Quantification Of Methanol In Biodiesel Through H-1 Nuclear Magnetic Resonance Spectroscopy

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Two methods are proposed for the quantitative analysis of residual methanol in biodiesel. Both of them use hydrogen nuclear magnetic resonance spectroscopy (H-1 NMR) as the main analytical tool. The first one applies the standard addition method, in which methanol is added directly to aliquots of the analyzed sample, while the other one employs tert-butyl methyl ether as an internal standard. Statistical comparisons between the results obtained from the methods proposed here and from the gas chromatographic method which is recommended by the European Standard EN 14110 show that both spectroscopic methods offer equivalent results compared with the standard one. Therefore, the two spectroscopic methods developed to quantify methanol in biodiesel are proposed here as alternatives to the official method. (C) 2016 Elsevier Ltd. All rights reserved.17599104CNPqConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq