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 2015-2016 is given on the chart and graphs above.

General hydro-chemical characteristic of the lake water in 2015-2016 is given on the chart and graphs above. Since the observations during these years were conducted in June – October – November, there were certain fluctuations of water temperature (2015: 7.40 – 11.20 °С and 2016: 7.00 – 9.10) and water colour index (2015: 7.9 – 11.0 and 2016: 5.6 – 11.2). The pH values remained within the range between 7.7 and 7.9 units and the content of oxygen dissolved in the water was between 10.5 – 11.2 mg/l.

In 2016 general mineral content of the lake water increased in the middle and northern Baikal, while in southern Baikal it remained at the level of 2015.

In 2016, unlike in any of the previous years, an increased content of sulphate ions in all basins of Lake Baikal was registered. The maximum concentrations of sulphate were recorded in June in the middle Baikal.