DETERMINAÇÃO DO TEOR DE BIODIESEL EM DIESEL EMPREGANDO O ENSAIO COLORIMÉTRICO DO ÁCIDO HIDROXÂMICO
AUTOR(ES)
Costa, Roberta P. M. da, Khalil, Thaiane C., Santos, Amanda P. F. dos, Andrade, Débora F. de, d'Avila, Luiz A.
FONTE
Quím. Nova
DATA DE PUBLICAÇÃO
2015-05
RESUMO
The aim of this paper was to use colorimetric assays for hydroxamic acid to quantify the biodiesel content in diesel and compare it with the traditional method (infrared spectroscopy, using the EN 14078 method). Samples were prepared from B2 to B10 with two kinds of diesel - S500 (red) and S50 (yellow) - to obtain two calibration curves. Through statistical methods it was shown that the slopes of the straight lines obtained for the different types of diesel were the same. Thus, the type of diesel did not influence the results of the colorimetric assay for hydroxamic acid. Real samples collected from gas stations were analyzed by both methods (colorimetry and EN 14078). By applying Student's t-test it was concluded that the methods could be considered statistically equivalent. Therefore, it was confirmed that the colorimetric assay for hydroxamic acid is suitable for detecting and quantifying the content of biodiesel in biodiesel/diesel blends and can also be easily adapted to field analyses.
Documentos Relacionados
- Determinação espectrofotométrica do teor de biodiesel metílico em misturas com óleo diesel
- Determinação espectrofotométrica do teor de biodiesel metílico em misturas com óleo diesel
- Metodologia analítica para quantificar o teor de biodiesel na mistura biodiesel: diesel utilizando espectroscopia na região do infravermelho
- Determinação do teor de umidade em grãos empregando radiação micro-ondas
- Determinação do teor de água de sementes de café empregando o método da capacitância em radiofreqüências