DOI: http://dx.doi.org/10.1065/jss2001.04.009 - - - Eleven sediment samples from the lower Kymijoki River were analyzed for the occurrence of polychlorinated and polymethylated dibenzothiophenes (PCDT and PMeDTs). The area was heavily polluted by wastes from a pulp chlorobleachery and by leakage from a factory producing wood preservative chlorophenol formulation Ky-5. Levels in the sediments were from smaller than 5 to 400, 200 and 50 pg g-1 dw for tetra, penta and hexa-CDT, respectively. The concentrations of mono, di, tri and tetra-MeDTs were in the range of 1-5, 5-85, 5-500 and 15-2300 ng g-1 dw, respectively. PCDT contents in surface sediment (0-3 cm layers) decreased by distance downstream from the bleachery and Ky-5 factory similar to those of the bound polychloroguaiacols (PCG) and polychlorinated dibenzofurans (PCDF). In contrast, PMeDT contents showed a steep increase by distance with a maximum at 32 km downstream. |
