Determination of residual oil in diesel oil by spectrofluorimetric and chemometric analysis

Multivariate calibration (PLS), principal components analysis (PCA) and linear discriminant analysis (LDA), associated to synchronous spectrofluorimetry, were used to identify and quantify non-transesterified residual vegetable oil in diesel oil with the addition of 2% of biodiesel (B2). The additio...

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Bibliographic Details
Published in:Talanta (Oxford) 2008-07, Vol.76 (2), p.479-484
Main Authors: Corgozinho, Camila N.C., Pasa, Vânya M.D., Barbeira, Paulo J.S.
Format: Article
Language:English
Subjects:
Adulteration
Analytical chemistry
Biodiesel
Chemistry
Diesel oil
Exact sciences and technology
Fluorometry - methods
Fluorometry - standards
Gasoline - analysis
Plant Oils - analysis
Reproducibility of Results
Residual oil
Spectrofluorimetry
Spectrometric and optical methods
Synchronous
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Summary:Multivariate calibration (PLS), principal components analysis (PCA) and linear discriminant analysis (LDA), associated to synchronous spectrofluorimetry, were used to identify and quantify non-transesterified residual vegetable oil in diesel oil with the addition of 2% of biodiesel (B2). The addition of residual oil, one of the easiest ways of adultering fuel, damages engines and leads to tax evasion. Using this method, the samples of diesel oil, B2, and B2 contaminated with residual oil were classified correctly and separated into three well-defined groups. The quantification of residual oil in B2 was carried out in the 0–25% (w/w) band, RMSEC and RMSEP values ranging from 0.26 to 0.48% (w/w) and 1.6–2.6% (w/w), respectively. The method is highly sensitive and efficient to identify and quantify this type of adulterant in which 100% of the samples were correctly classified and the average relative error was approximately 4% in the range 0.5–25% (w/w).
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2008.03.003