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Type: Artigo de periódico
Title: Evaluation of a synergetic effect between Rh as permanent chemical modifier and acetylacetone as complexing agent in Sc determination in sediment slurry samples by ETAAS
Author: Flores, AV
Perez, CA
Arruda, MAZ
Abstract: In the present work, scandium was determined in sediment slurry samples (from three different rivers) by electrothermal atomic absorption spectrometry (ETAAS). Slurries were prepared by weighting 100 mg of dry sediment samples (less than or equal to53 mum particle sizes) and adding 6 ml of HCI:HNO3:HF (3:1:2, v/v). Accurate results were only possible due to the synergetic effect between Rh as permanent chemical modifier and acetylacetone (Acac) as complexing agent. The same platforrn was used for 400 heating cycles. The performance of the chemical modification was evaluated by using scanning electron microscopy (SEM), synchrotron radiation X-ray fluorescence (SRXRF) and some figures of merit (precision and delectability). The best analytical conditions were attained using 1500 and 2550degreesC as pyrolysis and atomization temperatures. The scandium content in the liquid phase of the slurries ranged from 61 to 73%, thus indicating, in this study, that both liquid and solid phases play an important role in slurry analyses. An amount of 5.0-20.0 [mug 1(-1) Sc linear range as well as LOD and LOQ of 0.19 and 0.62 mug 1(-1) respectively, were obtained under these conditions. The accuracy was checked by using microwave-assisted decomposition, and the results compared to those obtained with the proposed methodology (slurry analysis). By checking both sets of the results, there is no statistical difference at the 95% confidence levels. (C) 2004 Elsevier B.V. All rights reserved.
Subject: scandium
slurry river sediment
permanent chemical modifier
complexing agent
electrothermal atomic absorption spectrometry
synchrotron radiation X-ray fluorescence
scanning electron microscopy
Country: Holanda
Editor: Elsevier Science Bv
Citation: Analytica Chimica Acta. Elsevier Science Bv, v. 530, n. 2, n. 299, n. 305, 2005.
Rights: fechado
Identifier DOI: 10.1016/j.aca.2004.09.065
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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