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| Adekanbi, E.O.; Okoye, B.C.O.; Ajao, E.A.. |
| The state of pollution in the Lagos lagoon was examined by a field survey of twenty-six sites (stations) in the dry and wet season in 1985. Some selected sites were further re-examined in the same period in 1986. The sediment trace metals and total hydrocarbons were analysed. The relationship between non residual and residual trace elements was examined. For both years of study, total trace metal levels (mg/kg) fell in the ranges: Cu,1.9 – 132.4, Cr, 2.9 – 167; 7.8 – 830. 6; Ph, 1.6 – 483.1 and Cd, 0.04 – 15.5. Total hydrocarbon concentrations in 1985 ranged from 0.25 to 2766.27 mg/g with high concentrations in muddy and sandy sediments. The results show marked variations and non – uniform distribution from one season to another. With few exceptions,... |
| Tipo: Working Paper |
Palavras-chave: Environmental pollution; Coastal waters. |
| Ano: 1991 |
URL: http://hdl.handle.net/1834/269 |
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| Ajao, E.A.. |
| Guinea coast. It is a shallow expanse of water with restricted circulation in a micro-tidal environment. This aquatic resource of multiple usages receives inputs of domestic The Lagos Lagoon is the largest of the four lagoon systems of the Gulf of hydrocarbon cooling water from a thermal power station and emissions from automobile exhaust. Micro-pollutants examined in the water, sediment and biota have included organic waste, trace heavy metals and chlorinated hydrocarbons. Concentrations detected have identified â hot spotsâ and relatively unpolluted areas for the different contaminants in the lagoon. The results show marked variations and non-uniform distribution from one season to another. It has been difficult to differentiate pollution effects... |
| Tipo: Report |
Palavras-chave: Marine pollution; Lagoons; Lagoons; Http://aims.fao.org/aos/agrovoc/c_4158. |
| Ano: 1996 |
URL: http://hdl.handle.net/1834/2213 |
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| 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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| Oyewo, E.O.; Ajao, E.A.; Orekoya, T.. |
| Continuous monitoring of Sea and Harbour (Lagoon) Surface temperature and salinity at two stations has been carried out from 1978 to 1981. This paper presents the findings for the period and relates it to the prevailing meteorological regimes. The pattern of sea surface temperature at Victoria beach in the study period shows a clearly defined mean maximum temperature of 29.34oC in April, and clearly defined mean minimum temperature of 25.63 in August. Depending on the year, there may be a less clearly defined mean maximum and minimum temperature in October/November and in January respectively. The pattern of surface temperature in the Harbour station is basically similar. The salinity cycle especially in the Harbour was found to be critically... |
| Tipo: Report |
Palavras-chave: Oceanography; Harbours; Water surface temperature; Water surface salinity; Oceanography; Salinity; Surface water. |
| Ano: 1982 |
URL: http://hdl.handle.net/1834/1270 |
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| Ajao, E.A.; Oyewo, E.O.; Unyimadu, J.P.. |
| The coastal waters in Nigeria are described in relation to the general morphology, vegetation and beach Type along the 850km coastal. The environmental sensitivity of the fragile Niger delta ecosystem is expressed by the numerous estuaries, rivers, creeks, lacustrine and inshore waters which support freshwater and brackish water mangrove swamps. Ocean resources exploited from the Niger delta and adjacent Continental platform include oil, gas and fishes. The general hydrograph and superfial circulation are described against the background of human activities in coastal settlements and developmental pressures for resource utilisation giving rise to water pollution. Micropollutants identified and measured so far include organic waste, trace heavy metals... |
| Tipo: Report |
Palavras-chave: Marine pollution. |
| Ano: 1996 |
URL: http://hdl.handle.net/1834/2214 |
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| Oyewo, E.O.; Ajao, E.A.; Orekoya, T.. |
| Continuous monitoring of Sea and Harbour (Lagoon) Surface temperature and salinity at two stations has been carried out from 1978 to 1981. This paper presents the findings for the period and relates it to the prevailing meteorological regimes. The pattern of sea surface temperature at Victoria beach in the study period shows a clearly defined mean maximum temperature of 29.34oC in April, and clearly defined mean minimum temperature of 25.63 in August. Depending on the year, there may be a less clearly defined mean maximum and minimum temperature in October/November and in January respectively. The pattern of surface temperature in the Harbour station is basically similar. The salinity cycle especially in the Harbour was found to be critically... |
| Tipo: Report |
Palavras-chave: Oceanography; Harbours; Water surface temperature; Water surface salinity; Oceanography; Http://aims.fao.org/aos/agrovoc/c_12889. |
| Ano: 1982 |
URL: http://hdl.handle.net/1834/1270 |
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