Sandimirov S. Screening studies of POP levels in bottom sediments from selected lakes in the Paz watercourse / In State of the environment in the Norwegian, Finnish and Russian border area. The Finnish Environment. Finland, Jyvaskyla: Kopijyva Oy. 2007, №6.

Screening studies of PO P levels in bottom sediments from selected lakes in the Paz watercourse Station number and sediment slice PCBs 1 2 3 6 7 4 5 8a 8b 9a 9b #187 n.d. n.d. n.d. n.d. n.d. 0.23 0.41 n.d. n.d. n.d. n.d. #188 n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. #189 n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. #191 n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. #194 n.d. n.d. n.d. n.d. n.d. 0.01 0.03 n.d. n.d. n.d. n.d. #199 n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. #201 n.d. n.d. n.d. n.d. n.d. 1.38 1.62 n.d. n.d. n.d. n.d. #202 n.d. n.d. n.d. n.d. n.d. 0.27 0.41 n.d. n.d. n.d. n.d. #205 n.d. n.d. n.d. n.d. n.d. 0.02 0.03 n.d. n.d. n.d. n.d. #206 n.d. n.d. n.d. n.d. n.d. 0.01 0.02 n.d. n.d. n.d. n.d. #208 n.d. n.d. n.d. n.d. n.d. 0.12 0.15 n.d. n.d. n.d. n.d. #209 n.d. n.d. n.d. n.d. n.d. 0.02 0.02 n.d. n.d. n.d. n.d. :E(n,m-o)PCB 4.27 4.71 11.5 2.33 1.36 2.63 3.17 8.11 2.10 2.40 0.69 2EPCB 22.5 29.6 36.4 12.2 10.5 12.7 15.2 28.8 8.2 8.6 4.7 te Q pcb 0.427 0.507 1.374 0.230 0.136 0.670 0.809 0.855 0.430 0.352 0.069 n.d.=not detected. 1E(n,m-o)PCB is sum of non-ortho and mono-ortho CBs; 2EPCB is sum of 64 PCB congeners. Concentration in sediments ng/g dry weight £PCB £ (non-, and mono-ortho CBs) Figure 7. Polychlorinated biphenyls (ng/g dry weight) in surface (0-1 cm) bottom sediments. Numbers above bars represents total PCB concentrations (LPCB). The levels o f I 64PCB in the Paz watercourse varied from10.5 to 36.4 ng/g dw. The highest PCB levels were detected in the bottom sediments from Lake Kuetsjarvi (36.4 ng/g dw, Table 5). There was a tendency o f decreasing PCB levels (including non-ortho and mono-ortho substituted PCB congeners) with increasing distance from the smelter (Figure 7 ). However, a high PCB concentration (28.8 ng/g dw) was also found in the surface sediment sample from Lake Inari (3.9 times higher than in the deeper sediment core slice). The PCB-pattern in sediment from the two Rapport APN- 514.3665.01 18