Polychlorinated Biphenyls
Mostrando 25-36 de 122 artigos, teses e dissertações.
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25. Substâncias tóxicas persistentes (STP) no Brasil
The present article presents an assessment of PTS in Brazil including polychlorinated biphenyls, polycyclic aromatic hydrocarbons, benzene hexachloride, aldrin, dieldrin, endrin, p,p,-DDT, p,p,DDE, p,p,-DDD, hexachlorocyclohexanes (alpha-HCH, beta-HCH, gamma-HCH and delta-HCH), endossulfan, heptachlor and pentachlorophenol. The data presented here are relate
Química Nova. Publicado em: 2007
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26. Destinação final de transformadores elétricos contaminados com PCBs, via tecnologia de descontaminação e reciclagem dos metais: um ganho ambiental, econômico e da saúde ocupacional / Final destination of PCBs contaminated electrical transformers, through a technology of decontamination and metallic components recycling: a gain for the environment, for the occupational health and finance
The electrical transformers contains Polychlorinated Biphenyls (PCBs), at the end of their lifespan and or by legal imposing, must have theirs disposal in environmentally appropriate conditions. This thesis will be based upon the authors previous research and study, which resulted in an industrial unit named TECORI, located in Pindamonhangaba, SP. It has bee
Publicado em: 2007
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27. 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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28. Ocorrência de compostos organoclorados em Euphausia superba e em ovos gorados de pingüins do gênero Pygoscelis / Occurrence of organochlorine compounds in Euphasia superba and uhatched eggs of Pygoscelis genus penguins
Polychlorinated biphenyls (PCBs) and organochlorine pesticides are compounds that do not occur naturally in the environment and are not easily degraded by chemical or microbiological action. Their study in the environment is important due to persistence, toxicity, liposolubility and consequent biomagnification. For these reasons, they represent the majority
Publicado em: 2007
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29. Utilização de metodos quimiometricos em cromatografia gasosa com microextração em fase solida / Utilization of chemometric methods in gas chromatography with solid phase microextraction
The purpose of this work was to explore the utilization of gas chromatography with the previous stage of sample preparation through solid phase microextraction in different matrices, innovating and becoming feasible these applications using chemometric methodologies, specially the ones that involve artificial intelligence technique. It was realized the simul
Publicado em: 2007
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30. Persistent organic pollutants in two reservoirs along the Paraíba do Sul-Guandu River system, Rio de Janeiro, Brazil
Sediment contamination is evaluated by determining organic micropollutants (organochlorine compounds - OCs and polycyclic aromatic hydrocarbons - PAHs) in two important Brazilian water reservoirs. Trace levels of OCs were observed in the Santana reservoir (44.8 ng g-1 d.w. of p,p'-DDT), while in the Funil reservoir the levels were below detection level. Fort
Química Nova. Publicado em: 2005-12
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31. DEGRADAÇÃO DE BIFENILOS POLICLORADOS (PCBs) POR MICRORGANISMO DE INTERESSE TECNOLÓGICO NA INDÚSTRIA CÁRNEA / DEGRADATION OF POLYCHLORINATED BIPHENYLS (PCBs) BY MICROORGANISM OF TECHNOLOGICAL INTEREST IN MEAT INDUSTRY
Due to the risk for human health associated to the presence of polychlorinated biphenyl (PCB) residues in foods, there is an interest in knowing the different factors that could reduce such contamination. Previous research has demonstrated that food processing modifies both qualitative and quantitatively, the organochlorine contamination, specially PCBs, of
Publicado em: 2005
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32. ESTIMATED DAILY INTAKE OF POLYCHLORINATED BIPHENYLS FROM CHEESE BY UNIVERSITY STUDENTS IN SANTA MARIA RS BRASIL / INGESTÃO DIÁRIA ESTIMADA DE BIFENILOS POLICLORADOS A PARTIR DE QUEIJO POR UNIVERSITÁRIOS EM SANTA MARIA RS
Foodstuffs free of toxic substances are a continuous concern, for food industry, educational and research institutes, and mainly for consumers. Polychlorinated biphenyls (PCBs) are industrial organochlorine substances used in electrical transformers and capacitors oil. Due to the inappropriate discharge, PCBs contaminate the environment and enter in the food
Publicado em: 2005
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33. Polychlorinated dibenzo-p-dioxins (PCDD), dibenzofurans (PCDF) and polychlorinated biphenyls (PCB): main sources, environmental behaviour and risk to man and biota
Polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofuranes (PCDF) and polychlorinated biphenyls (PCB) are types of persistent and bioaccumulating organic pollutants with enhanced chronic toxicity and carcinogenic properties and can be considered as environmental indicators of anthropogenic activities since their occurrence in the environment can always be l
Química Nova. Publicado em: 2004-12
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34. DETERMINAÇÃO DE BIFENILOS POLICLORADOS EM CARNE E PRODUTOS CÁRNEOS NO ESTADO DO RIO GRANDE DO SUL, BRASIL / DETERMINATION OF POLYCHLORINATED BIPHENYLS IN MEAT AND MEAT PRODUCTS FROM THE STATE OF RIO GRANDE DO SUL, BRAZIL
No presente trabalho foi validada uma metodologia analítica, empregando cromatografia gasosa com micro detector de captura eletrônica (CG/μECD), com a finalidade de identificar e quantificar os bifenilos policlorados PCBs nos. 10, 28, 52, 153, 138 e 180 em amostras de carne e de produtos cárneos obtidos em diferentes regiões do Estado do Rio Grande
Publicado em: 2004
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35. Estudo do coeficiente de partição octanol-água de bifenilas policloradas (PCBs) utilizando parâmetros topológicos
A model based on chemical structure was developed for the accurate prediction of octanol/water partition coefficient (K OW) of polychlorinated biphenyls (PCBs), which are molecules of environmental interest. Partial least squares (PLS) was used to build the regression model. Topological indices were used as molecular descriptors. Variable selection was perfo
Química Nova. Publicado em: 2003-05
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36. "Caracterização polifásica da biodiversidade de isolados degradadores de poluentes xenobióticos na baixada santista" / "Polyphasic characterization of xenobiotic-degrading bacteria diversity in Santos estuary"
Recalcitrant compounds such as polychlorinated biphenyls (PCBs) and hydrocarbons have attracted researchers attention all over the world, because of their persistence and side effects to the environment and to the humanity. The knowledge of genotypic an phenotypic biodiversity of xenobiotic compound degrading-microorganisms is extremely important for the c
Publicado em: 2002