Surface Water Sources
Mostrando 25-36 de 122 artigos, teses e dissertações.
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25. Acumulação de nutrientes e metais pesados em solo, água e hortaliças em áreas cultivadas com olerícolas no Agreste de Pernambuco. / Accumulation of nutrients and heavy metals in soil, water and fruits in areas cultivated with vegetables in the Agretes region of Pernambuco state.
Increasing world population elevates the demand for food. Then, it s a constant challenge to ensure food with quantity and quality appropriate. The management of soil fertility using fertilizers and controlling pests and weeds are necessary strategies for maintaining or increasing agricultural production. Agrochemicals are anthropogenic sources potentially p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011
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26. Síntesis de espumas rígidas de poliuretano obtenidas a partir de aceite de castor y poliglicerol empleando calentamiento por microondas
In this work we showed the polyurethane rigid foams synthesis using a macropolyol synthesized from castor oil and polyglycerol. This process is optimized employing a response surface analysis and using a 3² factorial design. The factors evaluated were: amount of water and tartaric acid, where tartaric acid acts as crosslinking agent and catalyst; mechanical
Polímeros. Publicado em: 11/02/2011
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27. Levantamento dos níveis de radioatividade natural em águas do alto Vale do Ribeira à planície costeira do litoral sul do Estado de São Paulo / Assessment of natural radioctivity levels in waters from Higher Ribeira Valley until the southern Sao Paulo State coastal plain
The complex exchange of fluvial, subsurface and seawater within a coastal area directly affects global biogeochemical cycles and the application of isotopic tracers, mainly natural radionuclides from U and Th series, is a powerful tool to track sources and sinks of trace elements and nutrients to this systems. The unique Ra signature applied to quantify the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/11/2010
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28. Produção e caracterização de filmes biodegradáveis de amido de mandioca e goma xantana
Biodegradable plastics from renewable, especially agricultural sources, have been the aim of constant scientific interest in recent years. Cassava starch is an abundant, renewable and low cost natural polymer considered a promising substitute for oil-based plastic packaging materials. However, starch-based plastic films tend to show low resistance to moistur
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/03/2010
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29. Recent research data on the removal of pharmaceuticals from sewage treatment plants (STP)
Pharmaceutical compounds have been detected in sewage treatment plant (STP) effluents, surface waters and, less frequently, in groundwater and drinking water, all over the world. Different sources are responsible for their appearance in the aquatic environment, however, it is widely accepted that the main sources of this type of pollutant are STP effluents.
Química Nova. Publicado em: 2010
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30. RESÍDUOS DE AGROINDÚSTRIAS FAMILIARES: IMPACTOS NA QUALIDADE DA ÁGUA E TRATAMENTO COM TÉCNICAS SIMPLIFICADAS / WASTE OF AGRO-INDUSTRY FAMILY: IMPACT ON WATER QUALITY AND TREATMENT WITH TECHNIQUES SIMPLIFIED
Human activities have altered the environmental quality especially with regard to water sources. The agro-industry activity in small scale may represent a potential pollutant different from those of other agricultural activities, and, therefore, there is the need to search alternatives to minimize its impacts. This work aims to: (a) assess the quality and qu
Publicado em: 2010
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31. Origin and composition of particulate organic matter in the estuarine-lagoon complex Mundaú-Manguaba using lipids as molecular markers / Origem e composição da matéria orgânica particulada no complexo estuarino-lagunar de Mundaú-Manguaba utilizando lipídios como marcadores moleculares
The Mundaú-Manguaba estuarine lagoon system is located in Maceió, Alagoas, Brazil. This region has been suffering an accelerated process of environmental degradation through many antropic activities like urban growth, sugar-cane processing, cattle breeding, industrials waste and sewage. The aim of this work is to evaluate the suspended particulate matter c
Publicado em: 2010
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32. SIMULTANEOUS DETERMINATION OF ORGANIC COMPOUND RESIDUES IN WATER SAMPLES BY DISPERSIVE LIQUIDLIQUID MICROEXTRACTION (DLLME) AND GC-(TQ)MS/MS / DETERMINAÇÃO DE RESÍDUOS DE COMPOSTOS ORGÂNICOS EM ÁGUA POR MICROEXTRAÇÃO LÍQUIDO-LÍQUIDO DISPERSIVA (DLLME) E GC-(TQ)MS/MS
The use of chemicals, which generates a lot off benefits, is responsible for the contamination of soil, water and foods. The concern about contamination of surface and ground water systems by pesticides has grown in scientific circles, especially by the presence of pesticides and other compounds in water sources. Thus, rapid analytical methods, sensitive and
Publicado em: 2010
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33. Disponibilidade de boro para a cultura da soja em resposta a doses e fontes do nutriente e potenciais de Ãgua do solo / Availability of boron for the soybean crop in response to doses and the potentials sources of water nutrient soil
Soybeans are an annual crop demanding boron (B). However, the boron fertilizer management should be done cautiously, especially with regard to doses to be applied because of the narrow range between adequate and toxic for this nutrient in the soil. Another important aspect directly related to the availability of B to plants refers to soil moisture conditions
Publicado em: 2009
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34. Comportamento de filtros rápidos de camada profunda no tratamento de águas de abastecimento mediante o emprego de polímeros como auxiliares de filtração. / Behavior of deep bed rapid filters treating public water supplies through the use of polymers as filter aids.
The project was to evaluate the use of anionic and cationic polymers of different molecular weights as filter aids to treat drinking water treatment of surface water sources with high degree of eutrophication, particularly with regard to particulate matter removal optimization and head loss rate minimization. The experimental apparatus was composed of four p
Publicado em: 2009
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35. Estudo das micropropriedades de resíduos sólidos gerados nos decantadores de estações de tratamento de água
The conventional or life-cycle system for water treatment (chemical coagulation, flocculation, sedimentation, filtration, disinfection, fluoridation and pH correction) employed in most water treatment plants (WTP) in Brazil turns water unfit for human consumption (spring water and surface water) into a product that is in accordance with the drinking water gu
Publicado em: 2009
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36. Biodegradação de óleo diesel por candida lipolytica em água do mar.
The biodegradation of hydrocarbons by natural population of microorganism represents one of the primary mechanisms by which diesel oil and others hydrocarbons pollutants are eliminated or transformed in the environment. It is generally accepted today that petroleum hydrocarbon, can be degraded by microorganisms as long as a few factors, such as nutrients, or
Publicado em: 2009