properties of dioxins and firans toxicity

Dioxin properties

1. Dioxins and Furans Comparable toxicity, dioxin > furan Both produced in minute quantities from natural combustion Both produced in significant quantities from chemical synthesis as contaminant runaway chemical reactions combustion (PVC plastics) effluent (Cl pulp bleaching)

2. Dioxins and Furans 75 dioxins, 135 furans Mono-, di-, octa- chloro dioxins and furans show little toxicity Most toxic of family are: 2,3,7,8-tetrachlorodibenzodioxin (TCDD) 2,3,7,8-tetrachlorodibenzofuran (TCDF) 1,2,3,7,8-pentachlorodibenzodioxin (PCDD) 2,3,4,7,8-pentachlorodibenzofuran (PCDF)