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(Reference retrieved automatically from Google Scholar through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Flores‚ A.V. ; Pérez‚ C.A. ; Arruda‚ M.A.Z.
Total Authors: 3
Document type: Journal article
Source: Analytica Chimica Acta; v. 530, n. 2, p. 299-305, 2005.
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. (AU)

FAPESP's process: 99/12124-7 - Exploitation of novel materials and different reaction media for sensitivy/selectivity enhancement in the analyses of biological and environmental samples
Grantee:Elias Ayres Guidetti Zagatto
Support Opportunities: Research Projects - Thematic Grants