Aqueous Ammonia
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. Arsenic and Other Elements Determination in Seawater Using Coprecipitation and Standard Mode Inductively Coupled Plasma Mass Spectrometry
The present work aims the determination of As, Co, Cr, Cu, Mn and Pb in seawater samples using coprecipitation extraction procedure before standard mode inductively coupled plasma mass spectrometry (ICP-MS) (no collision/reaction cell). The coprecipitation procedure is based on the precipitation of Mg(OH)2 from the reaction of the Mg2+ ions (present into the
J. Braz. Chem. Soc.. Publicado em: 2021-01
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2. The Role that Electrolytes Play in the Synthesis of Water-Soluble CdTe Quantum Dots Prepared at Ambient Temperature
In this work, we have synthesized CdTe quantum dots (QDs) dispersed in an aqueous medium at ambient temperature, and investigated their optical properties. Synthesis of CdTe QDs in the presence of simple amines removed the need for an additional energy source and inert atmosphere, in a simple and inexpensive experimental setup. The use of ammonia or hydrazin
J. Braz. Chem. Soc.. Publicado em: 2017-07
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3. Potential of ethyl acetate fractions of Stryphnodendron adstringens shells and fruit extracts of Caesalpinia ferrea to control bacterial leaf speck and on the potentiation of defense enzymes in tomato
Considering the importance of bacterial leaf speck (Pseudomonas syringae pv. tomato) in reducing tomato yield and difficulties in disease control, this study investigated the effects of fractions of shells extract of Stryphnodendron adstringens (Sa) and fruit extract of Caesalpinia ferrea (Cf) compared to Acibenzolar-S-Methyl (ASM) on reducing bacterial leaf
Trop. plant pathol.. Publicado em: 2014-08
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4. Synthesis of zinc aluminate (ZnAl2O4) spinel and its application as photocatalyst
ZnAl2O4 spinel was synthesized by co-precipitation using ammonia as precipitating agent, followed by thermal treatment at 750 ºC. The structural properties of particles were investigated by X-ray diffraction (XRD), atomic force microscopy (AFM), differential thermal analysis (DTA), and N2 adsorption/desorption isotherms (BET) techniques. The photocatalytic
Mat. Res.. Publicado em: 30/05/2014
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5. Pré-tratamento do bagaço de cana de açúcar com amônia aquosa para a produção de etanol
O objetivo deste trabalho foi avaliar a etapa de pré-tratamento do bagaço de cana de açúcar empregando amônia aquosa, um método alcalino. Amostras de bagaço (in natura e explodido a vapor não lavado) foram tratadas na proporção 1:5 (massa de bagaço seco por massa de solução de NH4OH), em escala de bancada. Ensaios preliminares foram realizados e
Publicado em: 2011
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6. Novel synthesis of primary arylamides from aryl methyl ketone oxidations using iodine in aqueous ammonia
Arilamidas primárias foram obtidas em bons rendimentos quando diversas arilmetilcetonas foram tratadas com iodo em amônia aquosa a temperatura ambiente.
Journal of the Brazilian Chemical Society. Publicado em: 2010
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7. AvaliaÃÃo da qualidade do sedimento do estuÃrio do rio Cearà / Quality evaluation of the estuary sediment of the river Ceara
The evaluation of sediment quality has been seen as a consistent and necessary extension of assessment programmes for water resources. Sediments are the most concerning of the compartments due characteristics that favour the deposition and accumulation of contaminants. Previous studies showed that the estuary of Cearà River is suffering contamination by ind
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2008
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8. INFLUÊNCIA DA AMÔNIA E OXIGÊNIO DA ÁGUA IN VIVO E DA ERVA-MATE EX VIVO SOBRE A ESTABILIDADE LIPÍDICA DE FILÉS DE DOURADO / INFLUENCE OF AMMONIA AND OXYGEN OF WATER IN VIVO AND THE ERVA-MATE EX VIVO ON LIPID STABILITY LIPÍDICA OF FILLETS FROM DOURADO
This work was aimed at evaluating the effect of the exposure to stressing ammonia and oxygen levels in vivo as well as the effect of the treatment with erva-mate extract (Ilex paraguariensis) post mortem on the lipid stability of fillets of dourado (Salminus brasiliensis). The influence of different levels of ammonia and oxygen on the proximate composition,
Publicado em: 2008
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9. Desenvolvimento de catalisadores de óxido de ferro ou óxido de zirconio sulfatado para a redução de óxidos de nitrogênio com propano.
Nitrogen oxides are responsible for the three of the main phenomena related global pollution. The photochemical smog, the acid rain and the pollution of continental water by nitrate species, as well as the greenhouse effect, are related to nitrogen compounds. In the last decades several technologies have been proposed and used to reduce the emissions of nitr
Publicado em: 2004
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10. Efeito das condições de preparação sobre as propriedades do óxido de zircônio sulfatado contendo ferro.
Sulfated oxide-based catalysts have found several industrial applications mainly in reactions which demand for strong acid sites. In order to develop methods to get acidic oxides, the effect of the preparation methods on the properties of iron-doped zirconia oxides was studied in this work.The precursors were prepared by process sol-gel from iron nitrate and
Publicado em: 2004
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11. Obtenção de novos materiais pelo processo sol-gel : oxidos e fosfatos de ferro
Thermal and hydrotermal transformations of non-crystalline iron (III) hydroxoacetate (HAF), hydroxophosphate (HPF) and metaphosphate (MPF) were followed using these methods: iron (II) and total-iron determinations; infrared spectrophotometry; surface area and density measurements; Mössbauer, (VIS-UV) photoacoustic and electron spin resonance spectroscopies;
Publicado em: 1990
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12. Avoidance of sulfur loss during ammonia treatment of oligonucleotide phosphorothioates.
Sulfur loss during the unblocking of phosphorothioate analogues of oligonucleotides with concentrated aqueous ammonia can be completely suppressed by the addition of 2-mercaptoethanol.