Abstract
Water, sediments and water hyacinths ( Eichhornia crassipes) from the Morichal Largo River in Venezuela were analysed for various major and trace elements in an attempt to obtain background geochemical data prior to future industrial activity. The river water has low metal concentrations. The sediments consist of very fine-to medium-grained quartz sand with only traces of clay mineral capable of reflecting contamination, as well as of detrital minerals containing Ti, Fe and Zr. Concentrations of Cr, Ni, Cu, Zn, Cd and Pb were determined for the leaves and roots of the water hyacinths. These plants are efficient concentrators of various metals and should be useful in assessing possible future metal pollution in the river.
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