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Typification and quality control of the Andiroba (Carapa guianensis) oil via mass spectrometry fingerprinting
The oil from the seeds of the “Andiroba” tree, which is found throughout most tropical America, contains high levels of unsaturated triacylglycerols (TAG), which makes it attractive to the cosmetics industry. Expand
Removal of aromatics from multicomponent organic mixtures by pervaporation using polyurethane membranes: experimental and modeling
Polyurethane (PU) dense membranes were used in the separation of binary and multicomponent aromatic/aliphatic mixtures by pervaporation. The PU membranes found to be selective towards aromatics in… Expand
Fractionation of benzene/n-hexane mixtures by pervaporation using polyurethane membranes
In the present work polyurethane membranes obtained from different polyester/MDI-based polymers were used to separate benzene/n-hexane mixtures by pervaporation. In pervaporation experiments, with a… Expand
Constant-Current Coulometry Studies for Assay of Primary Reference Materials to Develop Standards for Titrimetric Analysis
Coulometry is a primary method for measuring the amount of substance of high-purity compounds and its solutions. Coulometric titration is used to determine the purity of primary reference materials… Expand
Are Benzoic Acids Always More Acidic Than Phenols? The Case of ortho-, meta-, and para-Hydroxybenzoic Acids†
To address the title question, the relative intrinsic acidities of phenol and benzoic acid as well as the isomeric family of ortho-, meta-, and para-hydroxybenzoic acids were compared. Dissociation… Expand
Easy to use spectrophotometric method for determination of aromatic diamines in biodiesel samples.
Abstract Biodiesel is the main partial substitute for petrodiesel. Some biodiesels have low oxidative stability. To solve or minimize this problem, some compounds have been added to biodiesel as… Expand
Certified reference material to water content determination in bioethanol fuel
Bioethanol is a strategic biofuel in Brazil. Thus, a strong metrological basis for its measurements is required to ensure the quality and promote its exportation. Recently, Inmetro certified a… Expand
KEY COMPARISON: International comparison CCQM-K52: Carbon dioxide in synthetic air
The first key comparison on carbon dioxide in nitrogen dates from 1993–1994 (CCQM-K1.b). Since then, numerous national metrology institutes (NMIs) have been setting up facilities for gas analysis,… Expand
pH measurement in bioethanol by using different electrodes and according to international standards.
- P. P. Borges, I. C. Fraga, Bianca S. R. Marques, J. C. Dias, V. S. Cunha
- Materials Science
- 1 April 2010
The importance of Brazilian bioethanol as biofuel has been increasing significantly. Its origin from renewable sugar cane is able to reduce carbon in the atmosphere and is one of the factors that… Expand
The carbon isotopic (13C/12C) signature of sugarcane bioethanol: certifying the major source of renewable fuel from Brazil.
Ethanol has been increasingly used worldwide as a major renewable fuel. Since it can be produced from several matrixes such as sugarcane, corn, wheat, grape and beet, it has become important for… Expand