Abstract
This work proposes an alternative method for determination of sodium, potassium, calcium, and magnesium in biodiesel by flame atomic absorption spectrometry (FAAS), using dissolution in ethanol for sample preparation. The ethanolic medium enabled the use of aqueous standards, and adjustment of the viscosity of the solutions was achieved using samples of washed biodiesel, free of the analytes. The analytical curves showed linear correlation coefficients (r) higher than 0.99, and the slopes obtained using different matrices indicated that the matrix had no influence on quantification of the analytes. The instrumental limits of detection (LOD) and quantification (LOQ) for all metals were in the ranges 0.05- 0.31 mg kg-1 and 0.17-1.02 mg kg-1 , respectively. The recovery percentages were in the range 99-114%, with relative standard deviations (RSD) lower than 15%. The accuracy of the method was also evaluated by comparison with the Brazilian official method, and no significant differences were observed (p=0.05). These results suggest that ethanol dissolution can be used as an alternative method of sample preparation for determination of Na, K, Ca, and Mg in biodiesel samples by FAAS.
Keywords: Biodiesel, metals, flame atomic absorption spectrometry, ethanol dissolution.
Current Analytical Chemistry
Title:Dissolution in Ethanol as a Sample Preparation Procedure for Determination of Metals in Biodiesel by FAAS
Volume: 10 Issue: 1
Author(s): Márcia Regina Lopes de Magalhães, Ariane Isis Barros, Adriana Paiva de Oliveira, Adriana dos Santos da Silva and Ricardo Dalla Villa
Affiliation:
Keywords: Biodiesel, metals, flame atomic absorption spectrometry, ethanol dissolution.
Abstract: This work proposes an alternative method for determination of sodium, potassium, calcium, and magnesium in biodiesel by flame atomic absorption spectrometry (FAAS), using dissolution in ethanol for sample preparation. The ethanolic medium enabled the use of aqueous standards, and adjustment of the viscosity of the solutions was achieved using samples of washed biodiesel, free of the analytes. The analytical curves showed linear correlation coefficients (r) higher than 0.99, and the slopes obtained using different matrices indicated that the matrix had no influence on quantification of the analytes. The instrumental limits of detection (LOD) and quantification (LOQ) for all metals were in the ranges 0.05- 0.31 mg kg-1 and 0.17-1.02 mg kg-1 , respectively. The recovery percentages were in the range 99-114%, with relative standard deviations (RSD) lower than 15%. The accuracy of the method was also evaluated by comparison with the Brazilian official method, and no significant differences were observed (p=0.05). These results suggest that ethanol dissolution can be used as an alternative method of sample preparation for determination of Na, K, Ca, and Mg in biodiesel samples by FAAS.
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Cite this article as:
Magalhães Regina Lopes de Márcia, Barros Isis Ariane, Oliveira Paiva de Adriana, Silva dos Santos da Adriana and Villa Dalla Ricardo, Dissolution in Ethanol as a Sample Preparation Procedure for Determination of Metals in Biodiesel by FAAS, Current Analytical Chemistry 2014; 10 (1) . https://dx.doi.org/10.2174/1573411011410010015
DOI https://dx.doi.org/10.2174/1573411011410010015 |
Print ISSN 1573-4110 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6727 |
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