Campo DC | Valor | Idioma |
dc.contributor.author | Jesus, Alexandre de | - |
dc.contributor.author | Zmozinski, Ariane Vanessa | - |
dc.contributor.author | Barbará, Janaína A. | - |
dc.contributor.author | Vale, Maria G. R. | - |
dc.contributor.author | Silva, Márcia M. | - |
dc.creator | Jesus, Alexandre de | - |
dc.creator | Zmozinski, Ariane Vanessa | - |
dc.creator | Barbará, Janaína A. | - |
dc.creator | Vale, Maria G. R. | - |
dc.creator | Silva, Márcia M. | - |
dc.date.accessioned | 2012-05-18T19:37:12Z | - |
dc.date.available | 2012-05-18T19:37:12Z | - |
dc.date.issued | 2010 | - |
dc.identifier.issn | 0887-0624 | - |
dc.identifier.uri | http://www.repositorio.ufba.br/ri/handle/ri/5927 | - |
dc.description | p. 2109–2112 | pt_BR |
dc.description.abstract | An alternative method for the determination of calcium and magnesium in biodiesel samples by flame
atomic absorption spectrometry (FAAS) is proposed. The samples were prepared as water-in-oil
microemulsions, and aqueous standards microemulsified in the same way were used for calibration.
A study of long-term stability shows that the analytes remained stable in the microemulsions for at
least 5 days. To assess the accuracy of the results, other methods were applied, such as recovery tests,
as well as a comparison to the Brazilian Standard Method ABNT NBR 15556, which consists of the
sample dilution with an organic solvent and a determination by FAAS. Limits of detection (LOD) of 0.04
and 0.1 μg g-1 and characteristic concentrations of 30 and 6 μg L-1 were obtained for calcium
and magnesium, respectively. The method showed better LODs and precision in relation to dilution
with organic solvent. The results obtained were statistically in agreement with those obtained with the
Brazilian Standard Method at a 95% confidence level, and the recovery tests presented values between
92 and 117% for biodiesel samples. The main advantages observed in relation to the dilution method
were the use of inorganic standards in the microemulsions for calibration, no use of carcinogenic organic
solvents, and the higher stability of the analytes, besides the higher sensitivity. These advantages make
the proposed method more appropriate for biodiesel routine analysis. The method was also tested for
vegetable oil analysis. | pt_BR |
dc.language.iso | en | pt_BR |
dc.publisher | ACS Publications | pt_BR |
dc.source | 10.1021/ef9014235 | pt_BR |
dc.title | Determination of Calcium and Magnesium in Biodiesel by Flame Atomic Absorption Spectrometry Using Microemulsions as Sample Preparation | pt_BR |
dc.title.alternative | Energy & Fuels | pt_BR |
dc.type | Artigo de Periódico | pt_BR |
dc.identifier.number | v. 24, n. 3 | pt_BR |
Aparece nas coleções: | Artigo Publicado em Periódico (Química)
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