Determination of biodiesel blend levels in different diesel samples by 1H NMR

Monteiro, Marcos Roberto; Ambrozin, Alessandra Regina Pepe; Lião, Luciano M.; Ferreira, Antônio G.

doi:10.1016/j.fuel.2008.10.010

Cited by 141 publications

(62 citation statements)

References 16 publications

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“…In both cases, the spectra were in good agreement with the spectra observed in similar studies. [20][21][22] The proton assignments were carried out based on the literature. Figure 5 shows that biodiesel has various protons which can be used to estimate the light crude oil content in the mixtures.…”

Section: Nuclear Magnetic Resonance Spectroscopymentioning

confidence: 99%

Measuring the Light Crude Oil (Lco) Content in Standard Biodiesel/Lco Blends by Thermal Analysis

et al. 2018

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The goal of the present study was to determine the potential use of thermal analysis for the measurement of the light crude oil (LCO) content of standard biodiesel mixtures. Standard samples of biodiesel/LCO blends were prepared with different ratios of biodiesel; LCO: 1:0 (biodiesel only), 1:3, 1:1, 3:1, 0:1 (LCO only). Thermogravimetry (TG) and differential scanning calorimetry were used to determine the usefulness of thermal analysis for quantification of the LCO in the mixtures. Proton nuclear magnetic resonance ( 1 H NMR) spectroscopy was also used to confirm the composition of the samples. It was found that thermogravimetric curves were not appropriate for the LCO measurements. However, the DSC signal of wax crystallization exhibited a good linear (R 2 = 0.99) correlation with the LCO content in the blend. Furthermore, it was shown that aliphatic protons (-CH 2 -) n in biodiesel and light crude oil can also be used to determine LCO in biodiesel/LCO blends.

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Section: Nuclear Magnetic Resonance Spectroscopymentioning

confidence: 99%

Measuring the Light Crude Oil (Lco) Content in Standard Biodiesel/Lco Blends by Thermal Analysis

et al. 2018

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“…NMR was successfully used by Nagy et al [62] to evaluate both the yield of transesterification and the overall quality of biodiesel by a procedure based on glycerol hydroxyl phosphitylation followed by 31 P-NMR analysis. Other applications of NMR to biodiesel analysis include determination of biodiesel levels in blends [63]; determination of free fatty acids [64] and FAME [65] in biodiesel samples and also evaluation of the biodiesel preparation process [66]. An analytical method using FTIR spectroscopy has been developed by Mahamuni and Adewuyi [67] to determine biodiesel content in the reaction mixture, which allows to monitor the transesterification reaction.…”

Section: Biodiesel Quality Controlmentioning

confidence: 99%

Electrochemical Methods in Analysis of Biofuels

Santos¹,

Takeuchi²,

Fenga³

et al. 2011

Applications and Experiences of Quality Control

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“…The quantification of formed esters can be made through many techniques, such as 1 H NMR spectroscopy [18][19][20], gaseous chromatography (GC) [21][22][23], among others. In addition, this can be done using different ways, through a calibration curve, standard addition and normalization, as examples.…”

Section: Introductionmentioning

confidence: 99%