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Type: Artigo de periódico
Title: Zirconium and hafnium determination by energy dispersive X-ray fluorescence with solid phase preconcentration
Author: PeraltaZamora, P
CornejoPonce, L
Bueno, MIMS
Martins, JW
Abstract: Two preconcentration methods has been developed for simultaneous determination of zirconium and hafnium by energy dispersive X-ray fluorescence (EDXRF). The first method is a liquid-solid extraction procedure with the use of an anionic exchange resin modified with xylenol orange. The second is a precipitation procedure carried out in the presence of lanthanum. Both methods permit significant enhancement of sensitivity in comparison with direct measurement in the aqueous phase. The applicability of both procedures for the preconcentration of Zr and Hf prior to their determination by EDXRF was demonstrated by analyzing synthetic mixtures and a sample of zirconium ore. The results obtained with the use of the modified resin show relative standard deviation of about 4% and good agreement with those obtained by spectrographic analysis. (C) 1997 Published by Elsevier Science B.V.
Subject: hafnium
X-ray fluorescence
Country: Holanda
Editor: Elsevier Science Bv
Citation: Talanta. Elsevier Science Bv, v. 44, n. 5, n. 811, n. 816, 1997.
Rights: fechado
Identifier DOI: 10.1016/S0039-9140(96)02117-0
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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