2008
DOI: 10.1016/j.talanta.2007.09.010
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The use of microemulsion for determination of sodium and potassium in biodiesel by flame atomic absorption spectrometry

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Cited by 103 publications
(56 citation statements)
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“…Calibration and sample solutions prepared as described in the Procedure section were proved to be unstable, dropping down to 18% of their original concentration value after 2.5 h standing in glass or plastic flasks. Similar results were found by Jesus et al 15 who proposed the stabilization of these solutions by microemulsion formation. Thus, due to this lack of stability, it is important to analyze the calibration and sample solutions immediately after their preparation, making the use of the whole automatic sampler carrousel difficult.…”
Section: Calibration and Sample Solution Stabilitysupporting
confidence: 90%
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“…Calibration and sample solutions prepared as described in the Procedure section were proved to be unstable, dropping down to 18% of their original concentration value after 2.5 h standing in glass or plastic flasks. Similar results were found by Jesus et al 15 who proposed the stabilization of these solutions by microemulsion formation. Thus, due to this lack of stability, it is important to analyze the calibration and sample solutions immediately after their preparation, making the use of the whole automatic sampler carrousel difficult.…”
Section: Calibration and Sample Solution Stabilitysupporting
confidence: 90%
“…Results in agreement were found (paired t test, p > 0.05) for all elements in the analysis of the samples by the two instruments. It is important to take into account that the samples and calibration solutions must be prepared just before the analysis in order to avoid stability problems of the diluted solutions already described in the literature 15 and also observed in the present work as previously discussed. The results obtained are presented in Table 6.…”
mentioning
confidence: 92%
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“…These alternatives are aimed at reducing dependence on imported and non-renewable energy, mitigating some of the environmental impacts caused by petroleum derivatives, and developing alternative technologies in the area of energy (Oliveira et al, 2002). Biodiesel has emerged as a promising alternative to petroleum, firstly because it promotes a qualitative and quantitative reduction of the emission of various air pollutants (Agarwai, 2005;López et al, 2005;Ilkilic  Behcet, 2010;) and secondly, as a strategic source of renewable energy to substitute diesel oil and other petroleum derivatives (Chaves et al, 2008;Jesus et al, 2008). Biodiesel, also known as vegetable diesel, is a fuel obtained from renewable sources, such as vegetable oils and animal fats, by means of chemical processes such as transesterification, esterification and thermal cracking , Oliveira et al, 2009, Jesus et al, 2010Arzamendi et al, 2008;Canakci et al, 1999;Meher et al, 2006).…”
Section: Introductionmentioning
confidence: 99%
“…Among metals, the ones most strongly controlled are Na and K because their hydroxides are used as catalysts. These elements, which may be present as solid abrasives or as soluble soaps, can clog various mechanical parts of a vehicle (Pohl, 2010;Chaves et al, 2008;Jesus et al, 2008). In addition, other inorganic contaminants (such as Cu, Pb, Cd, Zn, Ni, etc.)…”
Section: Introductionmentioning
confidence: 99%