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Table. 6. Concentrations o f heavy metals and As (^g/g, dry weight) in sediment cores, values o f contamination factor (Cf) and degree o f contamination (Cd) of the Russian investigated lakes Lake, Date, Depth, m Layers Cu Ni Zn Co Cd Pb As Hg Cd Kochejaur-North 20.08.02 4 m 0 - 1 18 - 19 16 18 21 22 78 74 9.9 13.5 0.66 0.21 25.4 1.8 2.54 1.26 0.016 0.012 Cf 0.9 1.0 1.1 0.7 3.1 14.1 2.0 1.4 24.2 Kochejaur-Middle 20.08.02 8 m 0 - 1 16 - 17 16 16 19 19 71 85 7.8 7.7 0.54 0.21 21.8 5.1 2.60 1.13 0.018 0.017 Cf 1.0 1.0 0.8 1.0 2.5 4.3 2.3 1.1 14.0 Kochejaur-South 20.08.02 4 m 0 - 1 19 - 20 16 16 25 20 84 69 10.3 8.8 0.62 0.16 30.5 3.4 Cf 1.0 1.2 1.2 1.2 3.9 9.0 17.5 Virtuovoshjaur 21.08.02 11 m 0 - 1 16 - 17 23 18 25 19 56 83 9.0 11.6 0.30 0.12 26.9 5.5 2.33 1.21 0.083 0.003 Cf 1.3 1.4 0.7 0.8 2.5 4.9 1.9 29.1 42.5 Alla-Akkajarvi 28.08.02 28 m 0 - 1 26 - 27 112 12 321 12 95 103 23.0 9.0 0.36 0.09 28.2 3.3 3.83 1.86 0.134 0.028 Cf 9.4 27.0 0.9 2.5 4.2 8.6 2.1 4.8 59.5 Kuetsjarvi-Golfstream 14.08.03 23 m 0 - 1 15 - 16 981 47 2075 39 249 106 108.9 20.8 2.49 0.16 34.3 8.4 24.98 7.95 0.033 0.035 Cf 20.8 52.9 2.3 5.2 15.8 4.1 3.1 0.9 105.3 Kuetsjarvi-Kolosjoki 14.08.03 12 m 0 - 1 12 - 13 1496 373 2435 1087 229 99 129.3 42.8 1.80 0.35 45.7 4.5 39.18 11.06 0.142 0.017 Cf 4.0 2.2 2.3 3.0 5.2 10.1 3.5 8.1 38.5 Kuetsjarvi-Salmijarvi 14.08.03 10 m 0 - 1 20 - 21 1039 52 2814 66 297 127 150.4 30.7 2.44 0.18 38.6 9.2 86.66 11.92 0.031 0.007 Cf 20.0 42.8 2.3 4.9 13.2 4.2 7.3 4.7 99.5 Kuetsjarvi-Whit Stone 08.08.04 32 m 0 - 1 22 - 23 1343 40 4032 32 172 173 184.1 15.9 3.14 0.10 36.1 6.6 43.05 2.62 0.417 0.049 Cf 33.5 125.7 1.0 11.6 32.1 5.5 16.4 8.5 234.2 Kaskamajarvi 04.09.04 13 m 0 - 1 19 - 20 77 57 70 33 107 115 32.4 23.1 0.30 0.09 12.0 2.1 7.63 4.83 0.116 0.057 Cf 1.3 2.1 0.9 1.4 3.6 5.6 1.6 2.0 18.6 Porojarvi 24.08.04 11 m 0 - 1 22 - 23 131 68 173 42 110 161 27.8 11.8 0.50 0.20 6.2 2.9 38.20 13.69 0.215 0.058 Cf 1.9 4.1 0.7 2.4 2.6 2.1 2.8 3.7 20.2 Shuonijaur 25.08.04 5 m 0 - 1 14 - 15 100 14 117 13 63 47 7.8 4.3 0.47 0.06 12.1 0.8 2.03 0.74 0.040 0.019 Cf 7.3 9.3 1.3 1.8 8.5 14.9 2.7 2.1 48.0 23