Chlorinated Hydrocarbons
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. Evaluation of a PVC sensing phase for determination of chlorinated hydrocarbons in water by mid-infrared spectroscopy
Neste trabalho, a espectroscopia no infravermelho médio foi utilizada para investigar o efeito da quantidade (25 ou 40%) e do tipo de plastificante (di-2-etilhexil ftalato (DOP), di-2-etilhexil sebacato (DOS) e 2-nitrofenil octil éter (NPOE)) na resposta analítica de uma fase sensora de poli(cloreto de vinila) (PVC) para a determinação de hidrocarboneto
Journal of the Brazilian Chemical Society. Publicado em: 2011-08
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2. PVC sensing phases for determination of aromatic and chlorinated hydrocarbons in waters employing mid infrared spectroscopy / Fases sensoras de pvc para a determinaÃÃo de hidrocarbonetos aromÃticos e clorados em Ãguas utilizando espectroscopia no infravermelho mÃdio
Os mÃtodos espectroscÃpicos baseados em sensores Ãpticos para detecÃÃo de contaminantes em Ãguas utilizam, em geral, a prÃ-concentraÃÃo do analito em uma fase sensora. Dentro dessa abordagem, o objetivo desse trabalho foi avaliar filmes de poli(cloreto de vinila) - PVC para a determinaÃÃo de benzeno, tolueno, etilbenzeno e xilenos (BTEX) e hidroca
Publicado em: 2008
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3. 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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4. Urinary porphyrins reference ranges by HPLC in a population not exposed to porphyrinogenic agents / Valores de referência de porfirinas urinárias por CLAE numa população não-exposta a agentes químicos porfirinogênicos
Porphyrins which are formed as intermediates in heme biosynthesis, vary from eight to four carboxyl groups: uro, hepta, hexa, penta and coproporphyrins. Alterations in the urinary porphyrin excretion profile may be caused by a hereditary disease or by environmental/occupational exposure. The purpose of this study was to establish a sensitive and accurate hig
Publicado em: 2005
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5. Ocorrência de compostos organoclorados (pesticidas e PCBs) em mamíferos marinhos da costa de São Paulo (Brasil) e da Ilha Rei George (Antártica). / Occurrence of organochlorine compounds (pesticides and PCBs) in marine mammals from São Paulo coast (Brazil) and King George Island (Antarctica).
Organochlorine compounds cause strong impact on the nature, as a consequence of three basic characteristics: environmental persistence, bioaccumulation, and high toxicity. The marine mammals are one of the most vulnerable organisms to the chronic toxicity of these contaminants. Besides the high concentration in the body, the female transfers part of her load
Publicado em: 2002
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6. Effects of chronic ethanol consumption on hepatic metabolism of aromatic and chlorinated hydrocarbons in rats.
The activities of liver drug-metabolising enzymes for 16 aromatic or chlorinated hydrocarbons were measured in male rats after a three-week daily intake of ethanol amounting to 30% of total energy intake. Although the ethanol feeding produced only a slight increase in the microsomal cytochrome P-450 content, it increased the in-vitro metabolism of most hydro
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7. Gas chromatographic determination of phosgene and dichloroacetylene in air1
Jeltes, R., Burghardt, E., and Breman, J. (1971). Brit. J. industr. Med., 28, 96-99. Gas chromatographic determination of phosgene and dichloroacetylene in air. Phosgene and dichloroacetylene vapours may be present in the working environment near places where chlorinated hydrocarbons are used, including exposure chambers and the like in which people or anima
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8. Metabolism of volatile chlorinated aliphatic hydrocarbons by Pseudomonas fluorescens.
A Pseudomonas fluorescens strain designated PFL12 was isolated from soil and water that were contaminated with various chloroaliphatic hydrocarbons. The isolate was able to metabolize 1,2-dichloroethane, 1,1,2-trichloroethane, 1,2-dichloropropane, 2,2-dichloropropane, and trichloroethylene.
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9. Concentrations of individual serum or plasma bile acids in workers exposed to chlorinated aliphatic hydrocarbons.
Individual serum or plasma bile acid concentrations were measured by high performance liquid chromatography in two groups of workers with differing exposures: to hexachlorobutadiene (HCBD) and a mixture of other chlorinated solvents (SOLVENT) in study A; and trichloroethylene (TCE) in study B. Exposures to HCBD and TCE were associated with highly significant
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10. Biodegradation of individual and multiple chlorinated aliphatic hydrocarbons by methane-oxidizing cultures.
The microbial degradation of chlorinated and nonchlorinated methanes, ethanes, and ethanes by a mixed methane-oxidizing culture grown under chemostat and batch conditions is evaluated and compared with that by two pure methanotrophic strains: CAC1 (isolated from the mixed culture) and Methylosinus trichosporium OB3b. With the exception of 1,1-dichloroethylen
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11. Complete degradation of polychlorinated hydrocarbons by a two-stage biofilm reactor.
A two-stage anaerobic-aerobic biofilm reactor successfully degraded a mixture of chlorinated organic compounds to water-soluble metabolic intermediates and carbon dioxide. Reductive dechlorination of hexachlorobenzene (HCB), tetrachloroethylene (PCE), and chloroform (CF) occurred on all tested primary carbon sources such as glucose, methanol, and acetate. Ho
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12. Effects of exposure to low concentrations of chlorinated hydrocarbons on the kidney and liver of industrial workers.
An assessment has been made of biochemical alterations in renal and hepatic functions of 73 male operators employed for an average of 8.2 years (range 0.5-23 years) in a chemical plant producing chlorinated hydrocarbons. Exposure to allyl chloride (AC), 1,3-dichloropropene (DCP), epichlorohydrin (ECH), and hexachlorocyclopentadiene (HEX) has regularly been d