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An alternative method for establishing crude oil properties, using 1H nuclear magnetic resonance (1H NMR) associated with partial least squares regression is proposed. It can be used for determination of API gravity, carbon residue (CR), wax appearance temperature (WAT) and basic organic nitrogen (BON). At a 95% confidence level, the main results obtained for API gravity, CR, WAT and BON models provide...
The commercially available biodiesel in Brazil is a mixture formed by two different raw materials: oleaginous plants and animal fats. Methanol is the alcohol commonly used in the transesterification of triglycerides, however, due to high ethanol production in Brazil, it can be used by manufacturers, producing a complex commercial blend. In this paper, the biodiesel content in diesel was evaluated...
The analysis of hydrocarbon using atmospheric or ambient ionization techniques still remains a challenge in mass spectrometry. Traditionally, the ionization occurs via protonation or deprotonation and thus the molecules of interest must have a basic or acidic group to generated [M+H]+ or [M−H]− ions. To overcome such limitation, it is proposed a simple, easy, fast and powerful analytical methodology...
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