Sandimirov S.S. Catalogue of lakes in the Russian, Finnish and Norwegian Border Area. Finland, Jyvaskyla: Kopijyva Oy, 2008.

Table 5. The organic matter contents (LOI, % ) and heavy metal concentra­ tions (pg/g, dry weight) in the surface (О-1cm) and pre-industrial (15-16 cm) sediment layers. Cf and Cdare contamina­ tion factor and degree of contamination values, respectively. 1.5.2. Lake bottom sediments The sediments of Lake Kjantejarvi are characterized by relatively low organic matter contents: the LOI value in the uppermost 1 cm layer is less than 20 % (Table 5). The lake is located at a dis­ tance of 33 km from the “Pechenganikel” smelter, and is exposed to the impacts of atmospheric pollution originating from the smelter. This is reflected as an increase in the concentrations of heavy metals (e.g. Ni and Co), and chalcophile elements (mainly Cd, Pb and Hg).The contamination factor values for these elements range from 2.0 to 6.4 (Table 5), i.e. the values correspond to moderate and considerable contamination. Co has the largest Cfvalue. The degree of contamination value (20.5) for this lake corresponds to considerable contamination. Lake Layer, cm LOI Cu Ni Zn Co Cd Pb As Hg cd Kjantejarvi 0-1 15-16 18.59 15.37 112 89 159 54 218 233 364.5 56.8 0.78 0.40 46.7 13.2 6.18 4.53 0.153 0.072 cf 1.3 2.9 0.9 6.4 2.0 3.5 1.4 2.1 20.5 1.5.3. Hydrobiological studies No direct hydrobiological investigations have been carried out in this lake. Despite the absence of ichthyologic data, this lake is a typical salmonid (trout and arctic char) water body. 1.6. LAKE LN -2 Lake LN-2 (watershed of the River Kolosjoki) is located 6 km to the east of the town of Nikel. It is a small (the area of the lake is 0.11 km2), shallow-water (maximum depth 6 m) elongated oval lake of glacial origin. The maximum length is 0.6 km, and maximum width 0.3 km. The point of maximum depth (6 m) is located in the central part of the lake. According to the landscape type, the watershed area represents a combination of flat, low-lying areas of glaciolacustrine flatlands, with a height of up to 482 m. The shores of the lake are not high and are covered by peatland. The southern shore is wa­ terlogged, with a cover of dwarf arctic birch and dwarf shrubs. The water of the lake is colourless but, during periods of high precipitation in the summer, the colour ofwater increases slightly. Boulder beds are common in almost all parts of the littoral zone, and extend down to a depth of about 2-2.5 m.The gaps between the boulders are filled with silt. Си, мд/і 37 2.2-5.2 9.2 Ni, цд/І 8.6-9.8 23 Al, цд/І 21-26 0.20 Pb, |jg/l 0.19-0.21 24 Catalogue o f Lakes in the Russian, Finnish and Norwegian BorderArea