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Registros recuperados: 7
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Acute toxicity tests of a textile mill wastewater effluent and a "detergent wash" with a Hermit crab (Climbinarius Africanus) (Aurivillius) OceanDocs
Ajao, E.A..
Bioassay tests were conducted with wastewater effluents from a textile mili and a detergent packing plant using the hermit crab. Clibinarius africanus. (Aurivillus) as experimental animal. LC50 values were evaluated using static testing procedures for 24, 48 and 96 hour. For the textile effluent, means of 79.0, 50.24 and 51.81 percentage effluent by volume were obtained in respect of crabs in the “medium” weight range (0.3 – 0.7grams) for the test periods. For the “detergent wash”, 95.16, 85.00 and 82.33 percentage effluent by volume represented means of values obtained for “small” size crabs (weight range 0.08–0.24 grams) and 96.0, and 81.50 percentage effluent by volume for ‘medium’ size crabs for 24, 48 and 96 hour respectively. Spearman’s Rank...
Tipo: Report Palavras-chave: Pollutants; Water pollution; Pollutants; Water pollution; Http://aims.fao.org/aos/agrovoc/c_6076; Http://aims.fao.org/aos/agrovoc/c_8321.
Ano: 1985 URL: http://hdl.handle.net/1834/2440
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Estudio de la calidad de las aguas del Estero del Muerto en base a la concentración de oxígeno disuelto.- Estación fija OceanDocs
Valencia, M.; Burgos, L.; de Espinoza, M..
Se presenta un análisis de la influencia de la marea y profundidad sobre la concentración de oxígeno disuelto en aguas del Estero del Muerto, Provincia del Guayas. Se establece que existe una relación directa de estos dos factores sobre la msima. Se encuentra mayor concentración de oxígeno disuelto en superficie, la cual disminuye conforme aumenta la profundidad, siendo mayor durante el flujo que durante el reflujo; existe un leve incremento durante la noche como producto de la agitación de las aguas por acción del viento. En forma general se concluye que existen condiciones de oxígeno en el área, lo que indica problemas de contaminación del estero.
Tipo: Journal Contribution Palavras-chave: Water quality; Swamps; Oxygen; Water pollution; Water quality; Swamps; Oxygen; Water pollution; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_7544; Http://aims.fao.org/aos/agrovoc/c_5477; Http://aims.fao.org/aos/agrovoc/c_8321.
Ano: 1987 URL: http://hdl.handle.net/1834/2155
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Heavy metal contaminants in some Nigerian marine fishes of commercial importance OceanDocs
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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Lakes water quality monitoring and management programme in developing countries OceanDocs
Mutia, Silas M.
Developing Countries face an array of traditional and modern lakes water quality problems ranging from faecal contamination to toxic chemicals. Moreover, they do so in an economic environment that is severely restricted, an institutional environment which is often poorly structured, and for which the modern scientific knowledge base is frequently poorly understood and applied. Agencies in many developing countries recognize this as major impediment to sustainable development, especially as water quality has become one of the leading economic issues for the purposes of development and investment. Generally water quality programmes tend to suffer from traditional approaches, both of methodology and legal/administrative. The Consequence is that many...
Tipo: Proceedings Paper Palavras-chave: Water quality; Water resources; Water management; Resource development; Water pollution; Environmental monitoring; Inland waters; Water reservoirs; Freshwater lakes; Developing countries; Water quality; Water resources; Resource development; Environmental monitoring; Water management; Water pollution; Inland waters; Water reservoirs; Developing countries; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_8325; Http://aims.fao.org/aos/agrovoc/c_28018; Http://aims.fao.org/aos/agrovoc/c_37876; Http://aims.fao.org/aos/agrovoc/c_8320; Http://aims.fao.org/aos/agrovoc/c_8321; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_8324; Http://aims.fao.org/aos/agrovoc/c_2222.
Ano: 2006 URL: http://hdl.handle.net/1834/1474
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Marcadores moleculares de estrés oxidativo como criterio ecotoxicológico en raíces de allium cepa expuestas a aguas contaminadas del estuario del Río Cojímar OceanDocs
Mena-Ulecia, K.; Guanche, D.; Hernández, H..
Se midieron los parámetros hidroperóxidos totales (HPT) y sustancias reactivas al ácido tiobarbitúrico (SRATB) como marcadores de peroxidación lipídica, la actividad de las enzimas antioxidantes catalasa (CAT) (EC1.11.1.6) y superóxido dismutasa (SOD) (EC1.15.1.1), así como el glutatión reducido (GSH) y los grupos tiólicos protéicos (GTP), en raíces de Allium cepa L expuestas a las aguas contaminadas de la zona estuarina del río Cojímar, como criterio ecotoxicológico. Los HPT y las SRATB estuvieron elevadas en la estación-5. La actividad de la CAT y la SOD se mantuvieron bajas lo que indica la inhibición de la actividad de estas enzimas. Un comportamiento diferente fue el encontrado para el GSH y los GTP, los cuales se mantuvieron elevados en las...
Tipo: Preprint Palavras-chave: Water pollution; Ecotoxicology; Ecotoxicology; Water pollution; Http://aims.fao.org/aos/agrovoc/c_35788; Http://aims.fao.org/aos/agrovoc/c_8321.
Ano: 2010 URL: http://hdl.handle.net/1834/3571
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Preliminary studies on the initial weathering of oil on water. OceanDocs
Oyewo, E.O..
Laboratory-scale studies on the initial weathering of some oils on water by evaporative loss and dissolution have been carried out. Evaporation rate was dependent on the type of oil and was accelerated by increased temperature, number retarded evaporation rate. The order of evaporation rate was Gas Oil >Diesel Oil > Medium fuel Oil. Dissolution rate, which varied with the type of oil, was retarded by salinity but promoted by increased temperature. With the mono-component oils tested, the cyclic, aromatic and iso-characters increased dissolution rate. The order of dissolution rate for the commercial oils was Gas Oil  Diesel Oil > Medium Fuel Oil.
Tipo: Report Palavras-chave: Oil pollution; Water pollution; Water pollution; Http://aims.fao.org/aos/agrovoc/c_8321.
Ano: 1988 URL: http://hdl.handle.net/1834/2445
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Характеристика абиотических компонент экологического состояния порта Николаев IBSS Repository
Тайченачев, Д. В.; Миньковская, Р.Я.; Демидов, А. Н..
Дана характеристика экологического состояния акватории порта Николаев и факторов, его обуславливающих, на основе анализа загрязненности, гидрометеорологических и гидрохимических параметров водной среды, наблюдаемых сетевыми подразделениями Минэкоресурсов Украины.
Tipo: Journal Contribution Palavras-chave: Water pollution; Water pollution; Http://aims.fao.org/aos/agrovoc/c_8321.
Ano: 2001 URL: http://repository.ibss.org.ua/dspace/handle/99011/571
Registros recuperados: 7
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