J. Falandysz et al., CONCENTRATIONS AND SPATIAL-DISTRIBUTION OF CHLORDANES AND SOME OTHER CYCLODIENE PESTICIDES IN BALTIC PLANKTON, Science of the total environment, 215(3), 1998, pp. 253-258
Twelve chlordane (CHLs) components and their metabolites (heptachlor,
heptachlor epoxide, U82, MC4, trans-chlordane, MC5, cis-chlordane, MC7
, oxychlordane, MC6, trans- and cis-nonachlor) and aldrin, dieldrin, e
ndrin, isodrin, endosulfan 1, endosulfan 2, and mirex were quantified
in mixed subsurface phyto-and zooplankton collected at four spatially
distant sites in the southern part of the Baltic Sea. The CHLs concent
rations in plankton were low, i.e. 5.3, 8.7, 9.2 and 8.7 ng/g lipid in
Gdansk Depth, Gotland Basin, Bornholm Basin and Pomeranian Bay, respe
ctively. Chlordane compounds showed similar distributions and patterns
in plankton at all four sampling sites. The trans-nonachlor to cis-ch
lordane ratio (N:C ratio) in plankton was between 0.76 and 1.0 which c
learly indicates pollution from distant sources due to long-range aeri
al transport. The relatively high concentrations of heptachlor epoxide
seem to be related to local sources of pollution around of the Baltic
Sea. Dieldrin was the major cyclodiene pesticide quantified and its c
oncentration was uniformly distributed in the plankton sampled and ran
ged from 23 to 42 ng/g lipid, while aldrin, endrin, isodrin, endosulfa
n 1, endosulfan 2 and mirex were undetected. (C) 1998 Elsevier Science
B.V.