Luminescence investigations of the degradation of 2-methylphenol and 4-methylphenol in water

Tchaikovskaya, O. N.; Karetnikova, E. A.; Sokolova, I. V.; Sokolova, T. V.; Fedorova, E. S.; Kudryasheva, N. S.
December 2008
Russian Physics Journal;Dec2008, Vol. 51 Issue 12, p1344
Academic Journal
Fluorescent characteristics of the photo- and biotransformations of 2-methylphenol, 4-methylphenol and their mixtures in water exposed to uv radiation of various sources and to Penicillium tardum H-2 culture have been studied. The toxicity of these solutions has also been investigated by means of bioluminescent testing. Preliminary exposure of a 4-methylphenol solution (10−3 M) to uv radiation with λ ∼ 308 nm or to the radiation of a mercury lamp inhibited the subsequent microbiological degradation. Efficient decomposition of methylphenol molecules in the mixture was detected when it was exposed to the radiation of a mercury lamp or to 222-nm radiation and then subject to biodecomposition. The irradiation of solutions of 2-methylphenol and 4-methylphenol and their low-concentration mixtures with 308-nm uv radiation or with the radiation of a mercury lamp resulted in detoxication of the solutions. Extreme toxicity was shown by 4-methylphenol solutions on exposure to uv radiation with λ ∼ 222 nm.


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