info:eu-repo/semantics/article
Enrichment method for trace amounts of rare earth elements using chemofiltration and XRF determination
Fecha
2000-10Registro en:
de Vito, Irma Esther; Olsina, Roberto Antonio; Masi, Adriana Noemi; Enrichment method for trace amounts of rare earth elements using chemofiltration and XRF determination; Springer Verlag Berlín; Fresenius Journal Of Analytical Chemistry; 368; 4; 10-2000; 392-396
0937-0633
1432-1130
CONICET Digital
CONICET
Autor
de Vito, Irma Esther
Olsina, Roberto Antonio
Masi, Adriana Noemi
Resumen
A preconcentration method for subsequent determination of rare earth elements (REE) by X-ray fluorescence (XRF) spectrometry was developed. The method is based on using (o-[3,6-disulfo-2-hydroxy-l-naphthylazo]-benzenearsonic acid) (Thorin) as acomplexing agent which is retained on a polyamide membrane by a chemofiltration process. The pH dependence of the chemofiltration of these metal ions on the membrane and other variables, such as flow-rate, contact time, kinetic of complex formation, etc. were determined. The membrane containing the chemofiltrate formed a thin film, which eliminated the interelemental effects when measured by XRF. The detection limits were 23, 23 and 49 ng/mL for Sm(III), Eu(III) and Gd(III), respectively. High enrichment factors were obtained. The method was successfully applied to the preconcentration of Sm(III), Eu(III) and Gd(III) from different samples.