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 Figure 4. Polycyclic aromatic hydrocarbons (mg/kg dry weight) in surface (0-1 cm) bottom sediments. Number above bars are values o f total PAH (perylene excluded) and perylene concentrations. The highest EPAH-perylene concentrations (2.1 - 12.9 mg/kg dry weight) were found in sediment samples collected in Lake Kuetsjarvi (stations 1-3) close to the N ikel’s smelter (Figure 4 ). Pyrogenic PAHs (fluoranthene, pyrene and benzofluoranthenes) prevailed in PAH composition (Figure 5). North off the smelter area (stations 6 and 7) the EPAH-perylene concentration was lower than those found in samples from Kuetsjarvi Lake. Concentrations of total PAH-perylene (EPAH-perylene, Figure 4) found in surface sediment samples from stations 6 and 7 (0.62-0.56 mg/kg dw) did not differ from those found in sediments collected in Lake Stuorajavri (0.62 mg/kg dw). However, it should be noted that PAH-perylene concentrations in surface (modern) sediments (0-1 cm slice) from Stuorajavri Lake were 4 times higher than those found in deeper sediments (15-18 cm, pre industrialized time). Relatively low PAH concentrations were found both in Tj^rebukta and Ruskebukta (stations 4 and 5) and in Lake Inari (station 8); EPAH-Perylene concentrations measured in sediments from these sites varied from 0.18 to 0.38 mg/kg dw (Table 3). For both Lake Stuorajavri and Lake Inari, the PAH- perylene concentration found in the deeper slice o f the core sample was lower than those in modern (surface) bottom sediments (Table 3). The level o f perylene in Lake Stuorajavri was high and it is probably due to peat and bogs in the catchment area. Rapport APN- 514.3665.01 12