Buscar
Itens para a visualização no momento 121-130 of 160
Determinação de cloreto por cromatografia de íons em petróleo extrapesado, coque e resíduo de vácuo após decomposição em sistema fechado por combustão iniciada por microondas
(Universidade Federal de Santa Maria, 2007-07-27)
A method for chloride determination in heavy crude oil, petroleum coke and vacuum residue after microwave-induced combustion (MIC) in closed vessels is described. Samples (with exception of petroleum coke) were wrapped ...
Determinação do número de acidez total em resíduo de destilação atmosférica e de vácuo do petróleo empregando a espectroscopia no infravermelho (ATR-FTIR) e calibração multivariada
(Universidade Federal de Santa Maria, 2007-12-14)
The crude oil might contain a series of contaminants that can to produce undesired properties. Naphthenic acids (NA), for example, perhaps promotes corrosion in refineries. The determination of total acid number (TAN) in ...
Determinação de enxofre em petróleo pesado resíduo de vácuo e coque por ICP OES após combustão iniciada por microondas em sistema fechado
(Universidade Federal de Santa Maria, 2007-07-31)
In this work was proposed a microwave induced combustion procedure in closed vessels for decomposition of heavy crude oil, vacuum residue and coke for further sulfur determination by inductively coupled plasma optical ...
Decomposição de elastômeros por combustão iniciada por microondas em sistema fechado
(Universidade Federal de Santa Maria, 2006-07-28)
A rapid digestion procedure for further determination of inorganic elements in carbon black-containing elastomers has been developed using sample combustion in closed quartz vessels with oxygen pressure. Microwave radiation ...
Investigação sobre a formação de espécies de arsênio orgânico em soluções de nutrição parenteral
(Universidade Federal de Santa Maria, 2006-06-21)
Parenteral nutrition is the nutrients administration by intravenous mean in patients who cannot consume them for gastrointestinal way. Parenteral Nutrition Solutions are stored in glass and plastic containers, being the ...
Desenvolvimento e validação de método multirresíduo para determinação de pesticidas em arroz polido utilizando método QuEChERS modificado, clean-up dispersivo e GC-MS (NCI-SIM)
(Universidade Federal de Santa Maria, 2007-03-01)
The rice is the main component of the basic diet of the world-wide population, is therefore, of extreme importance for the food security. In function of this, related aspects its production and comsumption must continuously ...
Investigação de propriedades no estado sólido de triazenos simétricos 1,3-diarilsubstituídos e complexos com Co(III) e Cu(II) com o ligante 1,3-bis(4-metoxicarbonilfenil)triazenido
(Universidade Federal de Santa Maria, 2007-08-13)
In this work it was synthesized and determinate the crystalline/molecular structure of two pré ligands triazene simetric: 1,3−bis−(4−acethylamidephenyl)triazene
[H3CC(O)NHC6H4NNNC6H4NH(O)CCH3] (1) e o 1,3−bis−(4−ethoxic ...
Sulfoximidovinil trifluormetil cetonas. Obtenção e aplicação na síntese de azóis e azinas derivadas
(Universidade Federal de Santa Maria, 2007-07-02)
This work describes the synthesis of a new series of 4-alkyl(aryl)-4-tetramethylenesulfoximide-1,1,1-trifluorobut-3-en-2-ones (5a-k) by the O,N-exchange reactions of ketones (1a-k) [CF3C(O)CH=CR1R, where R = OMe, OEt; R1 ...
Síntese de 1,2,4-triazol-5-ilamino pirimidinas trifluormetil substituídas
(Universidade Federal de Santa Maria, 2009-12-16)
This work describes the synthesis and characterization of fourteen 4-trifluoromethyl-2-[3-(pyridyl)-1H-1,2,4-triazol-5-ylamino]pyrimidines (6, 7), from the cyclocondensation
reaction of N-[3-(pyridyl)-1H-1,2,4-triazol-5 ...
Síntese e cristaloquímica de complexos de Hg(II) e Ni(II) com o ligante 3-(2-fluorofenil)-1-(4-acetilfenil)triazenido e atividade biológica de triazenos livres
(Universidade Federal de Santa Maria, 2006-07-26)
In this dissertation were synthesized six compounds, of the which four are free triazene ligands and two
are triazenido complex of Hg(II) and Ni(II). The compouns were characterized by melting point, infrared an
UV/VIS ...