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4367?size=60x60 Ve William Senior
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Blob HISTORICAL RECONSTRUCTION OF HEAVY METAL CONCENTRATI...

Created: 2016-03-19 13:30:41

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

210-Pb activity is an useful technique in environmental investigation, todetermine sediments accumulation rates, geochronology, and to study metals.Its activity decline exponentially with depth, and is inversely proportional to thesedimentation rate at non-impacted ecosystem. Dating of sediments, combinedwith chemical profile, allow the study of the impact events in coastal zones.In the present study, we have investigated the history of metals concentrationsand sedimentation rates of recent s...

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4367?size=60x60 Ve William Senior
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Blob SECTOR ORIENTAL DEL GOLFO DE CARIACO, VENEZUELA. UNA...

Created: 2016-03-19 13:25:58

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

The hydrochemical, physical-chemical, and biological dynamics were studied in the eastern waters of the gulf ofCariaco, where wind and precipitation patterns govern these processes to a significant degree. Average monthly values forboth surface and bottom waters were respectively as follows: temperature: 25.69 °C each; salinity: 35.41 and 35.75 units;density anomaly (ó-t): 23.43 and 23.84 kg/m3; oxygen concentration: 184.49 and 178.38 mmol/kg; pH: 7.98 and 7.94;nitrates: 3.18 and 4...

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4367?size=60x60 Ve William Senior
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Blob Evaluación de la distribución del contenido total y ...

Created: 2016-03-19 01:05:32

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

En el presente trabajo se analizó la concentración de Cu, Cd, Pb y Hg en lossedimentos superficiales del estero Santa Rosa, Provincia de El Oro, Ecuador.Las concentraciones de estos elementos fueron muy elevadas para la mayoría delas muestras analizadas en todos los puntos de muestreo seleccionados. Sudistribución no fue homogénea, ni presentó un patrón geográfico marcadamentedefinido, pudiéndose encontrar altos niveles distribuid...

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4367?size=60x60 Ve William Senior
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Blob CUANTIFICACIÓN DE LAS CONCENTRACIONES DE METALES PES...

Created: 2016-03-19 00:31:17

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

The content of Fe, Mn, Cu, Cr, Ni, Zn, Cd and Pb in muscle tissuesof fish and crustaceans from the Unare lagoon (Lagunade Unare) in the state of Anzoátegui, Venezuela, was analyzedby flame Atomic Absorption Spectrometry. The levels of thesemetals present in suspended material of the water and in sedimentswere also determined in order to detect possible impacton the ecosystem. The mean concentrations in the water werelow (0.104-0.53 μmol/L Fe; 0.004-0.06 μmol/L Mn; 0.002-0.028μ...

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4367?size=60x60 Ve William Senior
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Blob CARACTERIZACIÓN AMBIENTAL DE LA ENSENADA DE PLAYA GR...

Created: 2016-03-18 21:47:53

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

The hydrographic conditions and sanitary quality of the waters of the coastal region of Playa Grande Baywere studied during May 2003. We set up 21 stations to collect surface and bottom samples and three current meters – anupward-mounted hydroacoustic profiler and two single-point Doppler current sensors that operated for 14 days. Samples werecollected in 5-L Niskin bottles equipped with a lid-closing device operated through a cable. The samples were studied accordingto established meth...

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Blob ESPECIACIÓN QUÍMICA DE FÓSFORO EN SEDIMENTOS SUPERFI...

Created: 2016-03-18 21:39:23

Credits: User William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

The sequential extraction method SEDEX (sedimentary extraction) modificated by ANDERSON & DELANEY(2000) has been used to quantify separately four sedimentary phosphorus reservoirs in sediments of the gulf of Paria and thevenezuelan atlantic coast: adsorbed or labile plus P-associated to oxides (F1), P-authigenic (F2), P-detrital (F3) and P-organic(F4). The marine and continental origin of the sediments was determined by separation of detrital apatite (continental) andcarbonate fluorapatit...

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