Journal
TALANTA
Volume 168, Issue -, Pages 121-125Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2017.03.027
Keywords
Biodiesel; Diesel; Adulteration; Nuclear magnetic resonance analysis
Categories
Funding
- Brazilian National Council of Technological and Scientific Development (CNPq) [404808/2013-1]
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An alternative method is proposed for the quantitative analysis of biodiesel in diesel-biodiesel blends. It is based on hydrogen nuclear magnetic resonance (H-1 NMR) spectroscopy and applies univariate calibration, in which the integrals of the spectra are considered. Statistical comparisons between the results obtained from the method proposed here and from the infrared (IR) spectrometry method, which is recommended by the European Standard EN 14078, show that the H-1 NMR method offers equivalent results compared with standard ones. Furthermore, the proposed H-1 NMR method recognizes the difference between biodiesel and vegetable oil, whereas the IR method cannot. Therefore, the 111 NMR method developed to quantify biodiesel in diesel-biodiesel blends is proposed here as a more practical and efficient alternative to the official method, because besides quantifying biodiesel in blends, it indicates adulteration with vegetable oil, either as the intentional and illegal addition of this raw material or because of a low degree of transesterification conversion during biodiesel synthesis.
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