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© Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Petroleum products are among the most widespread pollutants that affect human health and deteriorate the chemical and biological conditions in water bodies. The concentration of petroleum products should not exceed 100 μg/dm3in drinking water (SanPiN, 2018), and 50 μg/dm3 (Prikaz..., 2018) in fishery waters. The surface runoff, accumulations of petroleum products in the snow and ice, the East Siberian and Baikal Amur railways, emissions from ship engines, and natural oil seepages onto the water surface are the sources of pollution by petroleum products. Petroleum products were determined by the fluorimetric method. We have determined that the concentrations of petroleum products in the coastal water of Lake Baikal generally do not exceed maximum permissible concentrations (MPC) (<5-56μg/dm3). The water in Southern Baikal had higher concentrations of petroleum products than that in Central and Northern Baikal. Were corded the minimum concentration sin Central Baikal. At the same time, the concentrations of petroleum products in all basins on the east coast of the lake were higher than on the west coast (Table 1). Analysis of surface and near-bottom samples revealed that the concentrations of petroleum products in the surface layer were 1.2 times higher than in the nearbottom one. In an interannual aspect, the highest concentrations of petroleum products were recorded in May 2017. That year, the vessel was moving behind melting ice and, perhaps, pollutants that accumulated in ice and snow over the winter caused an increase in the concentration of petroleum products. In the spring of 2018 and 2019, the concentrations of petroleum products in the lake water were close. In the pelagic zone, we determined the elevated concentration of oil products in the southern basin in 2019 as well as in the northern and central basins in 2017 (Table 1). In May 2019, at the pier near the Kultuk settlement, there was anincreaseinconcentrations 1.1 times exceedingMPC. As a rule, high concentrations of petroleum products are recorded at sites with natural oil seepages to the water surface. Thus, near Gorevoy Utes Cape, the concentrations of petroleum products reached extreme values of 300-1200 μg/dm3. The concentrations of petroleum products in the large tributaries of Lake Baikal varied from < 5 to 78 μg/dm3 in the water of the Selenga River, from <5 to 18 μg/dm3in the Upper Angara River and from 2 to 26 μg/dm3inthe Barguzin River. Higher concentrations of petroleum products are typical of spring floods, which is associated with their influx from the watershed with melt water. Elevated concentrations of petroleum products are most often observed near settlements. In the lower course of the Selenga River and its delta channels, the concentrations of petroleum products were regularly 1.5-2 times higher than MPC for fishery waters. Nevertheless, the annual average concentrations of petroleum products in the Selenga water was lower from 2010 to 2019 than from 1984 to 1988 (40-260 μg/dm3). In the rivers of Southern Baikal (the Utulik, the Solzan, the Khara-Murin, the Snezhnaya, and the Pereyomnaya), snow supply and late spring floods predominated from April to June. The maximum values of petroleum products were recorded in May and July, which is due to their influx from snowmelt and the watershed during rainfall. The rivers show elevated concentrations of petroleum products in the underice period (Table 2), which may be due to the works

The concentrations of petroleum products in the waters of Lake Baikal and its tributaries during different seasons from 2010 to 2019