The article presents the results of ecological and geochemical monitoring of the state of snow cover and ice selected on the territory of the Goloustnensky municipality, which includes the following localities: the village of Maloe Goloustnoe, the villages of Bolshoe Goloustnoe and Nizhny Kochergat. Studies were also conducted on the territory of the village of Bulunchuk, the bed of the Goloustnaya river and in the coastal part of the lake Baikal water area for the period 2016-2018. Sampling was carried out in the third decade of february-the first decade of march, before the active process of snowmelt. The study presents the results of chemical analysis of snow and ice. The main sources of snow cover and ice pollution in the territory under consideration have been identified. The following parameters were determined in melt water samples: pH, ionic composition, suspended solids, petroleum products, and heavy metals. The data obtained during the analysis were compared with the maximum permissible concentrations and regional background values for the indicators under consideration. It was found that the content of sulfates and chlorides in the snow cover and ice samples corresponds to the sanitary standards established for fishery reservoirs, but in samples taken near settlements and on the coastal part of the Baikal water area, the content of these substances exceeds the regional background values. In the snow cover in the vicinity of the settlements of Maloe and Bolshoe Goloustnoe, Bulunchuk, as well as in the waters of the Goloustnaya river and the coastal waters of lake Baikal, sanitary standards for the content of petroleum products, manganese, copper, lead and zinc were exceeded.

Yanchuk Maria Sergeevna, Junior Research Scientist, V. B. Sochava Institute of Geography SB RAS, Ulan-Batorskaya st., Irkutsk, 664033, Russian Federation, e-mail: m_s_yanchuk@mail.ru

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