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Article
Author(s)
Juan F. Facetti Masulli1,2, Peter Kump3 and Mirna Delgado2
Full-Text PDF XML 885 Views
DOI:10.17265/1934-7375/2021.01.002
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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