Abstract
The metal distribution of Cr, Mn, Fe, Cu, Zn, and Pb, and the elemental composition, morphology and relative abundance of particles have been evaluated in suspended matter of the Upper Course of the Lerma River in Mexico. The metal concentrations in the suspended matter decrease in the sequence: Fe > Mn > Zn > Cu = Cr > Pb. The Fe and Mn concentrations in the suspended matter are produced principally by natural contributions whereas the Cu, Zn, Cr, and Pb concentrations are produced principally by anthropogenic contributions. In general, the particle groups decrease in the following sequence: aluminosilicate > silica > sulphur > metals > calcium > manganese > iron > calcium carbonate.
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