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Article
Affiliation(s)

1. Universidad Nacional de Asunción, San Lorenzo, Paraguay
2. Hydroconsult SRL, Asunción, Paraguay
3. Jožef Stefan Institute, Ljubljana, Slovenia

ABSTRACT

Selected major, minor and trace elements in bottom sediments from the Tebicuary River, a tributary of the Paraguay River, as well as from Tapiracuai Stream on the left side of the large basin of the latter river have been investigated by EDXRF (Energy Dispersive X-Ray Fluorescence) techniques to determine their correlation as well as sediments provenance. The analysis of complex spectra was performed by the AXIL software and the quantitative analysis by the QAES software. Analyzed trace and minor elements were the refractory Rb, Sr, Y, Zr, Nb, Ba, La, Ce, Nd as well Ti, Cr, V, Mn, Fe, Cu and Zn from the 3d series and Cd and Pb of known toxicity. The spidergrams of refractory elements normalized to PM (Primordial Mantle) and UC (Upper Crust) values suggest the recycling of materials of the sediments i.e., they have been subjected to weathering cycles. Spidergrams of the 3d elements normalized to UC and comparing with current sediment quality guidelines indicate that the normalized values are low and no harmful effect should be expected from them. In addition it can infer that normalization of the concentration of elements to UC values is a good approximation to estimate if the levels could be considered risky.

KEYWORDS

Bottom sediments, sediment quality guidelines, 3d series, refractory elements, PM, UC, provenance.

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