Food chain enrichment of organochlorine compounds and mercury in clean and polluted lakes of Finland |
| |
Authors: | Jaakko Passivirta Jukka Särkkä Kari Surma-Aho Tarmo Humppi Tauno Kuokkanen Markku Marttinen |
| |
Institution: | 1. Department of Chemistry, University of Jyväskylä, Kyllikinkatu 1-3, SF 40100 Jyväskylä 10, Finland;2. Department of Biology, University of Jyväskylä, Yliopistonkatu 9, SF 40100 Jyväskylä 10, Finland |
| |
Abstract: | Lakes polluted by pulp mill and urban wastes including chlorobleaching of pulp, semipolluted lakes and reference lakes in nearly natural condition in Central Finland were studied for contents of mercury, methyl mercury and organochlorine compounds in sediment, plankton, roach and pike. Chlorobleaching had caused a 30-fold concentration of Hg in bottom sediment related to that of the purest reference lake. This was not reflected to the mercury levels in fish which were highest at one natural condition (humic) lake and rather high also at semipolluted lake Päijänne. Mercury in fish was shown to be mostly methylated but not completely and its time trends could be estimated. Chloroform showed no but carbon tetrachloride, tetrachloroethylene and chlorinated cymenes significant bioaccumulation in fish. Levels of chlorophenols from bleaching had strongly decreased but pentachlorophenol and 2,3,4,6-tetrachlorphenol levels remained related to earlier results. Using fat basis attenuated the power of estimation of food chain enrichment by a three throphic level model for lipohilic biocides and a strong proof was obtained of the enrichment of hexachlorobenzene. The time trends at Päijänne were decreasing for mercury and DDE but increasing for PCB. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|