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

Ctvalue. Contamination factor values for the other heavy metals are moderate. The de­ gree of contamination value (36.0) for this lake corresponds to high contamination. Lake Layer, cm LOI Cu Ni Zn Co Cd Pb As Hg cd Isalombola 0-1 29.13 71 28 109 8.3 0.35 21.6 4.56 0.188 22-23 23.81 80 13 93 6.7 0.08 1.1 1.02 0.090 c, 0.9 2.1 1.2 1.2 4.2 19.9 4.5 2.1 36.0 2.7.3. Hydrobiology investigations No direct hydrobiological investigations 1 2.8. LAKE KOBBHOLMVATN Lake Kobbholmvatn (watershed of the River Kobbholmselva) is located 34 km to the north of the town of Zapolyarny. The lake is relatively large (area of the lake 4.0 km2), deep (maximum depth 43 m), has an indented shoreline and is of glacial origin. The maximum length is 4.15 km and maximum width 2.47 km. The points of maximum depth are locat­ ed in the central part of the lake. The lake forms part of a lake-river system. According to the landscape type, the watershed belongs to the tundra zone, with heights of up to 396 m. Boulder zone. The lake shores are high, and covera of the lake is colourless. been carried out in this lake. Physico-geographical characteristics Watershed River Kobbholmselva— the Barents Sea Latitude 69°43.294' Longitude 30°40.899' Height above sea level, m 114.0 Maximum length, km 4.15 Maximum width, km 2.47 Maximum depth, m 43 Area, km 2 4.0 Watershed area, km 2 25.1 Study period 2003-2005 beds occur in almost all parts o f the littoral i by grass and shrub vegetation. The water Table 31. The organic matter con­ tents (LOI, %) and heavy metal concentrations (цд/д, dry weight) in the surface (0-1 cm) and pre-industrial (22-23 cm) sediment layers. Cf and Cjare the contamina­ tion factor and degree of contamination values, respectively. Fig. 46. Vertical distribution of the concentrations ofPb, As, Cd and Hg (цд/д, dry weight) in the sediment core of Lake Isalombola. Catalogue o f Lakes in the Russian, Finnish and Norwegian Border Area 91