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Itens para a visualização no momento 11-20 of 81
Decomposição de amostras botânicas e leite em pó utilizando peróxido de hidrogênio em sistema de alta pressão e posterior determinação elementar por ICP OES e ICP-MS
(Universidade Federal de Santa Maria, 2016-06-28)
Recently, there is an appeal to reduce the use of toxic reagents in a great effort for the development of analytical "green" methods. Thus, the paper proposes the elemental analysis of botanical and food samples without ...
Síntese de 1,7-fenantrolinas e 7-aminoquinolinas trifluormetil substituídas
(Universidade Federal de Santa Maria, 2010-02-26)
This work, at first, describes the synthesis and characterization of new series of (Z,Z)-N,N -bis(oxotrifluoroalkenyl)-1,3-phenylenediamines by the addition/elimination reaction of β-alkoxyvinyl trifluoromethyl ketones ...
Síntese e estereoquímica de isoxazóis espiro-tetracíclicos trifluormetil substituídos
(Universidade Federal de Santa Maria, 2017-02-23)
The present dissertation initially describes methodologies for the synthesis of five 3-(trifluoromethyl)-3,3a-dihydrospiro[chromeno[4,3-c]isoxazole-4,1'-cycloalkan]-3-ols (7) in 65 – 84 % yields, where the spirocarbocyclic ...
Determinação de elementos do grupo da platina em carvão com alto teor de cinzas por ICP-MS
(Universidade Federal de Santa Maria, 2017-06-03)
In this work a method for the digestion of high ash content coal (>30%) using a high
pressure asher (HPA) system for further determination of platinum group elements
(PGEs) by inductively coupled plasma mass spectrometry ...
Síntese de pirrolocumarinas via nitroestirenos e de novos selenetos derivados da cumarina
(Universidade Federal de Santa Maria, 2017-03-08)
This work describes the synthesis of pyrrolo[3,2-c]coumarins from 4-aminophenylcoumarins and nitrostyrenes (17 examples), which were obtained in yelds between 6 and 76 % in a reaction catalised by PTSA.H2O and under ...
Avaliação do comportamento de espécies de mercúrio em peixes após diferentes métodos de cocção
(Universidade Federal de Santa Maria, 2011-03-22)
Most of studies evaluating Hg in fish have been developed using fresh fish and
the few studies involving the assessment of Hg in fish after cooking process, involve
only the determination of total Hg and no clear conclusions ...
Avaliação de métodos de preparo de amostras para a determinação de cloro em temperos
(Universidade Federal de Santa Maria, 2012-05-24)
In this study, sample preparation methods were evaluated for the
determination of chlorine by ion chromatography (IC) in spice samples. The
microwave-induced combustion method (MIC) was tested using certified ...
Reações de enonas trialometilsubstituídas com aminas e diaminas: Síntese de análogos do etambutol
(Universidade Federal de Santa Maria, 2010-02-24)
A series of 5,5,5-trifluoro-3-methyl-(alkylmethylamino)-pentane-1,4-diols, 5,5,5-trifluoro-3-methyl-(arylmethylamino)-pentane-1,4-diols and N,N-bis[5,5,5-
trifluoro-3-methyl-(alkylmethylamino)]-pentane-1,4-diols were ...
Determinação de elementos traço em solo por ICP-MS após volatilização empregando combustão iniciada por micro-ondas
(Universidade Federal de Santa Maria, 2011-03-22)
In this work the microwave-induced combustion (MIC) method was proposed for the decomposition of soil samples and subsequent determination of As, Bi, Cd, Hg, Pb and Se by inductively coupled plasma mass spectrometry (ICP-MS). ...
Síntese de β-Calcogenoaminas quirais via abertura regiosseletiva de Aziridinas em Líquidos Iônicos.
(Universidade Federal de Santa Maria, 2011-07-29)
The present work report the synthesis of β-chalcogen amino compounds derived from L-aminoacids. The desired products were obtained in a short reaction time, with high yields using a simple and environmentally friendly ...