Natural Attenuation
Mostrando 13-24 de 74 artigos, teses e dissertações.
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13. Environmental implications from leachates attenuation processes in places of solid urban wastes disposal / Implicações ambientais dos processos de atenuação de lixiviado em locais de disposição de resíduos sólidos urbanos
Estudos recentes constataram a existência de processos que permitem a atenuação natural dos contaminantes presentes nos lixiviados. O adequado entendimento destes processos pode originar benefícios possíveis de serem aplicados em aterros antigos, novos ou naqueles que ainda serão concebidos. O presente estudo avaliou o comportamento e a atenuação de
Publicado em: 2009
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14. Avaliação ambiental da área do banhado 4 afetada por vazamento de petróleo - REPAR, Araucária, PR
O Banhado 4 foi afetado, em 2000, pelo derrame de óleo na Refinaria Getúlio Vargas (Araucária, PR). Este estudo é o 1º efetuado após 3 anos em que acesso e o manejo do banhado foram interditados por questões legais. Os objetivos são avaliar as condições ambientais atuais do banhado e contribuir para o conhecimento da atenuação natural em banhado
Publicado em: 2009
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15. FE(III) AS ELECTRON ACCEPTOR FOR GASOLINE-ETHANOL BIODEGRADATION IN TROPICAL RESIDUAL SOIL / FE(III) COMO ACEPTOR DE ELÉTRONS NA BIODEGRADAÇÃO DE GASOLINA-ETANOL EM SOLO TROPICAL RESIDUAL
Gasoline monoaromatic hydrocarbons (BTEX) have been detected in aquifers due to storage tank spills from gas stations that lead to their consequent dissolution on groundwater. An aggravating factor in Brazil is ethanol being used as additive to gasoline, promoting an increase on pollutants percolation in soil since it works as co-solvent and is preferentiall
Publicado em: 2009
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16. Desenvolvimento de procedimentos analíticos limpos e com alta sensibilidade para a determinação de espécies de interesse ambiental / Development of clean analytical procedures with high sensitivity for determination of species of environmental interest
Clean analytical procedures with high sensitivity for the determination of species of environmental interest (carbaryl, sulphate and chlorine) were developed. Flow systems with solenoid micropumps were coupled to long optical pathlength spectrophotometry or cloud point extraction procedures, aiming the concentration of species for determination without emplo
Publicado em: 2009
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17. Estudo comparativo da aplicaÃÃo de vinhaÃa tratada e in natura em solos sob cultivo de cana-de-aÃÃcar
Brazil is the world leader in sugarcane plantation. Its economical exploration generates residues, standing out the vinasse. Due to the problems of ecological and social order caused by the vinasse, the most plausible solution for its disposition is the application to the soil as fertilizer. However, that application requests studies to guide the management
Publicado em: 2008
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18. DETERMINATION OF SN IN HUMAN MILK BY GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY / DETERMINAÇÃO DE SN EM LEITE HUMANO POR ESPECTROMETRIA DE ABSORÇÃO ATÔMICA NO FORNO DE GRAFITE
Tin is a metal of natural occurrence which is mainly extracted from the mineral cassiterite, SnO2. Tin may be released to the atmosphere from both natural and anthropogenic sources. In nature, it occurs in both inorganic and organic forms, and the shorter the organic chain associated to the metal, the higher the toxicity of the compound. Organotin compounds
Publicado em: 2008
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19. Características limnológicas e estrutura trófica das comunidades de peixes de alguns lagos naturais e artificiais do Rio Grande do Norte
Artificial lakes must differ from natural lakes in important structural and functional aspects that need to be understood so that these ecosystems can be properly managed. The aim of this work was to test the hypothesis that the artificial lakes (impoundments) in the semi-arid region of the Rio Grande do Norte State are more eutrophic and turbid and have dif
Publicado em: 2007
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20. Natural attenuation of gasoline and ethanol ground water plume / Atenuação natural de pluma de contaminação de gasolina e etanol em água subterrânea
A case study and two controlled field experiments were conducted to evaluate the impact of ethanol on the natural attenuation processes affecting dissolved phase of gasoline plumes. The case study was conducted in Itaguaí (RJ) where an E22 (gasoline with 22 % by volume of denatured ethanol) contaminant plume was studied. The controlled field experiments wer
Publicado em: 2006
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21. "Tomografia computadorizada, atenuação de raios gama e análise micromorfológica na avaliação de alterações na estrutura e retenção de água pelo solo" / Computed tomography, gamma-ray attenuation, and micromorphologic analysis to evaluate changes on soil structure and water retention
Soil structure is related to the arrangement of soil particles, aggregates, and pores, which makes part of this porous media. The influence of structure on soil physical phenomena ranges from macro to microscope scale. Structure changes in microscope scale are important because affect the soil particle arrangement and, consequently, the pores distribution. S
Publicado em: 2006
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22. EFEITO CLÍNICO DO USO DE PARECOXIB EM SINOVITE INDUZIDA EM PÔNEIS / EFFECT OF PARECOXIB IN INDUCED SYNOVITIS IN HORSES
Acute synovitis and capsulitis are common articular problems and can contribute to the development of a degenerative process due to the release of enzymes and inflammatory mediators. The indicated treatment for synovitis and capsulitis is based on anti-inflammatory drugs. An experimental synovitis model was used in ponies to evaluate the effect of parecoxib,
Publicado em: 2006
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23. Comparação da atenuação da radiação solar e dos fatores que determinam o clima de radiação solar subaquática em lagos e reservatórios do Brasil / Comparison of solar radiation attenuation and factors that determine underwater solar radiation climate in lakes and reservoirs of Brazil
The study of solar radiation penetration in aquatic environment was developed in four parts. The first one, directed to solar radiation attenuation in the water column, interference factors and their inter-relations were discussed. In this sense, a penetration comparison of the solar radiation in natural and artificial continental ecosystems was carried out,
Publicado em: 2003
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24. Avaliação da atenuação da vegetação da Mata Atlantica a radiação gama natural emitida pela superficie
Several natural alpha, beta and gamma radionuclides are known. Most of them occur in rock-forming minerals Potassium, uranium and thorium are the main natural gamma radiation producers. This radiation can be measured in the laboratory, field or from aircrafts. In this case, besides atmospheric attenuation, vegetation can absorb substantial amounts of radiati
Publicado em: 1997