PCBs Sediment Polychlorinated biphenyl Evaluation Congener Toxicity Enzyme induction Isomer Dredging Ecological effects
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RELATIVE POTENCIES OF INDIVIDUAL POLYCHLORINATED DIBENZO-p-DIOXIN, DIBENZOFURAN, AND BIPHENYL CONGENERS AND CONGENER MIXTURES BASED ON INDUCTION OF CYTOCHROME P4501A mRNA IN A RAINBOW TROUT GONADAL CELL LINE (RTG-2)
Cytochrome P450-catalyzed enzyme activity in cell culture was investigated as a bioassay for 2,3,7,8-tetrachlorodibenzop-dioxin (TCDD) equivalents in environmental mixtures of polychlorinated dibenzo-p-dioxin (PCDD), dibenzofuran (PCDF), and biphenyl (PCB) congeners. A problem with the use of enzyme induction is that certain congeners are unable to induce P4501A enzyme activity to the same maxi...
متن کاملHigh resolution gas chromatographic analysis of cytochrome P-448 inducing polychlorinated biphenyl congeners in hazardous waste.
Polychlorinated biphenyls (PCBs), which have been commercially manufactured since 1929, are complex mixtures of many congeners and several homologues. They have been used in a variety of industrial and non-industrial applications which has allowed large quantities to be released into the workplace and environment1-6. Based on a 198 1 estimate, as many as 17 million pounds of PCBs were entering ...
متن کاملStatistical method to evaluate the occurrence of PCB transformations in river sediments with application to Hudson River data.
Polychlorinated biphenyls (PCBs) were produced in the mid 1900s for industrial use. The term PCBs refers to 209 theoretically possible chlorinated compounds of the biphenyl molecule (congeners). The number and location of the chlorines govern both the environmental fate and toxicity of each congener. Changes in the distribution of congeners in river sediments can result from congener transforma...
متن کاملConcentrations and fluxes of salmon-derived polychlorinated biphenyls (PCBs) in lake sediments.
Fourteen sediment cores were collected from 10 lakes spanning a large gradient of sockeye salmon returns (0-40 000 spawners km(-2)) in Alaska and British Columbia in 1995-98 and 2002/03. The cores were analyzed for 210Pb to determine sedimentation rates and focusing factors. Polychlorinated biphenyl (PCBs) concentrations in the surface sediments (0-2 cm) were highly correlated with the number o...
متن کاملHeightened biological uptake of polybrominated diphenyl ethers relative to polychlorinated biphenyls near-source revealed by sediment and plankton profiles along a coastal transect in British Columbia.
Polychlorinated biphenyl (PCB) and polybrominated diphenyl ether (PBDE) concentrations and profiles in paired sediment-plankton samples were determined along a 500 km transect in coastal British Columbia, Canada. PCB and PBDE levels in sediment were both greater in the industrialized Strait of Georgia than in remote northern sites and exhibited parallel spatial trends. In plankton, recent-use P...
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تاریخ انتشار 2000