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Metal content and elemental composition of particles in cohesive sediments of the Lerma River, México
Graciela ZARAZÚA, Samuel TEJEDA, Pedro ÁVILA-PÉREZ, Leticia CARAPIA, Carmen CARREÑO, Miguel BALCÁZAR;
Revista Internacional de Contaminación Ambiental 2011 27(3)
Resumen
Inglés Español
The concentration of Cr, Mn, Fe, Cu, Zn and Pb, enrichment factors and the elemental composition, morphology and relative abundance of particles were evaluated in cohesive sediments of the upper course of the Lerma River, México. The heavy metal concentration in the cohesive sediments decreased in the following sequence: Fe > Mn > Zn > Cr > Cu > Pb. The results of enrichment factors show that Fe and Mn are conservative, Cu, Cr and Pb are lightly enriched and Zn is moderately enriched. Generally, the particle groups decrease in the follow sequence: aluminosilicate > silica > iron > sulfur > metals > calcium carbonate > calcium/phosphorus > manganese. The Fe and Mn concentrations in cohesive sediments are produced principally by natural contributions, whereas Cr, Cu, Zn and Pb concentrations are produced mainly by anthropic contributions.

Palabras clave: Heavy metals, X-ray fluorescence, scanning electronic microscopy, river sediments.
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Universidad Autónoma del Estado de México
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