Time-domain NMR: A novel analytical method to quantify adulteration of ethanol fuel with methanol. (15th December 2019)

• Record Type: Journal Article
• Authors: Kock, Flávio V.C.; Rocha, Tainara C.; Araújo, Gabriela M.; Simões, Fábio R.; Colnago, Luiz A.; Barbosa, Lúcio L.
• Is Part Of: Fuel. Volume 258(2019)
• Publication Date: 2019-12-15
• Subjects: Biofuel -- Ethanol -- Methanol -- Adulteration -- NMR relaxometry; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2019.116158
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: TD-NMR can be used as simple, rapid, non-destructive and cheap analytical method. NMR allowed quantify the adulteration of ethanol fuel with methanol. The T2 measurements allowed to predict the ethanol fuel adulteration. Abstract: The transverse relaxation time (T2 ), measured using a benchtop time-domain nuclear magnetic resonance (TD-NMR) relaxometer, was evaluated as a potential analytical method to quantify methanol as an adulterant in commercial ethanol. The T2 measurements, using the Carr-Purcell-Meiboom-Gill pulse sequence, can be performed in a non-destructive manner, within a few seconds and without sample preparation. The T2 value shows a linear correlation with methanol concentration in ethanol, capable of predicting the methanol adulteration with a high determination coefficient (r 2 = 0.99). Therefore, TD-NMR can be used as simple, rapid, non-destructive and cheap analytical method to quantify the presence of methanol in ethanol fuel.