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 O 15 '+J _TO100 CD C£ 80 Pasvik River (stations No. 4 and 5) I ■ 1 ■ 1 1 1 NAP C1N ACL ACN FLN PHE ANT FLT PYR BAA CHR BF B b P BaP PER IND DBA BP Stuorajavri Lake (station No. 9) NAP C1N ACL ACN FLN PHE ANT FLT PYR BAA CHR BF ВѳР BaP PER IND DBA BP PAH analytes ro bс e о al le QZ Pasvik River (stations No. 6 and 7) - ■ - NAP C1N ACL ACN FLN PHE ANT FLT PYR BAA CHR BF BeP BaP PER IND DBA BP Inarijarvi Lake (station No. 8) I l l _ _______1 . NAP C1N ACL ACN FLN PHE ANT FLT PYR BAA CHR BF BeP BaP PER IND DBA BP PAH analytes 20 5 0 Figure 5. PAHprofiles found in sediment samples from different sampling areas in 2003-2005. Comparison o f PAH ratios calculated for sediment samples from Lake Kuetsjarvi and Paz watercourse showed that in sample from station 3 values o f three from five tested PAH ratios were higher compare with the other station investigated (Table 3). It can be confirmation of predominance o f anthropogenic input into PAH level formation in sediments from station 3. This is in agreement with the results from the Kola Ecogeochemistry project (Reimann et a l, 1995; 1997). During this study the highest concentrations o f PAHs were found in the vicinity o f Nikel. The results indicate that human sources are predominant. The PAH concentrations near Nikel were above the SFT threshold for areas for most sensitive use ((Vik et al., 1999) o f 2.0 ppm for Sum PAHs in soil (2.0 ppm)). The Norwegian Pollution Control Authorities (SFT) has not developed an environmental classification system for pollutants in freshwater sediments other than for heavy metals. However, there is a classification system made for marine sediments (Mo lv^ r et al. 1997) that sometimes also are used for freshwater sediments (Rognerud et al. 1997). The conditions in the lake are classified in 5 different categories by using the concentrations o f I P AH (minus perylene). Using this system the surface sediment from station 4 - 7, Lake Inari and Lake Stuorajavri are classified as “insignificantly contaminated (<300 ng/g dw)” or “moderately contaminated (300 - 2 000 ng/g dw)” o f PAHs. However, sediments from station 1 and 2 in Lake Kuetsjarvi are classified as “markedly contaminated (2 000 - 6 000 ng/g dw)” and station 3 as “ strongly contaminated (6 000 - 20 000 ng/g dw)” . The results from our study are comparable to the results found by Skotvold et al. (1997) who studies sediments from 24 different lakes in Northern Norway in 1994 - 1996. In this study the levels o f IPAH (minus perylene) in surface sediments from most lakes were less than 1 000 ng/g dw. The levels o f iPAH-perylene in surface sediments from 5 lakes in Sor-Varanger municipality varied from <400 - 800 ng/g dw. Rapport APN- 514.3665.01 13