NEW PASSIVE SAMPLING SYSTEMS FOR MONITORING ORGANIC MICROPOLLUTANTS AND HEAVY METALS IN THE SHKODRALAKE

摘要

The determination of organic micropollutants and heavy metals in surface water is of ecotoxicological relevance due to their high toxic potential, their persistence and their tendency to bioaccumulate. New passive sampling devices for time-integrative monitoring of the dissolved and thus bioavailable fraction of these trace contaminants were tested in lake Shkodra. The membrane-enclosed silicone collector (MESCO II), applicable for more hydrophobic organic pollutants were deployed at 3 different stations of the lake Shkodra. After retrieval of the samplers, the silicone rods (collecting phase) were analysed by thermodesorption - GC/MS. The time-weighted average (TWA) water concentrations of organic micropollutants were calculated using laboratory-derived sampling rates (R). The inorganic variant of the Chemcatcher~® passive sampler was used to monitor heavy metal pollution at 3 different sites of the Shkodra lake. The extracts from the receiving phase of the exposed samplers were analysed for heavy metals using an AAS/ETA and ICP/MS methods. The water concentrations of Cd and Cu were calculated using the element-specific uptakes rates estimated for the prevailing field conditions.