MPC (maximum permissible concentration): mineral content - 1,000 mg/l

MPC (maximum permissible concentration): sulphates - 100 mg/l

In 2013–2014, hydrochemical observations along the longitudinal section were carried out at all controlled horizons (0.5, 25, 50, 100 m and at the bottom) in the water area of the lake. In 2012, they monitored only the 0.5 m mark. General hydrochemical characteristics of lake water in 2012–2015 are shown in the diagram and graphs above.

Since the observations during these years were conducted in June–November, there were certain fluctuations in water temperature (7,4^оС – 11,2^оС) and color (7.9–11). The pH values were within the 7.7–7.9 range, and the dissolved oxygen content was 10.5–11.2 mg/l.

An increased content of total mineralization was noted in 2014 in all lake basins – in the middle, southern and northern Baikal.

The maximum content of sulphate ions was in the southern Baikal. Overall, the concentration of sulphates in the lake is close to the long-term average value of 5.5 mg/l.

Source: a review of the status and pollution of environment in Russian Federation in 2015