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  • Articles  (6)
  • Chemical analysis  (3)
  • Marine pollution  (3)
  • Chemistry  (1)
  • United States
  • Alexandria: National Institute of Oceanography and Fisheries  (5)
  • Maputo, CDS-MICOA  (1)
  • 2005-2009  (6)
  • 1
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    Levantamento Preliminar Dos Resíduos Sólidos Nas Praias Do Sul De Moçambique: Ponta Malongane (2005)
    Maputo, CDS-MICOA
    Details
    Publication Date: 2021-05-19
    Description: A poluição marinha e costeira em Moçambique é umas das questões ambientais mais preocupantes, não só em termos ecológicos como também em termos económicos. O desenvolvimento da indústria turística, além de benefícios directos para a economia local, regional e até nacional, pode igualmente acarretar aspectos negativos.. como é, por exemplo, o aumento da poluição costeira. O distrito de Matutuíne, Província de Maputo - Sul de Moçambique, apresenta um elevado potencial de desenvolvimento turístico, que.. durante a sua implementação irá, certamente, ser acompanhada por um aumento da poluição das praias por resíduos sólidos, vulgarmente denominados "lixo do turista". … Assim, em Janeiro do presente ano, foi efectuada uma avaliação da composição e quantidade de resíduos sólidos existentes em quatro áreas à volta da Ponta Malongane. Duas técnicas foram usadas para tal: (i) recolha aleatória (cobrindo uma área aproximada de 4 000 m2) realizadas por 2 pessoas durante 10 minutos; e (ii) recolhas sistemáticas através de 5 quadrículas de 10 x 10 m. A amostragem aleatória foi efectuada apenas numa das áreas (praias em frente ao Parque de Campismo) com o objectivo de se fazer uma comparação entre as duas técnicas. Da amostragem aleatória e sistemática, obteve-se resultados muito similares, demonstrando que a escolha de qualquer uma delas deverá ser baseada em factores de ordem puramente logística (disponibilidade de tempo, dinheiro, recursos humanos, etc). De todas as categorias de resíduos sólidos consideradas, os plásticos dominaram com percentagens que variaram de 68 a 93 %. De um modo geral, as áreas mais usadas como destino turístico apresentaram maior quantidade e diversidade de resíduos sólidos. É de salientar a relativamente elevada percentagem de alcatrão na praia em frente ao Parque de Campismo. A quantidade total de resíduos encontrados foi considerada baixa (sempre inferior a 1 Kg / 100 m2) e as praias de Malongane foram consideradas em estado não crítico de poluição. Por isso, e tendo em conta o potencial de crescimento da indústria turística da zona, são providenciadas medidas de acção preventiva de modo a manter e se possível, melhorar o estado de conservação e limpeza das praias.
    Description: Published
    Keywords: Marine pollution ; Heavy metals
    Repository Name: AquaDocs
    Type: Working Paper , Non-Refereed
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  • 2
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    Geochemical and environmental studies of recent marine sediments and some hard corals of Wadi El-Gemal area of the Red Sea, Egypt (2006)
    Alexandria: National Institute of Oceanography and Fisheries
    Details
    Publication Date: 2021-05-19
    Description: This Journal is published by National Institute of Oceanography and Fishereies, Alexandria, Egypt
    Description: The distribution of (Fe, Mn, Zn, Cu, Pb, Ni, Co and Cd) concentrations were determined in surface marine sediments and coral reefs at Wadi El-Gemal in the Red Sea area. There were significant differences in concentrations of heavy metals in the marine sediments relative to the coral reefs. Some heavy metal concentrations in sediments and coral reefs in the study area are high compared to that in the impact areas of the Egyptian Red Sea coast. The results indicate that the high concentrations of heavy metals in marine sediments and coral reefs are particularly affected by the high contribution of terrigenous materials through the stream of Wadi El-Gemal. Generally, heavy metals concentration in the sediments decreased with increasing distance from the shoreline with the exception of Pb, which increased with increasing distance from the shoreline. On the other hand, Pb concentration in coral reefs is high compared to that in some sediment samples at Wadi El- Gemal area. The grain size, carbonate, organic matter, phosphorus and heavy metals distribution reflect marked changes in lithology, biological activities in the sea and land geology of the study area. Carbonate content mainly of biogenic origin varies from 5.7 –69.5% of the sediments. Organic matter contents of the sediments (1.7 to 6.5%) and phosphorus content (110 to 5097ppm) usually reflect significant terrigenous influences. On the other hand, heavy metals show an increasing tendency in the mud fraction of Wadi El-Gemal area. The present work reflects how much the marine sediments and coral reefs are influenced by natural impacts from this wadi. The collected data will be useful in management and suitable development of the area, beside being helpful as database in the future.
    Description: NIOF
    Description: Published
    Keywords: Hard corals ; Wadi El-Gemal ; Natural impacts ; Heavy metals ; Environment ; Marine ecology ; Environments ; Marine ecology ; Marine pollution ; Sediments ; Coral reefs
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 3
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    Physico-chemical characteristics of abu za'baal ponds, Egypt (2006)
    Alexandria: National Institute of Oceanography and Fisheries
    Details
    Publication Date: 2021-05-19
    Description: NIOF, Alexandria, Egypt
    Description: The present study deals with the physical and chemical characteristics of the water of Abu Za'baal Ponds. Determination of physical parameters (air and water temperatures, transparency, electrical conductivity, salinity, total solids, total dissolved solids and total suspended solids) and chemical parameters (pH, DO, BOD, COD, HCO3 -, CO3 --, Cl- , SO4 --,Ca2+, Mg2+, Na+, K+, NO2-, NO3-, NH3, PO4--, TP and SiO2-) were carried out to identify the nature and quality of the water of Abu Za'baal Ponds. The present results reveal that the values of most physical and chemical parameters were higher than those of freshwater, lower than those of saline water and in the same range of the brackishwater. Thus, the water of Abu Za'baal Ponds can be classified as brackishwater.
    Description: National Institute of Oceanography and Fisheries- Alexandria, Egypt
    Description: Published
    Keywords: Abu Za'baal Ponds ; Chemical composition ; Coastal waters ; Environmental conditions ; Chemical analysis ; Chemical composition ; Coastal waters ; Environmental conditions ; Environmental effects
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 4
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    Polycyclic aromatic hydrocarbons and aromatic plasticiser materials in the sea water of alexandria coastal area (2006)
    Alexandria: National Institute of Oceanography and Fisheries
    Details
    Publication Date: 2021-05-19
    Description: This journal is published by NIOF, Alexandria, Egypt
    Description: Polycyclic aromatic hydrocarbons (PAHs), the real contaminants of petroleum, were detected in the surface seawater of Alexandria coastal area in winter and spring seasons of 1995. Their order of predominance, particularly for the individual components were principally due to the processes of input, transport and fluxes. Variation of PAHs was not following seasonal changes but it was slightly affected by partial dissolution of the lowerboiling aromatic hydrocarbons. The most abundant component of aromatic hydrocarbons was pyrene (PAH),112ngI-1 followed by naphthalene(56ngI-1) and its alkylated derivatives (dicyclic), then phenanthrene(14ngI-1) and its methylated derivatives (tricyclic). The potential fish carcinogenic PAH, dibenz [a & c] anthracene was found in extremely trace levels. Most aromatic hydrocarbons present in seawater were arised from combustion of various petroleum and non-petroleum products, while few aromatics were found as a result of petroleum pollution. PAHs were also detected in rain water(25ngI-1). Plasticiser mate rials (phthalates) were determined everywhere at considerable levels in the coastal area of Alexandria; which is the first district in Egypt for producing and recycling polyethylene, plastics and nylons.
    Description: NIOF
    Description: Published
    Description: Polycyclic aromatic hydrocarbons, Sources, Seasonal changes, Natural variation, Plasticizer materials, Rain water
    Keywords: Marine environment ; Environment ; Chemical analysis ; Environments ; Marine environment ; Marine pollution ; Oil pollution
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 5
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    Distribution and relationships of heavy metals in the giant clam (Tridacna maxima) and associated sediments from different sites in the Egyptian Red Sea Coast (2006)
    Alexandria: National Institute of Oceanography and Fisheries
    Details
    Publication Date: 2021-05-19
    Description: This journal is published by National Institute of Oceanography and Fisheries, Alexandria, Egypt
    Description: The giant clam (Tridacna maxima) and sediments have been collected from clean and contaminated coastal sites of the Egyptian Red Sea. Selected samples of the giant clam shells and the associated surface sediments were analyzed for Fe, Mn, Zn, Cu, Pb, Ni and Cd. Significant spatial differences in metal concentrations in Tridacna maxima and sediments were identified. Copper and lead are greatly enriched in the giant clam shells, which is related to their physiological function. Cd content is higher in Tridacna maxima than in sediments, because of the easy substitution between Cd and Ca. The levels of most metals in the giant clam shells and sediments were higher in the anthropogenic sites than in the uncontaminated sites. Generally, metal variations reflect natural conditions and human activity. Moreover, there are no clear relationships between concentrations of heavy metals in the giant clam shells and those in sediments.
    Description: NIOF, Alexandria, Egypt
    Description: Published
    Keywords: Bioaccumulation ; Heavy metals ; Giant clam ; Tridacna ; Red Sea ; Absorption ; Accumulation ; Chemical analysis ; Clam culture
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 6
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    Ecological and fisheries development of Lake Manzalah (Egypt): hydrography and chemistry of Lake Manzalah (2006)
    Alexandria: National Institute of Oceanography and Fisheries
    Details
    Publication Date: 2021-05-19
    Description: This journal is published by the NIOF, Egypt
    Description: Lake Manzalah; the largest delta Lake in Egypt represents a dynamic system that has been undergoing continuous and pronounced changes since long times. In the last year’s this Lake faced drastic problems that retarded its environmental and fisheries development; the most serious one is the discharge of waste water. It is attempted in the present study to investigate the chemical characters of Lake Manzalah water during 2001-2002. Water temperature ranged from an average of 12.35oC in January and 29.14oC in July. Dissolved Oxygen, pH and total dissolved solids were found in ranges optimum for the living of marine and freshwater fish species. The average concentrations of nutrients lied in the following ranges: 1.24 to 4.89 μmol PO4 -3 l-1 , 5.08 to 28.73 μmol SiO4 -2 l-1 and 1.81 to 17.7 μ_mol NO3-1 l-1 The concentrations of phosphorus and nitrogen compounds were found to be relatively higher at the southern regions of the Lake near to the outlets of the drains.
    Description: NIOF
    Description: Published
    Keywords: Hydrography ; Water ; Chemistry ; Chemical composition ; Water content ; Environment ; Chemical composition ; Environments ; Water content ; Fisheries
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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