Species-specific elimination of polychlorinated biphenyls in estuarine animals and its impact on residue patterns
In: Marine Environmental Research. Applied Science Publishers: Barking. ISSN 0141-1136; e-ISSN 1879-0291, more
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| Keywords |
Biological phenomena > Accumulation > Bioaccumulation
Chemical compounds > Organic compounds > Hydrocarbons > Unsaturated hydrocarbons > Aromatic hydrocarbons > PCB
Chemical reactions > Degradation > Biodegradation
Elimination
Elimination
Nereis diversicolor Müller, 1776 [WoRMS]; Palaemon longirostris H. Milne Edwards, 1837 [WoRMS]; Platichthys flesus (Linnaeus, 1758) [WoRMS]
ANE, North Sea [Marine Regions]
Marine/Coastal |
| Author keywords |
organochlorine; PCB; bioaccumulation; biotransformation; elimination;half-life; Nereis diversicolor; Palaemon longirostris; Platichthysflesus; North Sea |
| Abstract |
Elimination kinetics of tetra-, penta- and hexachlorobiphenyls (IUPAC Nos. 44, 52, 87, 95, 101, 153) were investigated by laboratory experiments in three species of different phyla: Nereis diversicolor (Polychaeta), Palaemon longirostris (Crustacea) and Platichthys flesus (Pisces). Half-lives were species-specific and structure-dependent. Palaemon longirostris eliminated all components fastest. N. diversicolor was faster than Platichthys flesus except for components 95 and 153. Contrary to the fish species, the two invertebrates contained significant amounts of polar transformation products of No. 52, which had been applied as 14C labelled. Therefore, the faster elimination by Palaemon longirostris and N. diversicolor was assumed to be generally due to increased biotransformation. Elimination was in accordance with polychlorinated biphenyl (PCB) residue patterns obtained from field samples of the species. Congeners with vicinal H atoms in m,p positions were under-represented in Palaemon longirostris and so were congeners with > 7 Cl in N. diversicolor, while the PCB residue pattern in Platichthys flesus was similar to that of Clophen A60. By comparing percentages of the experimental congeners in PCB and their elimination half-lives in the three species, it was revealed that residue patterns were also influenced by species-dependent uptake, e.g. feeding habits. Extractable organic matter-based PCB levels increased with trophic levels of the three species. |
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