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(46-42) Dissolved organochlorine and PAH pollution profiles in Lithuanian and Swedish waters. Bergqvist, Per-Anders*,1, Jegorova, Ilona1,2, Zaliauskiene, Audrone2, 1 Umea University, Umea, Sweden, Sweden2 Kaunas University of Technology, Kaunas, Lithuania, Lithuania ABSTRACT- River water has the possibility to change pollutant concentration very rapidly depending on occasional releases and rain events. It is thus important to assess the time weighted average concentration of potentially toxic compounds in order to describe the exposure to organisms living in the watercourse. During this study we examined two Lithuanian rivers and two Swedish streams consisting mainly of storm water. Nemunas river in Lithuania were sampled with semipermeable membrane devices (SPMD) during 24 days in October 2000 thus allowing the calculation of time weighted average (TWA) values of dissolved concentrations of most of the analysed compounds. On the other hand, the Lithuanian river Neris were sampled with SPMD during 4 month in autumn 2000 and then only approximately half of the studied compounds could be used for TWA calculation The other reached steady state concentration during the sampling period. The Swedish streams were sampled above and below industrial activities as well as large parking lots. Key words: SPMD, river, monitoring, organochlorine pollutants |
