Serie: NILU rapport 36/2018
In the project there were monitoring of mercury (Hg) in air at one station and sampling and analysis of Hg in precipitation at two stations as well as analysis of Hg in 14 fish from the Pasvik water course. The monitoring results for Hg in air in Karpdalen show background levels around 1,3 - 1,4 ng/m3. Enhanced concentrations of Hg correspond to enhanced concentrations of SO2 (episodes). It is therefore likely that there exist a small local source of Hg in the border areas co-located with the sources of SO2. Concentrations and deposition of Hg in precipitation are higher at Svanvik than in Karpdalen, but lower than background stations in Southern Norway. Analysis of Hg in fish meat show that the largest fish (pike, trout, perch) have concentrations higher than the threshold value of 0,5 mg/kg. White fish showed low values.