| Popis: |
Exposure to sunlight in the solid state of 2,4,4′-trichloro-2′-hydroxydiphenyl ether (Irgasan® DP300) (I) produced dichlorodibenzo-p-dioxin(s) (di-CDD) and a trace amount of trichlorodibenzo-p-dioxin (tri-CDD) together with three chlorinated derivatives of Irgasan DP300, 2′,3,4,4′-tetrachloro-2-hydroxydiphenyl ether (II), 2′,4,4′,5-tetrachloro-2-hydroxydiphenyl ether (III) and 2′,3,4,4′,5-pentachloro-2-hydroxydiphenyl ether (IV). These chlorinated derivatives gave various polychlorinated dibenzo-p-dioxins (PCDDs) upon exposure to sunlight; i.e., II gave 1,2,8-tri-CDD and a tetrachlorodibenzo-p-dioxin (tetra-CDD); III gave di-CDD(s), 2,3,7-tri-CDD and a tetra-CDD and IV gave three pentachlorodibenzo-p-dioxins (penta-CDDs) with two tri-CDDs and four tetra-CDDs. Upon exposure to sunlight of commercial textile products containing Irgasan DP300, 0.02–0.03% of the agent was converted into di-CDD(s). These results suggest that Irgasan DP300 is one of the precursors of various PCDDs in the environment. |
