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| Registros recuperados: 200 | |
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| Chalén, F.. |
| Los hidrocarburos fueron investigados en el área costera del Litoral Ecuatoriano bajo el proyecto ODEPLAN del INP. La información evaluada corresponde al mes de octubre del 2003. Se programaron un total de 42 sitios para el muestreo de sedimentos de fondo, los cuales fueron demarcados con un GPS (Global Positional System). Las muestras de sedimentos fueron colectadas utilizando draga Van Veen, las mismas que fueron analizadas de acuerdo a la metodología señalada por UNIESCO/COI/PNUMA y leídas por Espectrofluometría. La zona mayormente monitoreada fue la Subárea A correspondiente al estuario externo del Golfo de Guayaquil, la misma que no se encontró significativamente contaminada, seguida de las Subáreas B y C, puesto que la mayoría de las concentraciones... |
| Tipo: Journal Contribution |
Palavras-chave: Hydrocarbons; Sediments; Organic compounds; Pollution; Hydrocarbon analysis. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/5373 |
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| Rodríguez Martínez, R.; Torres Rodríguez, I.; Suárez Melo, Y.; García Fuentes, O.; Beltrán González, J.. |
| The concentration of hydrocarbons of petroleum in marine sediments in areas of industrial, harbour and fishing interest to the N of the island of Cuba, as the bays of Cienfuegos, Port Father, Guantánamo, Matanzas with special emphasis in Sagua La Grande and Havana. The results showed high levels of contamination for these organic compounds in the bay of Havana, with a medium 1 220 mg·kg-1 dry matter. The biggest accumulations were in the creeks of Marimelena and Atarés. A tendency exists to diminish the degree of contamination for petroleum in these sediments. In the bay of Sagua La Grande the concentrations of total hydrocarbons were not high (averague 45 mg·kg-1 dry matter), and it allowed to classify to this ecosystem with very little influenced by... |
| Tipo: Preprint |
Palavras-chave: Pollution; Petroleum hydrocarbons; Coastal zone; Pollution; Http://aims.fao.org/aos/agrovoc/c_6077. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/3564 |
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| Mkuula, S.. |
| Pollution of wetlands is becoming a serious concern, due mainly to the rapid increase ofhuman development activities. Although most extensive wetlands are in remote places where the human activities which lead to pollution of the environment are minimal, somehave become polluted by waste products related to development activities or humansurvival. In this paper, major types of pollution from human activities are considered, includingurbanisation, industrialisation, mining, agricultural activities and oil pollution. Proposals for combating pollution problems in wetlands are discussed with a focus onpolicy, planning and legislation; administration and institutional support; environmental research and technology; and improving information, environmental... |
| Tipo: Report |
Palavras-chave: Pollution; Wetlands. |
| Ano: 1993 |
URL: http://hdl.handle.net/1834/529 |
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| Tapia, M.E.. |
| Se colectaron y analizaron un total de 96 estaciones distribuidas en cinco áreas de la Provincia de Esmeraldas durante los años 2004-2005. Se elaboraron gráficos de las especies (muestras de red de 50 µ) y la relación con los parámetros físicos y químicos. En la comunidad del fitoplancton presentó una variabilidad en la composición de especies, especialmente en el Terminal Petrolero durante septiembre del 2004 y disminuye en abril del 2005, la mayor densidad poblacional fue para el grupo de diatomeas. Las principales especies en el ambiente marino estuarino Climacosphenia monoligera, Pseudo-nitzschia paradoxa, Thalassiotrix frauenfeldii, Terpsinoe musica, Coscinodiscus excentricus. Las especies representativas en el ambiente marino Navicula tuscula,... |
| Tipo: Journal Contribution |
Palavras-chave: Phytoplankton; Diatoms; Pollution; Estuaries; Station lists; Distribution. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4653 |
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| Perigó - Arnaud, E.; Montalvo Estévez, J.; Miravet Regalado, M. E.; Enríquez Lavandera, D.; Cobas Gómez, L. S.; Ramírez Stout, O.; Rivas Rodríguez, L.; García Santos, R.. |
| Se presenta un diagnóstico sobre la calidad ambiental de la laguna costera El Doctor a partir de las principales variables físico químicas y microbiológicas indicadoras de la contaminación orgánica, su estado trófico e higiénico sanitario en tres campañas de muestreo realizadas entre febrero de 2006 y mayo y octubre de 2007. La laguna presenta un alto grado de contaminación orgánica, altos valores de nutrientes, así como, elevadas concentraciones de coliformes totales y fecales, y estreptococos fecales, los cuales, se encuentran por encima de los limites establecidos en las normas cubanas de calidad de agua para usos pesquero y recreativo (NC: 22-99 y NC: 25-99). La principal causa de la contaminación de la laguna son los residuales crudos originados por... |
| Tipo: Journal Contribution |
Palavras-chave: Pollution; Pollution; Http://aims.fao.org/aos/agrovoc/c_6077. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3423 |
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| Regadera, R.; Gómez, Y.; García, E.; Gómez, L.. |
| It is presented an analysis of several indicators of water quality in Santiago de Cuba bay and of the bacteriological state in five of its beaches. Samples were taken in surface and 8 m deep. A low transparency of the waters was detected, associated with high levels of ammonium, total phosphorus and chlorophyll. In surface the dissolved oxygen had high levels, but in 8 m there was anoxia in the most interior stations. The thermotolerant coliforms reached high concentrations in the stations of the central axis, but in the beahes, only El Níspero was not appropriate for direct contact, in accordance with the current cuban standard. By means of a principal components analysis it was determined that high ammonium and total phosphorus concentrations were... |
| Tipo: Preprint |
Palavras-chave: Eutrophication; Nutrients (mineral); Pollution; Eutrophication; Pollution; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_6077. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/3572 |
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| Van Alsenoy, V.; Bernard, P.; Van Grieken, R.. |
| The elemental composition of sediment and suspended matter samples from the Belgian coastal and offshore regions of the Southern Bight of the North Sea and from the Scheldt estuary has been determined using X-ray fluorescence and atomic absorption spectrometry.Special attention was given to the heavy metals of the black and grey lists. The bulk sediment and the clay/silt fraction were analyzed. The average heavy metal contents in the fraction <63 µm were comparable to the levels in the suspended matter. Different normalization techniques led to the identification of two different populations of sediments. Most of the sediments were enriched in Cd, Cr, Hg, Pb and Zn but no enrichment was found for Cu and Ni. Comparing these data with older data indicates... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Pollution; Sediments; Suspended particulate matter. |
| Ano: 1993 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2789 |
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| Gyedu-Ababio, T.; Furstenberg, J.P.; Baird, D.J.; Vanreusel, A.. |
| Nematodes from the sediments of the Swartkops estuary in Port Elizabeth, South Africa were investigated at 10 selected sites along a salinity gradient in the subtidal region at neap tide. The relation between nematode density, genera, community structure and environmental parameters including concentrations of seven heavy metals, Mn, Ti, Cr, Pb, Fe, Sn and Zn in the sediment were investigated. The nematode community structure was significantly influenced by the chlorophyll a concentration and sediment particle-size distribution. The number of genera had significant negative correlation with chlorophyll a and two heavy metals, Fe and Zn in the sediment. The habitat preferences of the genera were also assessed. A combination of the Shannon-Wiener Diversity... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Check lists; Density; Diversity; Ecology; Meiobenthos; Pollution; Sediment; Sediments; Nematoda [Nematodes]. |
| Ano: 1999 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7328 |
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| Ben Chekroun,K; Moumen,A; Rezzoum,N; Sánchez,E; Baghour,M. |
| The Aquatic system contamination by organic pollutants and heavy metals is one of the most serious problems that might face the environment and organisms as a whole. Interestingly, the accumulation of these pollutants is due to the anthropogenic activity, namely the intensive use of fertilizers to obtain high yields in crop production. In this paper, we compared the levels of chlorophylls, proteins, dry weight and sucrose in some red (Alsidium sp. and Gracilaria sp.) and green algae (Ulva sp.) collected from Mohandis, near Kariat and Bou Areg. Our results indicate that the algae collected nearby Bou Areg, an area well-known for its high agricultural activity, contained high levels of pigments, proteins and sugars. From the chlorophyll results, we conclude... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algae; Biomonitoring; Carbohydrates; Nador lagoon; Phytoremediation; Pigments; Pollution; Proteins. |
| Ano: 2013 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572013000100005 |
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| MARINHO,M.I.C.; SOUZA,W.M.; CABRAL,M.F.; CASTRO NETO,M.D.; QUEIROZ,M.E.L.R.; SILVA,A.A.. |
| ABSTRACT: The characterization of sorption-desorption for imazethapyr and imazapic in six agricultural soils was performed to assess the availability of these herbicides in pollution processes. In this pursuit, the batch equilibrium method and high-performance liquid chromatography were used. The magnitude of Kf values ranging from 0.38 to 2.52 mg1-n kg-1 Ln for imazethapyr and 0.43 to 2.72 mg1-n kg-1 Ln for imazapic indicate weak sorption in the evaluated soils. Soil pH (5.1 to 6.1) and iron oxalate affect sorption-desorption of both herbicides but the type and percentage of clay can be the main factor affecting these two processes. A high desorption percentage (>70%) was found in Regosol, Dystric Plinthosol, Ferralsol (for both herbicides), and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicides; Imidazolinone; Pollution; Batch equilibrium. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100342 |
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| Antoniou, Fabio; Hatzipanayotou, Panos; Koundouri, Phoebe. |
| We construct a strategic trade model of an international duopoly, whereby production by exporting firms generates a local pollutant. Governments use environmental policies, i.e., an emissions standard or a tax, to control pollution and for rent shifting purposes. Contrary to their firm, however, governments are unable to perfectly foresee the actual level of demand, the cost of abatement and the damage caused from pollution. Under these modes of uncertainty we derive sufficient conditions under which the governments optimally choose an emissions tax over an emissions standard. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Strategic Environmental Policy; Pollution; Choice of Policy Instrument; Uncertainty; Environmental Economics and Policy; F12; F18; Q58. |
| Ano: 2010 |
URL: http://purl.umn.edu/59375 |
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| Hamada, Koichi. |
| 1968 was an epoch-making year in the Japanese economic history, or in the Japanese history in general. In this centennial year after the Meiji restoration, Japan's GNP became the second largest in the world surpassing West Germany. Japan was cruising on one of the most rapid growth trajectories, but it was anticipating the shade of future changes. Student movements flourished, being synchronized the world over, pollution in urban areas erupted and inflationary pressure began to surface. Japan's balance of current account turned into a pattern of chronic surplus, the pattern that led to the collapse of the Bretton Woods regime. In the socio-economic sense, 1968 was a reflection point of Japan's high growth period. This paper describes the economic forces... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Japan; High growth period; Student movements; Collapse of Bretton Woods; Pollution; Political Economy. |
| Ano: 1996 |
URL: http://purl.umn.edu/28487 |
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| Parry, Ian W.H.; Bento, Antonio M.. |
| This paper uses analytical and numerical models to illustrate how the presence of other distortions within the transport system changes the overall welfare effect of a congestion tax. These other distortions include a transit fare subsidy, congestion on competing (unpriced) routes, accident externalities, gasoline taxes, and pollution externalities. Each of these pre-existing distortions can substantially alter the welfare effect of a congestion tax that would be predicted by a first-best analysis. If congestion taxes encourage travel on other congested routes, they can produce sizeable indirect welfare losses. In addition, induced reductions in the demand for gasoline can lead to substantial welfare losses when, as appears to be the case for European... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Congestion tax; Welfare effect; Transit subsidy; Gasoline tax; Accidents; Pollution; Public Economics; R41; H21; H23. |
| Ano: 2000 |
URL: http://purl.umn.edu/10678 |
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| Michael, Jeffrey A.. |
| The quantity of paper recycled in the U.S. has more than doubled since 1985. International trade theory predicts that this will lead to reduced imports of paper, and a shift in domestic production toward waste paper intensive outputs (e.g., newsprint) and away from higher grade products such as printing/writing paper. Import demand elasticities with respect to input prices were estimated for newsprint, printing/writing, and all paper utilizing 20 years of monthly data. The empirical results confirm the predictions of theory, and illustrate a channel through which recycling may be more beneficial for U.S. industry than the domestic environment. |
| Tipo: Journal Article |
Palavras-chave: Import demand; Paper industry; Pollution; Recycling; Environmental Economics and Policy. |
| Ano: 1998 |
URL: http://purl.umn.edu/15086 |
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| Registros recuperados: 200 | |
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