Polychlorinated dibenzo-p-dioxins

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polychlorinated dibenzo-p-dioxins (PCDDs), a group of related chemicals which are usually present in mixtures and usually as minor impurities among other chemicals such as PCBs, chlorophenols, phenoxy acid herbicides, hexachlorophene antiseptic etc. They are poorly water soluble and lipophilic (see PCDD/F - physicochemical properties), and therefore accumulate in lipids (fats) of living organisms (see PCDD/F - environmental persistence), and bioaccumulate in trophic levels (see PCDD/F - biomagnification). (For detailed information, see IARC Monographs on the Evaluation of Carcinogenic Risks to Humans, Volume 69, pp. 33-343, Lyon, 1997).