The hydro-chemical observations along the longitudinal section of the water area of the lake were performed on all monitored levels (0.5, 25, 50, 100 metres and near-bottom water). General hydro-chemical characteristic of the lake water in 2018 is given on the chart and graphs above.

General hydro-chemical characteristic of the lake water in 2015-2017 is given on the chart and graphs above. Since the observations during these years were conducted in June – October, there were certain fluctuations of water temperature and water colour index. The pH values remained within the range between 7.6 and 7.8 units and the content of oxygen dissolved in the water was between 11.0 – 11.7 mg/l.

In comparison with 2017, in 2018, the total water mineralization decreased in the Northern and middle Baikal and increased in the southern one.

During the observation period 2014-2018, the maximum concentrations (7.3-9.2 mg / l) of sulfates were recorded in the average Baikal in 2016. in 2018, there was an increase in the content of sulfate ions in all the basins of the lake. Baikal almost reached the level of 2016; in southern Baikal, the concentration of sulfates varied between 5.3 – 7.3 mg/l.

In 2016 and less frequently in 2018, a series of earthquakes were recorded in the Baikal region (February 7, March 18, August 29, from October 26 to November 1 and December 6, 2016 and March 2018), which caused increased concentrations of sulfate ions and General mineralization in the lake. Baikal.