Evaluation of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry for direct determination of chromium in medicinal plants
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Data
2012-12-01
Autores
Virgilio, Alex
Nobrega, Joaquim A.
Rego, Jardes F. [UNESP]
Gomes Neto, José Anchieta [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Pergamon-Elsevier B.V. Ltd
Resumo
A method for Cr determination in medicinal plants using direct solid sampling graphite furnace high-resolution continuum source atomic absorption spectrometry was developed. Modifiers were dispensable. Pyrolysis and atomization temperatures were 1500 degrees C and 2400 degrees C, respectively. Slopes of calibration curves (50-750 pg Cr, R-2>0.999) using aqueous and solid standards coincides in 96%, indicated feasibility of aqueous calibration for solid sampling of medicinal plants. Accuracy was checked by analysis of four plant certified reference materials. Results were in agreement at 95% confidence level with certified and non-certified values. Ten samples of medicinal plants were analyzed and Cr contents were in the 1.3-17.7 mu g g(-1) Cr range. The highest RSD (n=5) was 15.4% for the sample Melissa officinalis containing 13.9 +/- 2.1 mu g g(-1) Cr. The limit of detection was 3.3 ng g(-1) Cr. (C) 2012 Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
Chromium, Medicinal plant, Direct solid sampling, High-resolution continuum source graphite furnace atomic absorption spectrometry
Como citar
Spectrochimica Acta Part B-atomic Spectroscopy. Oxford: Pergamon-Elsevier B.V. Ltd, v. 78, p. 58-61, 2012.