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William Senior

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Heavy metals concentration in the bivalves Anadara t...

Created: 2017-12-12 15:20:07

Credits: William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

The concentrations of heavy metals in the bivalve molluscs Anadara similis and A. tuberculosa are determined. The specimens were collected at 2 km from the mouth of Estero Huaylá, El Oro Province, Ecuador, in November 2013. The length and weight of each species were determined in the laboratory, with two length ranges being established for A. similis and four for A. tuberculosa. The meat of the organisms was extracted, washed and dried in an oven at 60 ° C for 72 h, then digested w...

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William Senior

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Carbon regeneration in the Cariaco Basin, Venezuela

Created: 2017-12-12 14:59:23

Credits: William Senior

License: Creative Commons Attribution-Share Alike 3.0 Unported License

The carbon regeneration in the water column ofthe Cariaco Basin (Venezuela) was investigatedusing a regression model of total alkalinity (TA)and the concentration of total inorganic carbon(TCO2). Primary productivity (PP) was determinedfrom the inorganic carbon fraction assimilatedby phytoplankton and the variation of the 22 and23°C isotherm was used as an indicator of coastalupwelling. The results indicate that CO2 levels werelowest (1962 μmol/kg) at the surface and increasedto 2451 &...

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William Senior

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Especiación de metales en sedimentos del río Cuchive...

Created: 2016-11-25 14:51:19

License: Creative Commons Attribution-Share Alike 3.0 Unported License

The total concentration and the chemical forms of heavy metals were determined insuperficial sediments of the Cuchivero river, Venezuela, using sequential extraction andatomic absorption spectrophotometry with flame. Pollution indices were used to study thedistribution, pollution and environmental risk in the sediments. Total values ranged from,394-457 mgkg-1 Fe, 46,87-74,82 Mn, 6,45-11,92 Zn, 1,70-5,75 Ni, 0,39-3,7 Cu, 1,25-3,63Cr, 0,37-1,82 Co, 0,10-0,30 Cd y <Ld-0,20 mgkg-1 Pb. The meta...

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Content from the Oceanography group