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Lenoir, D. ; Schramm, K.-W. ; Hutzinger, O. ; Schedel, G.

Photochemical degradation of brominated dibenzo-p-dioxins and -furans in organic solvents.

Chemosphere 22, 821-834 (1991)

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Open Access Gold as soon as Publ. Version/Full Text is submitted to ZB.

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The photolytic behavior of halogenated dibenzo-p-dioxins and -furans in the organic solvents methanol and n-hexane was investigated and the corresponding quantum-yields and first order decay rates are reported. The photolysis constants in n-hexane increase with increasing number of bromine atoms in the dibenzo-p-dioxin or dibenzofuran skeleton, e.g. from 4.5x10-4 s-1 for the monobrominated to 7.7x10-3 s-1 for the octabrominated dioxin, and from 4.0x10-3 s-1 for the dibrominated to 8.3x10-2 s-1 for the heptabrominated furan. Photolysis in methanol is nearly six times slower than in n-hexane. The bromine compounds react an order of magnitude faster than the chlorine analogues. The results were used to extrapolate the photochemical fate to lipohilic environmental surfaces.

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