Dioxins, Furans, and PCBs:Structural Similarities

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Cl

Cl

Cl

2,3,7,8-Tetrachlorodibenzo-p-dioxin

Cl

Cl

Cl

Cl

2,3,7,8-Tetrachlorodibenzofuran

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Cl

Cl

Cl

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Cl

3,3',4,4',5,5'-Hexachlorobiphenyl

Polychlorinated dibenzopara-dioxins

75 congeners /

7 considered toxic

PCBs

209 congeners / 13 considered “dioxin-like”

Polychlorinated

dibenzofurans

135 congeners /

10 considered toxic

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