Sandimirov S. Pollution of the Sediments of the Paz River basin / In State of the environment in the Norwegian, Finnish and Russian border area. The Finnish Environment. Finland, Jyvaskyla: Kopijyva Oy. 2007, №6, 98p.

situated on the greater distance from the Pechenganickel smelters, the main polluting elements are Cd, Pb, Hg and As which on o f classification Hakanson have contamination factors from very high up to moderate. Table 2. Concentrations of heavy metals and As (^g/g, dry weight) in surface sediment layer (0 - 1 cm) o f the investigated Paz River parts Lake Cu Ni Zn Co Cd Pb As Hg Bjornevatn 234 397 256 54 0.35 10.3 17.3 0.039 Vaggatem 75 87 122 28 0.11 15.6 7.56 0.042 Ruskebukta 67 70 95 21 0.15 17.2 8.55 0.161 Skrukkenbukta 169 280 127 39 0.27 26.8 6.89 0.017 Hestefoss 32 37 81 19 0.18 .88. 4.45 0.143 Average 115 174 136 32 0.21 15.8 8.95 0.080 Minimum 32 37 81 19 0.11 .88. 4.45 0.017 Maximum 234 397 256 54 0.35 26.8 17.3 0.161 Standard deviation 83 157 70 14 0.10 7.1 4.91 0.066 Table 3. Concentrations o f heavy metals and As (^g/g, dry weight) in sediment cores, values of contamination factor (Cf) and degree o f contamination (Cd) o f the investigated Paz parts Lake, Date Depth, m Layers, cm Cu ^g/g Ni ^g/g /g Z g 3 o /g О ^ d /g о а д b /g P g s /g < ^ g /g Я ^ Cd Skrukkebukta 16.09.02 0 - 1 9 - 10 169 58 280 64 127 123 39 25 0.27 0.09 26.8 14.0 6.9 9.0 0.017 0.032 37 m Cf 2.9 4.3 1.0 1.6 3.0 1.9 0.8 0.5 16.1 Bjornevatn 16.06.02 0 - 1 15 - 16 234 42 397 58 256 100 54 27 0.35 0.11 10.3 11.2 17.3 3.4 0.039 0.003 23 m Cf 5.6 6.9 2.6 2.0 3.1 0.9 5.2 12.2 38.3 Vaggatem 11.09.02 0 - 1 14 - 15 75 55 87 58 122 126 28 30 0.11 0.08 15.6 9.2 7.6 6.0 0.042 0.015 19 m Cf 1.4 1.5 1.0 1.0 1.5 1.7 1.3 2.9 12.1 Ruskebukta 0 - 1 67 70 95 21 0.15 17.2 8.5 0.161 11.09.02 14 - 15 62 63 112 26 0.09 12.4 4.4 0.038 15 m Cf 1.1 1.1 0.8 0.8 1.7 1.4 2.0 4.2 13.1 Hestefoss 0 - 1 32 37 81 19 0.18 8.8 4.4 0.143 13.09.02 3 - 4 36 46 100 21 0.05 6.8 3.9 0.021 10.5 m Cf 0.9 0.8 0.8 0.9 3.9 1.3 1.1 6.8 16.5 Bjornevatn has maximum value o f degree o f contamination (Cd), which according to Hakanson (1980) classification is estimated as very high Cd (Table 3). Considerable and moderate values o f Cd are characterized for other distinct lakes. Skrukkebukta and Hestefoss situated down­ stream and upstream from the Bjornevatn respectively have the considerable Cd values, the first lake due to pollution by Ni, Cu and Cd, and the latter - Hg and Cd. 14