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Based on the potentiometric measurements average fluorine concentrations for different phases of the hydrological regime were determined in water samples taken in 2018-2020 in the outlet of the Ob River: 0,103 mg/L in the winter low-water period, 0,079 mg/L in the spring - summer flood, and 0,095 mg/L in the summer - autumn low-water period. The present-day weighted average concentration of fluorine in the Ob River water (0,086 mg/L) closely corresponds to the values measured in 1954-1956 and 1976-1980 (0,090 and 0,084 mg/L, respectively), therefore the fluorine content of 0,08-0,09 mg/L could be taken as a natural background.

New data on the fluorine content in North Atlantic waters was obtained by the method of direct potenti-ometry with a fluoride ion-selective electrode. The measured fluorine concentration was equal to 1,27 0,03 mg/kg at F/Cl mass ratio of (6,59 0,11) · 10-5, which closely corresponds to the normal fluorine content in seawater. The totality of available data on the F/Cl ratio in different areas of the World Ocean suggests rather low variability of the fluorine content in seawater salts.