A5082091287- Mass Spectrometry Techniques and Applications
- Analytical Chemistry and Chromatography
- Pesticide Residue Analysis and Safety
- Analytical Chemistry and Sensors
- Advanced Chemical Sensor Technologies
- Biodiesel Production and Applications
- Water Quality Monitoring and Analysis
- Organophosphorus compounds synthesis
- Scientific Measurement and Uncertainty Evaluation
- Spectroscopy and Chemometric Analyses
- Metabolomics and Mass Spectrometry Studies
- Sustainable Supply Chain Management
- Chemical Reaction Mechanisms
- Synthesis and Reactivity of Sulfur-Containing Compounds
- Advanced Combustion Engine Technologies
- Semiconductor materials and devices
- Building Energy and Comfort Optimization
- Supply Chain Resilience and Risk Management
- Youth, Drugs, and Violence
- Protein Structure and Dynamics
- Agricultural pest management studies
- Health, Nursing, Elderly Care
- Phosphorus compounds and reactions
- Heat transfer and supercritical fluids
- Crystal structures of chemical compounds
Instituto Nacional de Metrologia, Qualidade e Tecnologia
2004-2022
Universidade de Caxias do Sul
2015
Universidade Federal do Rio de Janeiro
2014
Universidade Estadual de Campinas (UNICAMP)
2008-2012
Universidade Federal de Pernambuco
2008
Pontifical Catholic University of Rio de Janeiro
1999-2000
High performance thin layer chromatography (HPTLC) combined with on-spot detection and characterization via easy ambient sonic-spray ionization mass spectrometry (EASI-MS) is applied to the analysis of biodiesel (B100) biodiesel–petrodiesel blends (BX). HPTLC provides chromatographic resolution major components whereas EASI-MS allows performed directly on surface at conditions. Constituents (M) are detected by in a one component–one ion fashion as either [M + Na]+ or H]+. For both B100 BX...
Direct infusion electrospray ionization mass spectrometry (ESI-MS) of aqueous/methanolic extracts biodiesel samples is shown to permit simple and fast fingerprinting typification, identification the alcohol used in trans-esterification process, monitoring degradation adulteration, screening residual glycerin mono-, di-, tri-glycerides. As proof-of-principle cases, ESI-MS fingerprints both positive negative ion modes were acquired for derived from soybean oil, sunflower canola olive castor...
Using a simple and easily implemented desorption/ionization mass spectrometry technique, tiny droplet of biodiesel placed on the surface sheet paper is analyzed directly nearly instantaneously under ambient conditions. No pre-separation or sample preparation required, clean spectra are obtained with great simplicity. In positive ion mode, easy sonic-spray ionization spectrometry, EASI(+)-MS, provides typical profiles major components samples, that is, either methyl esters (FAME) ethyl (FAEE)...
Biodiesel is composed of saturated and unsaturated methyl esters fatty acids formed via transesterification vegetable oil or animal fat. This chemical nature makes biodiesel much more susceptible to oxidation autoxidation during long-term storage than conventional petrodiesel. Increasing resistance therefore requires the use antioxidants. paper investigates effectiveness N,N′-di-sec-butyl-p-phenylenediamine (1) as a antioxidant improve oxidative stability soybean, sunflower canola biodiesel....
In this work, an alternative procedure for the determination of As in vegetable oils and biodiesel different origins by graphite furnace atomic absorption spectrometry (GFAAS) is proposed. The sample stabilization was achieved formation three component solutions prepared mixing samples with appropriate volumes propan-1-ol nitric acid. Palladium used as a chemical modifier. Pyrolysis atomization temperatures well dilution factor were investigated optimized. Because no adequate certified...
Abstract Oxidation is the major cause of fat and oil deterioration which produces rancid unpleasant flavors that drastically reduces their quality nutritional value. The primary oxidation products are triacylglycerols (TAG) containing unsaturated fatty acyl hydroperoxides formed by a chain process occurring through free radical intermediates. Rancimat method currently gold standard for measuring oxidative stability oils fats. In this report, easy ambient sonic‐spray ionization mass...
Abstract Travelling‐wave ion mobility mass spectrometry was used to measure the intrinsic of a series gaseous supra‐cation and supra‐anion aggregates several ionic liquids. Close mobilities were observed in T‐wave cell filled with helium at ca. 0.8 mbar for [(DAI) n +1 (X) ] + (DAI is 1,3‐dialkylimidazolium cation X anion) as compared respective anions − =0 9. The anomalous behavior reported before condensed phase seems therefore be related unique structural organization pure liquids that...
Bioethanol is a strategic biofuel in Brazil. Thus, strong metrological basis for its measurements required to ensure the quality and promote exportation. Recently, Inmetro certified reference material water content bioethanol. This paper presents results of these studies. The characterization, homogeneity, short-term stability long-term uncertainty contributions values were 0.00500, 0.0166, 0.0355 0.0391 mg g-1, respectively. certificated value bioethanol fuel was (3.65 ± 0.11) g-1. CRM...
Quantificação e identificação de misturas biodiesel soja com petrodiesel foram realizadas via espectrometria massas utilizando duas técnicas ionização: electrospray (ESI) Venturi easy ambient sonic-spray em seu modo líquido (V L -EASI).Diferentes biodiesel/ (de B0 até B100) diluídas diretamente injetadas analisadas por ambas as técnicas.Para investigar a adulteração blendas Bn, óleo soja/biodiesel soja/petrodiesel analisadas.Curvas analíticas obtidas triplicata.As apresentaram quantificação...
It has been widely discussed in Brazil that the production of biodiesel should look for ways increasing competitiveness considering balance among economic growth, environmental quality and social well-being through rational use resources.The main purpose this paper is to identify structural dimensions influencing sustainability Brazilian chain and, thereby, contribute current debate as well process formulating policy strategies regarding important supply chain.As starting point, a number...
The objective of this study was to present a reliable and practical example method validation uncertainty assessment with an analytical for the determination polycyclic aromatic hydrocarbons (PAHs) in urban dust. gas chromatography–mass spectrometry combination isotope dilution principle achieve better accuracy results. performance parameters five PAHs were determined (phenanthrene, fluoranthene, benzo[a]anthracene, benzo[a]pyrene benzo[ghi]perylene); used key comparison CCQM-K50b...
The proficiency testing for determination of pesticides residues in mango pulp was the third work partnership established by INMETRO and INCQS/Fiocruz. Three samples were sent to each participant laboratory, two being spiked with one exempt pesticides. added were: deltamethrin, ethion, fenitrothion, malathion, permethrin. evaluation results homogeneity stability tests, as well assigned value made agreement ISO GUIDE 35 13528, assuming considered homogeneous stable studied period. values...
The present work describes the development of a certified reference material (CRM) composed solutions ethanol in water five different concentrations, and all stages necessary for an CRM, according to guidelines ISO GUIDES 30, 31, 32, 33, 34 35. this CRM has been determined by Inmetro Rule n. 006 2002, which requires that breath alcohol analyzers being used Brazil shall have their respective models approved subsequent verifications be performed based on tests with water. As result,...
pH is an important parameter to control the production of food, medicine, petrochemical products and others. Thus, standard reference materials used calibrate meters are necessary guarantee reliability measurements. The Chemical Metrology Division (Dquim) National Institute Brazil (Inmetro) has as one its missions certification materials. In case pH, it will be done by primary measurement system Inmetro, in operation at Dquim since 2003. buffer solution nominal value equal 6.865 first...
Abstract In recent years, biodiesel has gained considerable attention because of the increasing concern for environmental problems associated with use fossil fuels. The determination fuel quality is an issue great importance to successful commercialization biodiesel. According ASTM and EN standards, analysis free total glycerin, contaminants that can lead serious engine problems, must be carried out by GC analysis. This work presents alternative method identifying quantifying these major in...