EUROPIUM PRECONCENTRATION BY FILTRATION OF TERNARY COMPLEXES PRIOR THEIR DETERMINATION BY XRF SPECTROMETRY

BONFIGLIOLI, ADOLFO; OLSINA, ROBERTO; FERNANDEZ, LILIANA; MASI, ADRIANA

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY

RSC

Año: 2003 vol. 18 p. 1263 - 1266

0267-9477

The detection of trace rare earths in diverse materials and the importance of their determination have led to the search for different preconcentration methods for their quantification through instrumental analysis. The preconcentration method for Eu proposed here is based in the formation of a ternary complex with 1,8- dihydroxy-2-[4-sulfophenylazo]-naphthalen-3,6-disulfonic acid (SPADNS) and a surfactant agent. The complex is collected on a nitrocellulose filter, obtaining a thin film. The Eu complex retained on the membrane is measured by X-ray fluorescence spectrometry. The development of the preconcentration methodology implied the study and optimisation of the ternary complex formation in terms of pH, surfactant agent, reagent concentration, etc. The preconcentration factor was 2 6 104 and the lower detection limit for the preconcentration of 25 mL of aqueous solution was 22 ng mL21. The method was successfully applied to the determination of Eu in synthetic host materialetc. The preconcentration factor was 2 6 104 and the lower detection limit for the preconcentration of 25 mL of aqueous solution was 22 ng mL21. The method was successfully applied to the determination of Eu in synthetic host material21. The method was successfully applied to the determination of Eu in synthetic host material