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Desenvolvimento de um processo de separação de emulsão com o uso de radiação microondas para a caracterização de petróleo extrapesado
(Universidade Federal de Santa Maria, 2009-04-17)
In this work is proposed a procedure for separation in laboratory scale of extra-heavy
crude oil emulsions with high dissolved water and salt content, using microwave radiation in
a closed system. The emulsion was ...
Emprego de ultrassom para a oxidação e separação de compostos orgânicos sulfurados em hidrocarbonetos e determinação de enxofre por técnicas espectrométricas e cromatográficas
(Universidade Federal de Santa Maria, 2009-04-13)
In this work, a process based on ultrasonic energy for sulfur removal from
petroleum fractions was proposed. The process combines ultrasonic energy and a
peroxyacid reagent in order to achieve the required sulfur content ...
Eletrodos modificados e não modificados na determinação de compostos sulfurados - um estudo comparativo
(Universidade Federal de Santa Maria, 2004-11-19)
The present study is a contribution for the electrochemical determination of the thiocompounds in aqueous solutions. The performance of different electrode surfaces as well as the introduction of modifiers in the electrolyte ...
Cefalosporinas e surfactante não-iônico em efluente hospitalar: determinação, degradação por meio de fotólise e eletrocoagulação e identificação de subprodutos e metabólitos
(Universidade Federal de Santa Maria, 2009-04-06)
The currently incorrect and excessive consumption of pharmaceuticals and surfactants, mainly domestic usage, has become a concern to the scientific community around the world, due to the environmental consequences with ...
Determinação de elementos-traço em amostras de nitreto de alumínio e nitreto de silício por análise direta de amostras sólidas em espectrometria de absorção atômica com forno de grafite
(Universidade Federal de Santa Maria, 2008-03-28)
A graphite furnace atomic absorption spectrometry method using direct
solid sampling has been developed for the determination of Cr, Cu, Fe, K, Mn, Sb
and Zn in powdered AlN and Si3N4. Owing to the vaporization of AlN ...
Estudo fitoquímico da raiz da espécie Melochia chamaedrys St. Hil
(Universidade Federal de Santa Maria, 2005-11-04)
Melochia chamaedrys St.Hil. is a plant that is locally known as douradinha , it is found in South America, more exactly in the south of Brazil, Argentina, and Uruguay. In the state of Rio Grande do Sul , the species M. ...
Síntese de 2-alquinil telurofenos via reação de sonogashira entre 2-halotelurofeno e 1-alcinos
(Universidade Federal de Santa Maria, 2006-05-29)
We present herein our results of the palladium-catalyzed cross-coupling of 2-halotellurophenes with several terminal alkynes to give acetylenic tellurophene
derivatives in excellent yields. Our initial efforts were devoted ...
Antimicrobial ciprofloxacina em efluente hospitalar: exposição ambiental, avaliação de risco e degradação através de processos avançados de oxidação
(Universidade Federal de Santa Maria, 2006-09-01)
In the present study, the presence of the antimicrobial ciprofloxacin (CIP) in effluent from the first-aid clinic of the University Hospital of Santa Maria (PA-HUSM) and its degradation by advanced oxidation processes ...
Síntese e estudo das interações de 3-(fosfato)- e 3-(fosfonamida)-4,4,4-trifluor-but-1-il-carbamatos de etila com a enzima acetilcolinesterase e síntese de 3-carboxietil- e 3-pirimidin-2-il-2-oxo-6-trifluormetil-[1,2,3]oxatiazinanas
(Universidade Federal de Santa Maria, 2007-03-01)
A series of [3-(phosphate)-4,4,4-trifluoro-but-1-yl]-carbamic acid ethyl ester and [3-(phosphonamide)-4,4,4-trifluoro-but-1-yl]-carbamic acid ethyl ester obtained from the reaction of g-amino alcohols (4,4,4-trifluoro-3- ...
Síntese e atividade biológica de furan-3-carboxamidas, 3-aminometilenodiidrofuran-2-onas e carbamatos de etila trialometilados
(Universidade Federal de Santa Maria, 2007-03-02)
The present work describes the synthesis of a new series of furan-3-carboxamides and 3-aminomethylenedihydrofuran-2-ones, through the reactions of 3-trichloroacetyl furan or furan-3-carbonyl chloride, and 3-trichloroacet ...