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 9. Toxicity equivalency fac to rs proposed fo r selected PAHs showed dioxin-like activity PAHs TEF pah Willet et al., 1997 Clemons et al.,1998 Klimm et al., 1999 Anthracene 0.00010 Benzo[a]pyrene 0.000354 0.00001 0.000300 Dibenzo[a,h]anthracene 0.002030 0.05000 0.000078 Benzo[a]anthracene 0.000025 0.00001 0.000027 Benzo[k]fluoranthene 0.004780 0.05000 0.000290 Benzo[b]fluoranthene 0.002530 0.000380 Chrysene 0.000200 0.01000 Indeno[1,2,3-cd]pyrene 0.001100 0.000086 The results o f the TEQPA h calculated for PAHs found in Northwest Mediterranean sediment samples using different TEFs proposed considerably differed (Eljarrat et al., 2001). The lowest TEQ pah values were obtained, applying TEFs proposed by Klimm et al. (1997), followed by those using TEFs assigned by Willet et al. (1997), and finally, the highest values were obtained, employing TEFs proposed by Clemons et al. (1998). Multiplying the concentrations o f PCDD/F and dioxin-like PCB congeners by the corresponing TEFs (NATO/CCMS, 1988; Ahlborg et al., 1994) and further also the concentrations o f selected PAH analytes by TEFpah proposed by Klimm et al. (1999) allowed calculations o f total TEQ for mixture o f these contaminants in sediment (Tables 2 and 3). Table 10 shows that contributions of PAHs in total TEQ (TEQpah) in all sediment samples make 83-99% and greatly exceed sum of TEQpcdd/f and TEQpcb, even though the lowest values o f TEFpah were used for calculation. Table 10. Total 2,3,7,8-TCDD-equivalents (total TEQ) (pgTEQ/g dry weight) calculatedfo r a mixture ofPCDD /F , PCBs and PAHs fo u n d in bottom sediment samples. TEQs _______________________ Station number and sediment slice 1 2 3 6 7 4 5 8a 8b 9a 9b Kuets- Kuets- Kuets­ jarvi jarvi jarvi Skrukke- bukta Bjorn- vatn Ruske- bukta Tj^re- bukta Lake Inari Lake Inari Lake Stuora- javri Lake Stuora- javri 0-1 cm 0-1cm 0-1 cm 0-1 cm 0-1 cm 0-1 cm 0-1 cm 0-1 cm 15-18cm 0-1 cm 22-23cm TEQ p CDD/F 3.9 3.8 3.1 3.2 1.3 n.a. n.a. 1.7 0.01 1.2 0.02 t EQ pcb 0.43 0.51 1.4 0.23 0.14 0.67 0.81 0.86 0.43 0.35 0.07 t EQ pah 183.9 164.2 672.6 34.6 36.6 7.8 6.6 33.2 2.2 38.0 1.2 Total TEQ 188.3 168.5 677.1 38.0 38.0 8.5 7.4 35.8 2.6 39.6 1.3 n.a.=not analysed. Rapport APN- 514.3665.01 26