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Bioconcentration of superlipophilic persistent chemicals |
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| Authors: | Harald J Geyer Derek C G Muir Irene Scheunert Christian E W Steinberg Antonius A W Kettrup |
| Institution: | 1. GSF, Institute of Ecological Chemistry, Germany 2. GSF — Research Center for Environment and Health, Neuherberg, P.O. Box 1129, D-85758, Oberschlei?heim, Germany 3. Freshwater Institute, Canada Department of Fisheries and Oceans, 501 University Crescent, R3T 2N6, Winnipeg, Manitoba, Canada 4. GSF, Institute of Soil Ecology, Germany |
| Abstract: | According to present understanding, persistent superlipophilic chemicals — such as octachlorodibenzo-p-dioxin, octachlorodibenzofuran, Mirex etc — with log Kow > 6 and cross sections > 9.5 Å, bioconcentrate in aquatic organisms only little from ambient water. The most convincing argument against it is that in bioconcentration experiments with superlipophilic chemicals amounts applied exceeded water solubility by several orders of magnitude. This paper describes various methods for determining bioconcentration factors (BCF) of superlipophilic compounds. As exemplified with octachlorodibenzo-p-dioxin, BCF values evaluated by these methods match well with those calculated by QSARs for fish and mussels based on log Kow and water solubility. As expected, these BCF values exceed previous values by several orders of magnitude. For BCF evaluation of superlipophilic chemicals in aquatic organisms we recommend:
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