Dioxins
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. Simultaneous Determination of 2,3,7,8-TCDD and 2,3,7,8-TCDF in Water Samples by LLE-LTP and HPLC-DAD
Polychlorinated dibenzo-p-dioxins and dibenzofurans are persistent organic pollutants which can mainly be found in the environment in water. These compounds are highly toxic and therefore developing new extraction methodologies that are simpler and cost less is highly desirable. This study aimed to optimize and validate the liquid-liquid extraction with low-
J. Braz. Chem. Soc.. Publicado em: 23/05/2019
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2. PCDD/Fs and PCBs in Soils: a Study of Case in the City of Belo Horizonte-MG
Dioxins (polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) and polychlorinated biphenyls (PCBs)) are substances that represent a global concern due to their ubiquitous presence and toxicity. Industrial processes and other human activities as well as uncontrollable accidents are the main sources that release these pollutants into t
J. Braz. Chem. Soc.. Publicado em: 2017-05
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3. PREDICTING THE BOILING POINT OF PCDD/Fs BY THE QSPR METHOD BASED ON THE MOLECULAR DISTANCE-EDGE VECTOR INDEX
The quantitative structure property relationship (QSPR) for the boiling point (Tb) of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) was investigated. The molecular distance-edge vector (MDEV) index was used as the structural descriptor. The quantitative relationship between the MDEV index and Tb was modeled by using multivaria
Quím. Nova. Publicado em: 2015-05
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4. FORMATION OF DIOXINS AND FURANS DURING MUNICIPAL SOLID WASTE GASIFICATION
Abstract Thermal treatment is an interesting strategy to dispose of municipal solid waste: it reduces the volume and weight of the material dumped in landfills and generates alternative energy. However, the process emits pollutants, such as dioxins and furans. The present study evaluated MSW gasification-combustion integrated technologies in terms of dioxin
Braz. J. Chem. Eng.. Publicado em: 2015-03
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5. POLYCHLORINATED DIBENZO-P-DIOXINS, DIBENZOFURANS, AND BIPHENYLS IN FREGATA MAGNIFICENS FROM ILHA GRANDE BAY, RIO DE JANEIRO STATE, SOUTH-EASTERN BRAZIL
O objetivo deste trabalho é realizar análises químicas em tecidos da ave marinha Fregatamagnificens que se alimenta de peixes. Esta ave é reconhecida por estar em risco de acumular contaminantes tóxicos, devido a sua alta posição na teia trófica e a sua baixa capacidade de metabolizar compostos xenobióticos. Exemplares de Fregata magnificens foram c
Braz. j. oceanogr.. Publicado em: 2015-03
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6. Avaliação de desfechos relacionados à gestação em áreas contaminadas na região do estuário de Santos e São Vicente / Evaluation of pregnancy outcomes in contaminated areas of Santos and São Vicente estuary region
Background: Santos and São Vicente Estuary is contaminated with heavy metals, organochlorines compounds, dioxins and furans. Epidemiological studies show that fetuses are more susceptible to toxic chemicals than adults. This study evaluated occurrence of pregnancy events in contaminated and non-contaminated areas in estuarine region. Methods: This cross-sec
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/08/2012
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7. Desenvolvimento de métodos para estudo de dioxinas presentes na cinza do bagaço da cana-de-açúcar : avaliação do potencial biorremediador de cepas microbianas em compostagem aeróbica / Development of methods for the study of dioxins in sugarcane bagasse ash: evaluation of bioremediation potential of microbial strains in aerobic composting
Sugarcane bagasse ash is a byproduct of sugar and alcohol industry with potential for field application. However, the presence of organic contaminants such as dioxins turns necessary the development of strategies for removal of those pollutants, such as bioremediation. Because of the high toxicity of dioxins, it is wise to develop effective and low risk meth
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2012
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8. Polymorphism of the aryl-hydrocarbon receptor gene in intron 10 of human cancers
Polychlorinated dibenzo-p-dioxins (PCDDs) and related halogenated aromatic hydrocarbons (e.g., PCDFs), often called "dioxins", are ubiquitously present environmental contaminants. Some of them, notably 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), are among the most toxic synthetic compounds known. The biological effects of dioxins are mediated via the aryl hy
Brazilian Journal of Medical and Biological Research. Publicado em: 2011-11
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9. Development of palladium nanoparticle catalysts for hydrodechlorination reaction / Desenvolvimento de catalisadores de paládio nanoparticulado para a reação de hidrodescloração
The hydrodechlorination reaction (HDC) has received great attention as an alternative treatment of organic residues, which is more efficient than incineration, especially for aromatic organic compounds, and avoids the formation of toxic species, such as furans and dioxins. The present study is focused on the preparation of supported palladium nanocatalysts f
Publicado em: 2009
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10. Investigação de dioxinas, furanos, hidrocarbonetos policíclicos aromáticos no material particulado e gases emitidos por motores diesel / Investigation of dioxins, furans and polycyclic aromatic hydrocarbons in particulate material and gases emitted by diesel engines.
To investigate emission of chlorinated dioxins and furans (PCDD/Fs) and polycyclic aromatic hydrocarbons (PAHs) in heavy duty diesel engines, through the analysis of particulate material and gases in the exhaust.To verify mutagenicity of collected particulate material and gasesous sample extracts. Material and Methods: The engine emissions tests were done in
Publicado em: 2007
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11. Evaluation of the dioxin and furan formation thermodynamics in combustion processes of urban solid wastes
Specific combustion programs (Gaseq, Chemical equilibria in perfect gases, Chris Morley) are used to model dioxin and formation in the incineration processes of urban solid wastes. Thanks to these programs, it is possible to establish correlations with the formation mechanisms postulated in literature on the subject. It was found that minimum oxygen quantiti
Eclética Química. Publicado em: 2007
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12. Degradation of dioxinas and furanos policlorados for ligninolíticos basidiomecetos fungos and its application in biorremediação process. / Degradação de dioxinas e furanos policlorados por fungos basidiomicetos ligninoliticos e sua aplicação em processo de biorremediação.
Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) are compounds produced as by-products, unintentionally, in industrials processes and combustion processes. Municipal solid waste incineration is one major source these compounds. The isomers with chlorines substituted in the 2,3,7,8 positions are thought to cause risks to human hea
Publicado em: 2005