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Itens para a visualização no momento 81-90 of 119
Combustão iniciada por microondas e determinação em linha de cádmio e chumbo em plantas por espectrometria de absorção atômica com tubo aquecido na chama
(Universidade Federal de Santa Maria, 2007-02-07)
In this work a new procedure is proposed by solid sampling flame furnace atomic absorption spectrometry after microwave induced combustion (MIC-FFAAS). The procedure was applied for the determination of cadmium and lead ...
Síntese e cristaloquímica de complexos de Hg(II) e Ni(II) com o ligante 1,3-BIS(4-bromofenil)triazenido
(Universidade Federal de Santa Maria, 2006-03-01)
Deprotonated 1,3-Bis(4-bromophenyl)triazene reacts with Hg(CH3COO)2 in methanol yielding [Hg(BrC6H4NNNC6H4Br)2]∞ (1) a triazenide complex polymer of Hg(II). The crystal
structure of (1) reveals one-dimensional infinite ...
Determinação de espécies de arsênio por LC-ICP-MS
(Universidade Federal de Santa Maria, 2006-07-28)
The development of a method for As speciation in aqueous by-product of pyrolysis process of foliate bituminous is described in the present work. Arsenic species are separated by liquid chromatography (LC) coupled to ...
Síntese e análise estrutural de novos dihaloorganoteluratos(II) monoaniônicos.
(Universidade Federal de Santa Maria, 2006-02-17)
In this dissertation the synthesis and structural characterization of the new series of monoanionic dihaloorganyltellurates(II) compounds with a general formula (C5H6N)[mesTeX2] is presented. Dimesitylditelluride (mesTe)2 ...
Síntese de 2-amino(alcoxi)-5-trifluoracetil-1,2,3,4-tetraidropiridinas e oxazolo[3,2-a]piridinas
(Universidade Federal de Santa Maria, 2006-07-03)
The present work describes the synthesis of novel 2-alkoxy-5-trifluoroacetyl-1,2,3,4-tetrahydropyridines, 2-amino-5-trifluoroacetyl-1,2,3,4-tetrahydropyridines and oxazolo[3,2-a]pyridines from the cyclocondensation reactions ...
Determinação de cádmio e chumbo em sangue por espectrometria de absorção atômica com tubo aquecido na chama após combustão iniciada por microondas
(Universidade Federal de Santa Maria, 2007-07-25)
In this work a procedure for Cd and Pb determination by solid sampling flame furnace atomic absorption spectrometry after microwave induced combustion (MIC-FF-AAS) is used. Human blood samples were priory lyophilized, ...
Degradação de nonilfenol polietoxilado e de efluente têxtil por meio de eletrocoagulação e processos Fenton
(Universidade Federal de Santa Maria, 2004-07-29)
Nonylphenol polyethoxylates are nonionic surfactants widely
employed on textile industry. Submitted to inadequate effluent treatment processes, these compounds can be eventually biodegraded to metabolites with estrogenic ...
Combustão iniciada por microondas em sistema fechado para a decomposição de amostras biológicas
(Universidade Federal de Santa Maria, 2004-05-24)
A procedure for sample decomposition was proposed in this study based on sample combustion assisted by microwave radiation. Combustion is started by microwave radiation in the presence of oxygen under pressure using ammonium ...
Síntese de 3-arilselenofenos via reações de acoplamento de suzuki entre 3-iodoselenofenos e ácidos borônicos
(Universidade Federal de Santa Maria, 2008-01-25)
Não foi possível inserir o abstract.
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 ...