Spatial distribution and bioaccumulation of polychlorinated naphthalenes (PCNs) in mussel and fish from the Gulf of Gdańsk, Baltic Sea Original Research Article Pages 93-104 Jerzy Falandysz, Lidia Strandberg, Per-Anders Bergqvist, Bo Strandberg, Christoff

Blue mussel, flounder, perch and lamprey from the Gulf of Gdańsk accumulate many tetra- through hepta-CNs. Highest concentrations in fishes and lamprey are PCN congeners such as nos. 42, 52, 60, 61 and 69, which do not have vicinal (adjacent) carbon atoms unsubstituted with chlorine (NVC-Cl PCNs) and seem to be relatively resistant in the marine environment. In mussel, chloronaphthalenes such as nos. 3840, 33/34/37, 2843 and 47 dominate, i.e. the congeners, which have two or three vicinal carbon atoms unsubstituted with chlorine (DVC-Cl and TVC-Cl PCNs). PCNs with two vicinal carbon atoms unsubstituted with chlorine (DVC-Cl PCNs) are less abundant in fish and lamprey than NVC-Cl members, while those congeners with three (TVC-Cl PCNs) or four (QVC-Cl PCNs) vicinal carbon atoms unsubstituted are present as only minor compounds or are absent. Congener-specific data obtained using a non-destructive sample extraction and clean-up method coupled to HRGC-HRMS can be useful to explain potential species- or site-specific differences of the pollution pattern with PCNs. Most of the hexa-CNs, both hepta-CNs and some penta- and tetra-CNs show their high potency for bioaccumulation in flounder when related to mussel as their food.