Isomer-Specific Analysis and Toxic Evaluation of Polychlorinated Biphenyls in Striped Dolphins Affected by an Epizootic in the Western Mediterranean Sea (original) (raw)

1993, Archives of Environmental Contamination and Toxicology

Abstract

Isomer-specific concentrations of polychlorinated biphenyls (PCBs) including planar, mono-and di-ortho congeners and concentrations of DDT were determined in striped dolphins affected by a morbiUivirus epizootic in the western Mediterranean in 1990. Extremely high concentrations of PCBs ranging from 94 to 670 Ixg/g (wet wt) were detected in the blubber. Similarly, DDT concentrations were high, between 22 and 230 ixg/g (wet wt). The concentrations of three non-ortho coplanar PCBs were 43 (3,3',4,4'-T4CB), 6.8 (3,3',4,4',5-PsCB), and 7.8 (3,3',4,4',5,5'-H6CB) ng/g (wet wt), respectively, the highest residue levels reported to date. The estimated 2,3,7,8-TCDD toxic equivalents of non-, mono-and di-ortho PCB congeners in striped dolphins were several times higher than those observed for other marine mammals and humans. Mono-ortho congeners contributed greater 2,3,7,8-TCDD toxic equivalents than non-ortho members. The higher ratio of

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