File:Distribución de metales pesados en sedimentos superficiales del Orinoco Medio, Venezuela.pdf

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Total concentrations and chemical forms of metals in superficial sediments of the Middle Orinoco were determined with acetic acid solution 25% (v/v)/HNO3: HCl: HClO4 (3:2:1) solution, atomic absorption spectrometry with air acetylene flame and cold vapor technique. Total values ranged from 8871 to 116759 μgFeg-1, 102.45 a 469.44 μgMn g-1; 0.93 to 17.64 μgCu g-1; 4.46 to 17.48 μgNi g-1; 2.46 to 9.61 μgCo g-1; 42.56 to 181.45 μgZn g-1; 1.29 to 8.76 μgCr g-1; 0.03 to 0.74 μgCd g-1 and 0.001 to 7.88 μgPb g-1. The metals were found to be strongly associated with the residual fraction minerals, more resistant iron oxihidroxides, metallic sulfides, and organic matter. The values ranged from 7.50-99.29% Fe; 7.75-66.34% Mn; 22.55-98.89% Zn; 22.85- 91.36% Ni; 4.20-85.03% Cu; 16.76-85.48% Co; 12.56-95.49 Cr; 7.50-99.29% Pb; 2.03-85.48% Cd). The values of metals adsorbed in the surface of particles, associated with carbonates and the reactive manganese oxihidróxidos varied from 0.04-1.97% Fe; 4.15-71.59% Mn; 0.86-3.83% Zn; 0-12.10% Ni; 1.05-14.97% Cu; 6.40-33.06% Co; 1.03-5.08% Cr; 0-1.78% Pb; 0-22.97% Cd. The total concentration of Cu, Ni, Zn and Pb in some stations like the Cabruta and Caicara of Orinoco cities are superiors to the reported for non contaminated sediments.

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current18:15, 24 March 2016 (455 KB)William Senior (talk | contribs)Total concentrations and chemical forms of metals in superficial sediments of the Middle Orinoco were determined with acetic acid solution 25% (v/v)/HNO3: HCl: HClO4 (3:2:1) solution, atomic absorption spectrometry with air acetylene flame and cold vapor
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