Aroclor
Mostrando 1-12 de 46 artigos, teses e dissertações.
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1. A Selective Gas Chromatography-Selected Ion Monitoring Mass Spectrometry (GC-MS/SIM) Method to Determine Polychlorinated Biphenyls in Fuller’s Earth
Polychlorinated biphenyls (PCBs) are carcinogenic to humans and can be found in Fuller’s earth used for the regeneration of used transformer oil. This work describes a highly selective gas chromatographic-selected ion monitoring mass spectrometric method (GC-MS/SIM) for the simultaneous determination of three Aroclor PCB congener mixtures (1242, 1254, and
J. Braz. Chem. Soc.. Publicado em: 2020-03
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2. Degradação de bifenila policlorada e caracterização da comunidade microbiana de reator anaeróbio com biofilme / Studies on the biodegradation and degradation of polychlorinated biphenyl in anaerobious conditions
Métodos de Microbiologia de anaeróbios estritos e de Biologia Molecular foram empregados para se conhecer a diversidade de microrganismos relacionados à degradação de ascarel em reatores anaeróbios metanogênicos. A avaliação de potencial metanogênico foi realizada para a escolha da melhor condição nutricional, bem como, para a seleção de materi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/10/2011
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3. Catalytic hydrodechlorination of polychlorinated biphenyls (PCBs) / Hidrodescloração catalítica de bifenilas policloradas (PCBs)
Bifenilas policloradas (PCBs) foram produzidas comercialmente entre 1929 e meados da década de 1980 para propósitos industriais. As mesmas propriedades que despertaram o interesse industrial, tais como: inércia química, alta constante dielétrica, resistência à queima; foram responsáveis pelo espalhamento dos PCBs em todos os compartimentos ambientais
Publicado em: 2008
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4. Screening method for rapid determination of polychlorinated biphenyls in transformer oil by liquid-liquid extraction and gas chromatography-mass spectrometry
Um método simples e rápido foi desenvolvido para análise de bifenis policlorados (PBC) em transformadores a óleo. O método baseia-se na extração líquido-líquido em metanol e subseqüente determinação direta por cromatografia gasosa acoplada a espectrômetro de massa. A polaridade do metanol permite extrair PCBs, junto com uma quantidade mínima de
Journal of the Brazilian Chemical Society. Publicado em: 2007
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5. Analytical methodology for analyses of PCBs in liver of fish of the river Paraíba do Sul, SP / Metodologia analítica para análise de PCBs em fígado de peixe do Rio Paraíba do Sul
The chlorinated biphenyls are organochlorinated compound with around 209 congeners some them are very toxic. They were produced during 30 years and used mainly in the eletronic equipment (transformers and capacitors). Brazilian legislation dont obligate the substitution of equipaments containing PCBs that are still being used. So this could be a signifincat
Publicado em: 2000
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6. CONSTRUCTION AND DETECTION OF THE RECOMBINANT RHODOCOCCUS SP. STRAIN RHA1 FOR MINERALIZATION OF PCBs IN SOIL
PCBs are still one of the most important environmental pollutants. We developed a strategy of combining the biphenyl and 4-chlorobenzoate (4-CBA) degradation pathways into the same microorganism for PCB degradation. The genes from Arthrobacter globiformis strain KZT1 responsible for transforming 4-CBA into 4- hydroxybenzoate were sequenced and their products
Publicado em: 2000
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7. Extensive degradation of Aroclors and environmentally transformed polychlorinated biphenyls by Alcaligenes eutrophus H850.
We have isolated and characterized a strain of Alcaligenes eurtrophus, designated H850, that rapidly degrades a broad and unusual spectrum of polychlorinated biphenyls (PCBs) including many tetra- and pentachlorobiphenyls and several hexachlorobiphenyls. This strain, which was isolated from PCB-containing dredge spoils by enrichment on biphenyl, grows well o
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8. Microbial Reductive Dechlorination of Aroclor 1260 in Anaerobic Slurries of Estuarine Sediments
Reductive dechlorination of Aroclor 1260 was investigated in anaerobic slurries of estuarine sediments from Baltimore Harbor (Baltimore, Md.). The sediment slurries were amended with 800 ppm Aroclor 1260 with and without the addition of 350 μM 2,3,4,5-tetrachlorobiphenyl (2,3,4,5-CB) or 2,3,5,6-tetrachlorobiphenyl (2,3,5,6-CB) and incubated in triplicate at
American Society for Microbiology.
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9. Polychlorinated Biphenyls: A New Type of Inducer of Cytochrome P-448 in the Liver
The CO-difference spectrum of microsomes from rats treated with the polychlorinated biphenyls mixture, Aroclor 1254, has an absorption maximum at 448 nm. With ethylisocyananide as the ligand for reduced microsomes, Aroclor 1254 treatment causes a shift in the 455-nm peak to 453 nm and increases the ratio of absorbance of 455 nm to that at 430 nm from 0.53, o
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10. Dechlorination of Four Commercial Polychlorinated Biphenyl Mixtures (Aroclors) by Anaerobic Microorganisms from Sediments †
The rate, extent, and pattern of dechlorination of four Aroclors by inocula prepared from two polychlorinated biphenyl (PCB)-contaminated sediments were compared. The four mixtures used, Aroclors 1242, 1248, 1254, and 1260, average approximately three, four, five, and six chlorines, respectively, per biphenyl molecule. All four Aroclors were dechlorinated wi
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11. Cometabolism of polychlorinated biphenyls: enhanced transformation of Aroclor 1254 by growing bacterial cells.
Acinetobacter sp. strain P6 and a soil isolate, Arthrobacter sp. strain B1B, were tested for their ability to transform Aroclor 1254 as washed resting cells and as growing cells with biphenyl as the substrate. Growing cells were far superior to resting-cell suspensions in terms of total polychlorinated biphenyl (PCB) transformation, transformation of specifi
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12. Effects of Polychlorinated Biphenyls on Growth and Respiration of Heterotrophic Marine Bacteria †
A number of marine bacterial isolates from both near-shore and open-ocean environments were tested for growth inhibition with exposure to low concentrations (1 to 100 μg/liter) of Aroclor 1254, a commercial mixture of polychlorinated biphenyls (PCBs). Of over 17 bacterial cultures tested, growth of only two open-ocean isolates, one a pseudomonad and the oth