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| Registros recuperados: 54 | |
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| Sadik, O. A.. |
| Trace metal levels were determined in tissues of eleven species of marine fishes of commercial importance and in water and sediments taken from six sites located along the Nigerian Coastal waters. The Study was undertaken to determine the occurrence and the levels of cadmium, nickel, lead, mercury and zinc in fish tissues, water and sediments, and to establish a baseline data to which future studies on the levels of this metals could be referred. The total concentrations of each element in the samples were determined without regard to chemical form. Mean levels of each element are presented to relation to the number of species examined. More detailed analytical data on these elements are given with reference to tissue analysed, size range of fish and... |
| Tipo: Report |
Palavras-chave: Heavy metals; Water pollution; Heavy metals; Water pollution; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_8321. |
| Ano: 1990 |
URL: http://hdl.handle.net/1834/2429 |
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| Marques Júnior,Aguinaldo Nepomuceno; Crapez,Mirian Araujo Carlos; Barboza,Conceição Denise Nunes. |
| The present study aimed to evaluate the water quality of the Icaraí Sewage Outfall (ISEO) area. Sampling was conducted during winter and summer, and water samples were analyzed for dissolved oxygen, pH, temperature, salinity, dissolved inorganic nutrients (DIN), seston, particulate organic matter (POM), and pigments. Results showed that the water chemistry of the area suffers temporal and spatial variation. Great variability was also seen in the C:N:P ratios of POM (August, 112:30:1; December, 59:11:1) and in the DIN concentrations. Chlorophyll-a and ammonium concentrations (4.5 µg L-1 - 71.2 µg L-1, and 0.20 µM - 52,6 µM, respectively) characterized the ISEO area as eutrophic. The dispersal of the material was not effective under certain oceanographic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eutrophication; Sewage outfall; Water pollution; Nutrients; Guanabara Bay. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000500014 |
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| Nwilo, P.C.; Badejo, O.T.. |
| Nigeria, one of the world’s largest oil exporters, has a coastline of approximately 853km facing the Atlantic Ocean. This coastline lies between latitude 4o 10’ to 6o 20’ N and longitude 2o 45’ to 8o 35’ E. The Nigerian coast is composed of four distinct geomorphology units namely the Barrier-Lagoon Complex; the Mud Coast; the Arcuate Niger Delta and the Strand Coast. 90-95% of export revenues in Nigeria is from the oil sector. Nigeria’s oil reserves are about 31.5 billion barrels, while Nigeria’s crude oil production averaged 2.118 million barrels per day in 2002. Oil spillage is a major environmental problem in Nigeria. Between 1976 and 1996 Nigeria recorded a total of 4835 oil spill incidents, which resulted in a loss of 1,896,960 barrels of oil to the... |
| Tipo: Working Paper |
Palavras-chave: Oil spills; Ecosystems; Water pollution. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/267 |
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| SAMPAIO, F. G.; BOIJINK, C. de L.; RANTIN, F. T.. |
| O aumento mundial da contaminação de sistemas de água doce com inúmeros compostos químicos industriais e naturais é hoje um dos principais problemas ambientais.Mineração, emissão de esgoto doméstico, aplicação de fertilizantes e pesticidas degradam severamente os ecossistemas aquáticos com metais pesados. A aquicultura, caracterizada nas últimas décadas como potencial atividade agropecuária não está isenta desta negativa contribuição, uma vez que utiliza, em sua cadeia produtiva, compostos que interferem diretamente na cadeia trófica dos sistemas aquícolas. Dentre os principais produtos utilizados na piscicultura, para contornar as dificuldades no processo produtivo, pode-se citar o sulfato de cobre (CuSO4) que, quando utilizado indevidamente, gera efeitos... |
| Tipo: Livros |
Palavras-chave: Ecossistema aquático; Sulfato de cobre; Poluição da água; Peixe de água doce; Toxidez; Aquicultura; Copper sulfate; Water pollution; Toxicity; Freshwater fish; Fish culture. |
| Ano: 2013 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/963179 |
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| Mwevura, H.; Othman, O.C.; Mhehe, G.L.. |
| Water samples were collected from Msimbazi and Kizinga rivers in Dar es Salaam and from the coastal marine environment receiving waters from these rivers during both the wet season and the dry season and analysed for various organochlorine pesticide residues using GC-ECD. The pesticides p,p’-DDE, p,p’-DDT, dieldrin and g-HCH were the only organochlorines detected at significantly greater concentrations above detection limits. There was a marked difference on the frequency of pesticide residue detection during the two seasons. All the wet season samples and 37.5% of the dry season samples contained p,p’-DDE at concentrations ranging from 0.05 to 0.45mg/l and 0.08 to 0.20mg/l respectively. p,p’-DDT was detected in 25% of the dry season samples at a... |
| Tipo: Journal Contribution |
Palavras-chave: Pesticides; Water pollution; Pesticide residues; Http://aims.fao.org/aos/agrovoc/c_16154. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/819 |
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| Mercier, Grégoire; Ardhuin, Fanny. |
| Spaceborne synthetic aperture radar (SAR) is well adapted to detect ocean pollution independently from daily or weather conditions. In fact, oil slicks have a specific impact on ocean wave spectra. Initial wave spectra may be characterized by three kinds of waves, namely big, medium, and small, which correspond physically to gravity and gravity-capillary waves. The increase of viscosity, due to the presence of oil damps gravity-capillary waves. This induces not only a damping of the backscattering to the sensor but also a damping of the energy of the wave spectra. Thus, local segmentation of wave spectra may be achieved by the segmentation of a multiscale decomposition of the original SAR image. In this paper, a semisupervised oil-slick detection is... |
| Tipo: Text |
Palavras-chave: Water pollution; Synthetic aperture radar; Sea surface; Satellite applications; Oil spill; Image analysis. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1948.pdf |
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| Caldelas,Cristina; Iglesia-Turiño,Santiago; Araus,Jose L.; Bort,Jordi; Febrero,Anna. |
| In the present study the physiological response of water hyacinth (Eichhornia crassipes [Mart.] Solms) to the combined exposure of excess nutrients and Hg was examined. Young water hyacinth plants were exposed to a range of HgCl2 and KNO3 concentrations. After eight weeks, submerged plant tissues reached an Hg concentration of 4 mg g-1. The accumulation of P and S was reduced by the addition of HgCl2, and also the P and K concentrations in emerged and submerged parts decreased. In contrast, the addition of HgCl2 increased Ca and Mg concentrations in submerged parts. Furthermore, the concentration ratios of submerged/emerged parts for Ca, Mg and P were also reduced by the addition of HgCl2. The interaction of HgCl2 and KNO3 was synergistic and decreased... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abiotic stress; Metal accumulation; Multiple stress; Phytoremediation; Water eutrophication; Water pollution. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000100002 |
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| Adingra, A.A.; Kouassi, A.M.. |
| La pollution induit et entraîne au quotidien la dégradation du milieu lagunaire Ebrié, avec des conséquences et des impacts multiformes sur la santé humaines et le développement socio économique. Les moyens financiers et matériels disponibles doivent être renforcés substantiellement pour mettre en place des infrastructures et des aménagements d'assainissement adéquats, tels que les centres d'enfouissements techniques de déchets d'une part, ainsi que les stations de traitement et d'épuration des eaux usées domestiques et industrielles d'autre part. De même, l'amélioration des compétences et des capacités en ressources humaines des différents acteurs institutionnels, reste déterminante pour le suivi et le contrôle de la qualité de l'eau ainsi que la gestion... |
| Tipo: Journal Contribution |
Palavras-chave: Water pollution; Water quality control; Waste water; Water reclamation. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/5812 |
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| POTT, V. J.; POTT. A.. |
| A água é um bem limitado, razão da crescente preocupação com os recursos hidrícos e a qualidade ambiental. A poluião é um sério problema que impacta nascentes e cursos d'agua, havendo necessidade urgente de pesquisas de tratamento e de preservação. Uma das formas de tratamento de esgoto é a utilizção de filtros biológicos, com brejos construídos, ou de lagoas com plantas aquáticas. Tanques com plantas aquáticas assim como brejos agem com filtros de poluentes, ajudando a devolver a água limpa aos manaciais. Algumas plantas despoluidoras são sugeridas pela sua capacidade de retirar da água nutrientes e substâncias tóxicas, dando condições favoráveis para a base alimentar nos ecossistemas aquáticos. Lemnaceas ou lentilhas d'água são muito usadas no caso das... |
| Tipo: Folhetos |
Palavras-chave: Poluição da Água; Planta Aquatica; Tratamento da Água; Aquatic plants; Water pollution; Water purification. |
| Ano: 2002 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/325560 |
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| Registros recuperados: 54 | |
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