Catalogue of Lakes in the Russian, Finnish and Norwegian Border Area = [Каталог озер в приграничном районе России, Финляндии и Норвегии] / Nikolay A. Kashulin, Vladimir A. Dauvalter, Sergey S. Sandimirov etc. - Apatity : Institute of the North Industrial Ecology Problems KSC RAS etc., 2008.

Table 4. The organic matter contents (LOI, %) and heavy metal concentra tions (pg/g, dry weight) in the surface (0-1 cm) and pre-industrial (20-21 cm) sediment layers. Cf and Cdare contamina tion factor and degree of contamination values, respectively. 3-4 cm of the lake sediments is the most severely polluted by these elements, which are toxic to hydrocoles (Fig. 4). The contamination factor values for these toxic elements range from 3.9 to 11.4 (Table 4), i.e. the values correspond to considerable and high pollution contamination. Pb has the highest Cf.value. The main source of Pb deposition from the atmosphere is the use of gasoline containing the anti-knock additive, tetraethyl-lead. The contamina tion value (51.6) for this lake corresponds to high contamination. Lake Layer, cm LOI Cu Ni Zn Co Cd Pb As Hg cd Kirikovanjarvi 0-1 20-21 20.01 20.56 202 32 183 26 120 88 34.6 8.8 1.00 0.09 18.0 1.6 4.71 0.85 0.214 0.040 c, 6.4 6.9 1.4 3.9 10.9 11.4 5.5 5.3 51.6 Fig. 4. Vertical distribution of the concentrations ofNi, Си, Cd and Hg (pg/g, dry weight) in the sediment core of Lake Kirikovan- jarvi. 1.4.3. Hydrobiological studies No direct hydrobiological investigations have been carried out in this lake. Despite the absence of ichthyological data, Lake Kirikovanjarvi is most likely populated by the same freshwater fish species present in the other studied lakes. 1.5. LAKE KJANTEJARVI Lake Kjantejarvi (watershed of the Barents Sea) is located 2 km to the north of the settlement of Liinakhamari, and is a source of drinking water for the local inhabitants. The road to Nemetskaya Bay on the Barents Sea runs along the edge of the lake. It is a small (area of the lake 0.36 km2), shallow-water (maximum depth 15.5 m) lake of gla cial origin with an indented shoreline. The maximum length is 1.2 km, and maximum width 1.1 km. The point of maximum depth (15.5 m) is located in the central part of the lake. According to the landscape type, the watershed area belongs to the tundra zone with heights of up to 380.6 m (Iso-Kiventunturi fell). The lake shores are high and rocky, and the water in the lake is colourless. Boulder beds occur in almost all parts of the littoral zone. The gaps between the boulders are filled with pebbles. 22 Catalogue o f Lakes in the Russian, Finnish and Norwegian BorderArea