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(38-11) Bioaccumulation of PCDD/Fs and PCDEs in two aquatic invertebrates and SPMDs. Lyytikäinen, Merja*,1, Rantalainen, Anna-Lea2, Mikkelsson, Pirjo3, Hämäläinen, Heikki4, Paasivirta, Jaakko3, Kukkonen, Jussi1, 1 University of Joensuu, Joensuu, Finland2 University of Helsinki, Lahti, Finland3 University of Jyväskylä, Jyväskylä, Finland4 Karelian Institute, Joensuu, Finland ABSTRACT- Concentrations of polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) and −ethers (PCDEs) were determined in Lumbriculus variegatus tissue and semipermeable membrane devices (SPMDs) after 28-d laboratory exposure with nine naturally contaminated sediments. Laboratory results were compared to the concentrations analyzed in tissues of chironomids collected in the field in the congruent places. Total concentrations of the toxicants were in general comparable in L. variegatus and chironomids but an order of magnitude lower in SPMDs. For total PCDE tissue concentrations, a linear correlation (r2>0.43) was found among the test organisms (including SPMDs). For total PCDD/Fs the correlation was linear for lower tissue concentrations (< 300 ng/g lipids). The congener specific concentrations of PCDD/Fs in SPMDs were found to correlate to the ones of the living organisms (r2 = 0.78 and 0.48 for L. variegatus and chironomids, respectively). However, for individual PCDE congeners such correlation was not observed. Concentrations of both PCDD/Fs and PCDEs in L. variegatus and chironomids showed slight correlation (when excluding the octachlorinated congeners r2 = 0.55 and 0.44, respectively). Our results indicate that even though there are many factors controlling the bioaccumulation (eg. chemical/congener characteristics, organism behavior), also some general trends can be found. Key words: PCDD/F, PCDE, bioaccumulation, sediment |
