Interferências na Determinação do Teor de Enxofre em Amostras Oxigenadas
The technique of X-ray Fluorescence Spectrometry is widely used due to its simple methodology and the fact that it generates few residues. However, when it comes to analysis of sulfur content in fossil fuels, the technique presents problems as a result of interference caused by oxygen, an element...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/38265 |
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| Resumo: | The technique of X-ray Fluorescence Spectrometry is widely used due to its
simple methodology and the fact that it generates few residues. However, when
it comes to analysis of sulfur content in fossil fuels, the technique presents
problems as a result of interference caused by oxygen, an element present in
biofuels added to gasoline and diesel (ethanol and biodiesel respectively), which
thus obey the resolutions of Agência Nacional do Petróleo, Gás Natural e
Biocombustíveis (ANP). Considering that in Brazil, the percentage of biofuels in
fossil fuel increases every year, it was identified the need to propose a correction
for such interference. Therefore, in this work we proposed analytical curves with
corrected matrices similar to the fuels to be analyzed, following the ASTM D7220
standard for sulfur content analysis in fossil fuels using Dispersive Energy X-ray
Fluorescence Spectrometry. For the gasoline curve, a matrix with 53% isoctane,
27% ethanol and 20% toluene was used, and for the S10 and S500 diesel curves,
a matrix composed of 89% sulfur free mineral oil and 11% n-octyl alcohol was
used. Fuel samples with 10, 20, 30, 40 and 50% biofuel (ethanol for gasoline and
biodiesel for diesel) were prepared to be analyzed in the respective curves, with
matrix correction or without correction. The matrix without correction was made
using only sulfur-free mineral oil, therefore without oxygenated compounds. The
results obtained from three comparisons: approximation, Student's t-test and
percentage, showed that the proposed corrected curves match the methodology
of ASTM D5453 standard for determination of total sulfur content in hydrocarbons
by Ultraviolet Fluorescence Spectrometry, chosen as standard method because
of its advantage of not having problems of oxygen interference. |
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