Polychlorinated diphenylethers (PCDEs), sometimes called chlorinated diphenyloxides, have a structure that resembles that of polychlorinated biphenyls (PCBs) (Fig 1.). The difference is the oxygen atom that connects the two phenyl rings and which is absent in the PCB structure. Although the numbering system of the PCDEs is identical to that of PCBs, the two compound classes are essentially different. Their widespread occurrence in the environment is mainly the result of their presence as impurities in chlorophenol preparations (Becker et al. 1991). The presence of PCDEs next to polychlorinated dibenzo-pdioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in commercially available chlorophenols of technical and analytical grade has been confirmed by infrared spectrometry and mass spectrometry (Becker et al. 1991).
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- Polychlorinated Diphenylethers: Origin, Analysis, Distribution, and Toxicity in the Marine Environment
J. de Boer
- Springer New York
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