Biodegradability of hydroxylated derivatives of commercial polychlorobiphenyls mixtures by Rhodococcus-strains

Егорова, Д. О.; Gorbunova, T. I.; Первова, М. Г.; Kir’yanova, Tatyana D.; Демаков, В. А.; Салоутин, В. И.; Чупахин, О. Н.

doi:10.1016/j.jhazmat.2020.123328

Cited by 9 publications

(2 citation statements)

References 29 publications

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“…The RAF pathway leads to the hydroxylation of TrOCs, especially hydrophobic ones . Hydroxylation reduces the hydrophobicity of TrOCs, thus decreasing their ability to be adsorbed onto organic matter and minerals and ultimately enhancing biodegradability for aquatic microorganisms. , Thus, for environmental matrix components (especially inorganics), a database of k values with excited TrOCs is needed to evaluate their persistence characteristics. In addition, we still need to advance our understanding of byproducts and their distribution for the self-photosensitization of TrOCs.…”

Section: Environmental Implicationsmentioning

confidence: 99%

Overlooked Transformation of Nitrated Polycyclic Aromatic Hydrocarbons in Natural Waters: Role of Self-Photosensitization

Yan

Wei

et al. 2023

Environ. Sci. Technol.

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Photochemical transformation is an important process that involves trace organic contaminants (TrOCs) in sunlit surface waters. However, the environmental implications of their self-photosensitization pathway have been largely overlooked. Here, we selected 1-nitronaphthalene (1NN), a representative nitrated polycyclic aromatic hydrocarbon, to study the self-photosensitization process. We investigated the excited-state properties and relaxation kinetics of 1NN after sunlight absorption. The intrinsic decay rate constants of triplet ( 3 1NN*) and singlet ( 1 1NN*) excited states were estimated to be 1.5 × 10 6 and 2.5 × 10 8 s −1 , respectively. Our results provided quantitative evidence for the environmental relevance of 3 1NN* in waters. Possible reactions of 3 1NN* with various water components were evaluated. With the reduction and oxidation potentials of −0.37 and 1.95 V, 3 1NN* can be either oxidized or reduced by dissolved organic matter isolates and surrogates. We also showed that hydroxyl ( • OH) and sulfate (SO 4•− ) radicals can be generated via the 3 1NN*-induced oxidation of inorganic ions (OH − and SO 4 2− , respectively). We further investigated the reaction kinetics of 3 1NN* and OH − forming • OH, an important photoinduced reactive intermediate, through complementary experimental and theoretical approaches. The rate constants for the reactions of 3 1NN* with OH − and 1NN with • OH were determined to be 4.22 × 10 7 and 3.95 ± 0.01 × 10 9 M −1 s −1 , respectively. These findings yield new insights into self-photosensitization as a pathway for TrOC attenuation and provide more mechanistic details into their environmental fate.

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Section: Environmental Implicationsmentioning

confidence: 99%

Overlooked Transformation of Nitrated Polycyclic Aromatic Hydrocarbons in Natural Waters: Role of Self-Photosensitization

Yan

Wei

et al. 2023

Environ. Sci. Technol.

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“…One of the solutions to the problem of destruction of PCBs and their hydroxy derivatives is bacterial destruction [9,10]. During aerobic bacterial decomposition of PCBs, the PCB molecule is oxidized, followed by its splitting to pentadienoic and (chloro)benzoic acids [9].…”

Section: Introductionmentioning

confidence: 99%

Bacterial Degradation of PCB 70 and its Hydroxy Derivatives is an Environmentally Friendly Way to Destroy Pops

Kir’yanova

Егорова²,

Gorbunova³

et al. 2023

BIO Web Conf.

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One of the problems of our time is the environmentally safe destruction of polychlorinated biphenyls (PCBs) and their hydroxylated derivatives. The aim of the study was to investigate the features and prospects of the decomposition of PCB 70 (2,5,3’,4’-tetrachlorobiphenyl) and hydroxylated chlorobiphenyls derived from it by Rhodococcus wratislaviensis strain CH628. As a result of the application of methods of periodic cultivation, gas chromatography and light spectrometry, it was found that the efficiency of destruction of PCB 70 1 g of cells of strain CH628 was 90 mg PCB/day, and the same indicator for a mixture consisting of hydroxy derivatives obtained from PCB 70 was 56 mg PCB/day. It was shown that the strain uses all components of the mixture of hydroxy-PCB 70 as a growth substrate, but with different degradation rates. When cultivated in a mineral medium with PCB 70 or a mixture of hydroxy-PCB 70, strain CH628 forms biofilms. The analysis of the obtained results shows that the use of the Rhodococcus wratislaviensis CH628 strain will make it possible to develop a technology for the environmentally safe destruction of PCB 70 and hydroxy-PCBs derived from it.

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Degradability of commercial mixtures of polychlorobiphenyls by three Rhodococcus strains

Gorbunova

Егорова²,

Первова³

et al. 2022

Arch Microbiol

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Biodegradability of hydroxylated derivatives of commercial polychlorobiphenyls mixtures by Rhodococcus-strains

Cited by 9 publications

References 29 publications

Overlooked Transformation of Nitrated Polycyclic Aromatic Hydrocarbons in Natural Waters: Role of Self-Photosensitization

Overlooked Transformation of Nitrated Polycyclic Aromatic Hydrocarbons in Natural Waters: Role of Self-Photosensitization

Bacterial Degradation of PCB 70 and its Hydroxy Derivatives is an Environmentally Friendly Way to Destroy Pops

Degradability of commercial mixtures of polychlorobiphenyls by three Rhodococcus strains

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