. As a result of optimization, the optimal area of influence of variable factors was determined for the ratio of oxides Li2O/Al2O3 from 0.82 to 1.05 mol, SiO2/Al2O3 from 3.4 to 4.5 mol and H2O/Al2O3 from 19 to 21.5 mol, providing normative levels of properties of lithium-containing alumosilicate suspensions, namely: density from 1.4 to 1.521 g/cm3, process viscosity from 15 to 47 sec, pH from 11.15 to 11.34, surface tension from 51.4 to 60.4 mN/m, cosine of the substrate contact angle from 0, 57 to 0.91, work of adhesion forces from 97 to 116 mN/m, work of cohesion forces from 103 to 121 mN/m, work of wetting forces from 27 to 52 mN/m, wetting coefficient from 0.78 to 0.96, spreading coefficient from –5 to –20 mN/m. The data obtained will form the basis for the creation of protective materials of new generation that, in the event of emergencies, can provide both the protection of people and technological equipment, buildings and constructions.

The article covers an event that has been hidden for fifty years, namely the failure of a nuclear explosion at Kharkiv region. The possible ecological consequences of the mentioned event are analyzed. Data from different sources are compared for further planning of researches of an ecological condition of district. The basis for creating a system for studying the environmental consequences of a nuclear explosion at the time of its implementation and at present is provided. The basics of standard calculations of probable exposure of the population, which had to be carried out immediately after the explosion, are provided, and systemic recommendations for further environmental control in the designated area are offered.

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