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 Table 8. Polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF) (pg/g dry weight) in bottom sediments. TCDD-equivalents (TEQ) (pgTEQ/g dry weight) calculated using toxic equivalency fac to rs (TEFs) o f the international (I-TEF) model (NATO/CCMS, 1988) are also presented. PCDD/PCDF Station number and sediment slice 1 2 3 6 7 8a 8b 9a 9b Kuets- Kuets- Kuets­ jarvi jarvi jarvi Skrukke- bukta Bjorn- vatn Ruske- bukta Tj^re- bukta Lake Lake Inari Inari Lake Stuora- javri Lake Stuora- javri 0-1 cm 0-1cm 0-1 cm 0-1 cm 0-1 cm 0-1 cm 15-18cm 0-1 cm 22-23cm 2,3,7,8-TCDD n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d. 1,2,3,7,8-PeCDD n.d. n.d. 0.42 n.d. n.d. n.d. n.d. n.d. n.d. 1,2,3,4,7,8-HxCDD n.d. n.d. 0.18 n.d. n.d. n.d. n.d. 0.51 n.d. 1,2,3,6,7,8- HxCDD n.d. n.d. 0.63 n.d. n.d. n.d. n.d. 0.97 n.d. 1,2,3,7,8,9- HxCDD n.d. n.d. n.d. n.d. n.d. n.d. n.d. 0.69 n.d. 1,2,3,4,6,7,8-HpCDD 4.65 5.88 4.18 9.30 4.34 8.40 0.42 6.44 0.56 OCDD 49.8 48.3 28.2 38.4 35.8 37.3 4.93 37.2 10.3 EPCDD 54.5 54.2 33.6 47.7 40.1 45.7 5.35 45.8 10.9 TEQ pcdd 0.096 0.11 0.36 0.13 0.079 0.12 0.009 0.32 0.016 2,3,7,8-TCDF 5.22 3.30 2.53 1.24 1.18 n.d. n.d. 0.27 n.d. 1,2,3,7,8-PeCDF 3.84 3.66 1.15 3.74 1.33 1.13 n.d. 0.56 n.d. 2,3,4,7,8-PeCDF 3.91 4.38 2.94 3.11 1.34 1.82 n.d. 0.81 n.d. 1,2,3,4,7,8-HxCDF 2.85 3.56 1.95 5.12 1.17 2.30 n.d. 1.44 n.d. 1,2,3,6,7,8- HxCDF 2.24 1.71 1.18 3.58 0.86 1.83 n.d. 0.90 n.d. 2,3,4,6,7,8-HxCDF 2.65 2.19 4.53 2.42 1.03 1.08 n.d. 0.79 n.d. 1,2,3,7,8,9-HxCDF n.d. n.d. 0.91 n.d. n.d. n.d. n.d. n.d. n.d. 1,2,3,4,6,7,8-HpCDF 28.4 18.7 9.18 5.34 6.18 6.80 0.18 5.22 0.24 1,2,3,4,7,8,9-HpCDF 1.88 1.16 0.89 2.40 n.d. 2.72 n.d. 0.46 n.d. OCDF 20.1 10.6 22.9 19.4 4.55 12.8 0.43 8.56 n.d. EPCDF 71.1 49.3 48.2 46.4 17.6 30.5 0.61 19.0 0.24 TEQ pcdf 3.77 3.66 2.76 3.07 1.23 1.60 0.002 0.84 0.002 EPCDD/F 126 104 81.8 94.1 57.7 76.2 5.96 64.8 11.1 t EQ pcdd / f 3.86 3.77 3.12 3.21 1.31 1.72 0.01 1.16 0.02 n.d. = no detected. The highest total PCDD/F concentrations (126 pg/g dw) were found in bottom sediment from Lake Kuetsjarvi (Station 1). However there were not significant differences between the levels measured in “unpolluted” sites (stations 8 and 9) and the sites downstream the smelters. On the other hand concentrations o f PCDD/F found in modern (surface) sediments from the reference lakes were much higher than those in deeper sediment core slices (Table 8 ). Rapport APN- 514.3665.01 23