Výsledky vyhledávání - "Hilda Costa dos Santos"

Multivariate calibration in Fourier transform infrared spectrometry as a tool to detect adulterations in Brazilian gasoline

Autor: Hilda Costa dos Santos, Leonardo S. G. Teixeira, Fábio Santos de Oliveira, Paulo Wilson Louzado Cordeiro, Selmo Queiroz Almeida

Publikováno v: Fuel. 87:346-352

In the present work, Fourier transform infrared spectroscopy (FTIR) in association with multivariate chemometrics classification techniques was employed to identify gasoline samples adulterated with diesel oil, kerosene, turpentine spirit or thinner.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f6b34476712a85339b1ed667793a90a9
https://doi.org/10.1016/j.fuel.2007.05.016

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The influence of Cu, Fe, Ni, Pb and Zn on gum formation in the Brazilian automotive gasoline

Autor: Luiz Antônio Magalhães Pontes, Eledir Vitor Sobrinho, Paulo Ricardo Bittencourt Guimarães, Hilda Costa dos Santos, Leonardo S. G. Teixeira, Jurema de Castro Souza, Regina Ferreira Vianna

Publikováno v: Fuel Processing Technology. 88:73-76

In this research work, the effect of different concentrations of copper, iron, lead, zinc and nickel ions on the tendency for gum formation in gasohol fuel is investigated. For that purpose, a gasohol sample has been doped with these five metals ions

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4761f18d91418951292e52252640f306
https://doi.org/10.1016/j.fuproc.2006.08.008

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Characterization and determination of the thermodynamic and kinetic properties of the adsorption of the molybdenum(VI)–calmagite complex onto active carbon

Autor: Hilda Costa dos Santos, Heloysa Martins Carvalho Andrade, Sergio Luis Costa Ferreira

Publikováno v: Journal of Colloid and Interface Science. 270:276-280

The extraction of the Mo(VI)-calmagite complex by adsorption onto active carbon is investigated in the present paper. Thermodynamic and kinetic properties and different adsorption isotherms were determined. The adsorption studies have shown that both

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c38f04762d1df7e15e2f40701720f823
https://doi.org/10.1016/j.jcis.2003.07.042

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Application of factorial designs and Doehlert matrix in optimization of experimental variables associated with the preconcentration and determination of vanadium and copper in seawater by inductively coupled plasma optical emission spectrometry

Autor: Sergio Luis Costa Ferreira, Hilda Costa dos Santos, Adriana S. Queiroz, Marcelo S. Fernandes

Publikováno v: Spectrochimica Acta Part B: Atomic Spectroscopy. 57:1939-1950

In the present paper a procedure for preconcentration and determination of vanadium and copper in seawater using inductively coupled plasma optical emission spectrometry (ICP OES) is proposed, which is based on solid-phase extraction of vanadium (IV)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::adb6f41e3e1e31bf57e6ff9efb8f5687
https://doi.org/10.1016/s0584-8547(02)00160-x

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Application of Doehlert matrix and factorial designs in optimization of experimental variables associated with preconcentration and determination of molybdenum in sea-water by inductively coupled plasma optical emission spectrometry

Autor: Marcelo S. Fernandes, Marcelo Souza de Carvalho, Hilda Costa dos Santos, Sergio Luis Costa Ferreira

Publikováno v: Journal of Analytical Atomic Spectrometry. 17:115-120

A simple and efficient procedure for the preconcentration and determination of molybdenum in sea-water was developed using solid-phase extraction (SPE) of molybdenum(V) ion as the thiocyanate complex by polyurethane foam and inductively coupled plasm

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::68197cfd20324fbf7e31cbd49a84781f
https://doi.org/10.1039/b109087a

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Microscopic and Chemical Characterization of Flour of Fruits: An Alternative Source for Supplemental Feeding

Autor: Ana Maria Pinto dos Santos, Rosemary Duarte Sales Carvalho, Ademir Evangelista do Vale, Uenderson Araujo Barbosa, Margareth da Silva Ribeiro, Jeane dos Santos Lima, Ivanice Ferreira dos Santos, Hilda Costa dos Santos, Clarissa Duarte Sales Carvalho

Publikováno v: Journal of Food Processing & Technology. 5

The present study aimed to characterization microscopic and chemical of four samples of fruit flours: eggplant (Solanum melongena), banana (Musa spp), passion fruit (Passiflora spp) and grape (Vitis vinifera). For the determination of chemical compos

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8b8857d9242cead213375b0252b4a9c0
https://doi.org/10.4172/2157-7110.1000386

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Molybdenum determination in iron matrices by ICP-AES after separation and preconcentration using polyurethane foam

Autor: Sergio Luis Costa Ferreira, Hilda Costa dos Santos, Djane Santiago de Jesus

Publikováno v: Scopus-Elsevier
Repositório Institucional da UFBA
Universidade Federal da Bahia (UFBA)
instacron:UFBA

Texto completo: acesso restrito. p. 187-190 Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2013-01-07T15:12:13Z No. of bitstreams: 1 Ferreira.pdf: 29396 bytes, checksum: 98a9c0d493bacef847534e56b0fb01f9 (MD5) Made available in DSpace on 2013

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f7100d81d0909837d4994a86b6adb2a
https://doi.org/10.1007/s002160000590

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Sensitive spectrophotometric determination of ascorbic acid in fruit juices and pharmaceutical formulations using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP)

Autor: Valfredo Azevedo Lemos, Sergio Luis Costa Ferreira, Djane Santiago de Jesus, A. C. Spinola Costa, Marcus L. S. F. Bandeira, Hilda Costa dos Santos

Publikováno v: Repositório Institucional da UFBA
Universidade Federal da Bahia (UFBA)
instacron:UFBA

Texto completo: acesso restrito. p.1174-1178 Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2013-02-01T14:36:54Z No. of bitstreams: 1 Ferreira.pdf: 60340 bytes, checksum: 0b548077e1008ac890d7af288c44b272 (MD5) Made available in DSpace on 201

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ec0086bacb913c2c06a330bf594cf476
https://doi.org/10.1007/s002160050326

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Analytical Methods

Autor: Neyla Margarida Lopo de Araújo, Sergio Luis Costa Ferreira, Marcos A. Bezerra, Djane Santiago de Jesus, Hilda Costa dos Santos

Publikováno v: Repositório Institucional da UFBA
Universidade Federal da Bahia (UFBA)
instacron:UFBA

p. 508-512 Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2014-08-26T12:43:02Z No. of bitstreams: 1 Neyla Margarida Lopo de Araújo.pdf: 313196 bytes, checksum: 717598325284b0bd7b2bbb26fe0b037e (MD5) Made available in DSpace on 2014-08-26T12

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ed199a60742fba05e3330d33fc5613d
http://repositorio.ufba.br/ri/handle/ri/15703

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Avaliação da presença de resíduos de tetraciclinas em amostras de mel comercializadas no estado da Bahia

Autor: Fernando Luiz Trindade Rêgo, Hilda Costa dos Santos, Gisele Vivas Tosta Aguiar Monteiro, Renata de Souza Guerreiro

Publikováno v: Repositório Institucional da UFBA
Universidade Federal da Bahia (UFBA)
instacron:UFBA

O mel é conhecido mundialmente como um produto natural, e sua imagem está diretamente associada à saúde. Entretanto, as colmeias de abelhas melíferas estão sujeitas a doenças, como a Cria Pútridas Americana (CPA) e Europeia (CPE) e a Varroato

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::005661c7396cb81c02a817e482d3e1a5
http://repositorio.ufba.br/ri/handle/ri/22726

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