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

Abstract

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.

Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring

“…Its elucidation promotes development of effective and ecological methods for remediation of contaminated waters involving photoinduced detoxification of complex solutions (Carlosa et al 2012;Tchaikovskaya et al 2008Tchaikovskaya et al , 2007Chaikovskaya et al 2008;Bryantseva et al 2008).…”

Variation of Spectral Characteristics of Coelenteramide-Containing Fluorescent Protein from Obelia Longissima Exposed to Dimethyl Sulfoxide

“…1) in the protein surrounding. Wherein the relationship between the violet and blue-green components is determined by the deprotonation of the coelenteramide phenolic group in the excited state S 1 * that, in its turn, is determined by the microsurrounding of coelenteramide in proteins or solvents [4][5][6][7][8][9][10]. in the alcium cted in a 0.02 M Tris-HCL buffer solution (pH = 7.0) and 0.005 M EDTA.…”