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The O.E.C.D. monitoring Wildlife Sampling and Analysis Programme 1973–1975 has been extended at national level in Finland to 1978 by analysing chlorinated hydrocarbon residues in fish at two marine and two freshwater environments and mercury at the latter two freshwater environments. Statistical treatment of the analysis results gave significant decreasing trends in most cases of PCB and DDT residues but in mercury levels no significant change was detected. 相似文献
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Jaakko Paasivirta Hannu Hakala Juha Knuutinen Terttu Otollinen Jukka Srkk Leena Welling Raija Paukku Reino Lammi 《Chemosphere》1990,21(12):1355-1370
Chlorohydrocarbons and free and chemically bound chlorophenols, catechols and guaiacols were measured from lake sediments in Central Finland. Chlorohydrocarbons occurred at low backround levels except chlorocymenes from pulp mills and PCBs near the city of Äänekoski, where a local leakage occurrs. Free chlorophenols (hexane extractables) were found in all 18 areas studied, but the bound ones (extracted with strong alkali) only in the pulp mill reciepient lakes where they dominated. Preliminary analyses of chemically bound chlorophenols in high molecular fractions of spent bleach liquors and pulp mill effluents indicated that majority of chlorocatechols and guaiacols are bound already in the factory. 相似文献
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Immobilization: A Revolution in Traditional Brewing 总被引:1,自引:0,他引:1
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Seija Sinkkonen Jaakko Paasivirta Jaana Koistinen Mirja Lahtiper Reino Lammi 《Chemosphere》1992,24(12):1755-1763
Polychlorinated dibenzothiophenes, PCDBTs, have been analysed with HRGC/HRMS from different bleached pulp mill effluents. 2,3,7,8-TeCDBT was found to be the dominating TeCDBT isomer in some samples. The estimated concentrations of the TeCDBTs in the samples were < 1 to 60 pg/L. PeCDBTs and other higher chlorinated PCDBTs were not found (< 1 pg/L). 相似文献
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Seija Sinkkonen Erkki Kolehmainen Jaakkko Paasivirta Jaana Koistinen Mirja Lahtipera Reino Lammi 《Chemosphere》1994,28(12):2049-2066
Seven effluent samples from a modern pulp mill, in which chlorine and chlorine dioxide bleaching is used, and five sediment samples from the recipient watercourse were investigated for polychlorinated dibenzothiophenes (PCDBTs), polychlorinated thianthrenes (PCTAs), polychlorinated diphenylsulfides (PCDPSs) and for alkylated derivatives of these. Mainly di-, tri-, tetra- and pentachlorinated congeners were studied. Particles and filtrates from the effluents were analyzed separately. The concentration levels of the nonalkylated compounds were found to be higher in the filtrates than in the particles. Trichlorinated dibenzothiophenes and thianthrenes were found as the major congeners. Pentachlorinated derivatives were not found. Alkylated di- and trichlorodibenzothiophenes were detected in some samples, while alkylated chlorinated thianthrenes and diphenylsulfides were nondetectable. The estimated concentration levels of the compounds detected were in the range of 40–2700 pg/L in the pulp mill effluents and in the range of 2–40 pg/g dry weight in the sediments. Mixtures of methylated di- and trichlorodibenzothiophenes used as references in analyses were prepared from methylchlorobiphenyls. Some new pure model compounds were obtained by HPLC fractionation of the chlorination mixture of dibenzothiophene. Structures of these were determined by 1H NMR. 相似文献
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The ability of HCB to interact with the
receptor was investigated
and
. HCB, up to 1.0 μM, was not a potent
competitor for the specific binding of [3H]-TCDD (0.3 nM) to rat hepatic cytosol. Administration of HCB (3000 ppm in the diet) to rats for up to 7 days resulted in a decrease in the specific binding of [3H]-TCDD to hepatic cytosol, as compared to pair-fed control rats. These results suggest that HCB may be able to interact, either directly or indirectly, with the hepatic
receptor
. 相似文献
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