Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Vera L. A. Frescura"'
Autor:
Paula Cristiana de Freitas, Rui Miguel de Carvalho, Jessee Severo Azevedo Silva, Thiago Prado, Elis Regina Duarte, Vera L. A. Frescura, Eduardo S. Chaves
Publikováno v:
Química Nova, Vol 38, Iss 4, Pp 570-574 (2015)
A simple procedure for ultrasound-assisted extraction and colorimetric determination of iron in soil samples was developed. The iron concentration in the analyzed samples was determined by the colorimetric method and the results compared with inducti
Externí odkaz:
https://doaj.org/article/faa1d0db83b74e50bd59703127a4a4ae
Autor:
Jessee A. S. Silva, Fernando J. S. Oliveira, Jocinei Dognini, Eliana Flávia Camporese Sérvulo, Daniele M. F. Azevedo, Vera L. A. Frescura
Publikováno v:
Journal of Environmental Science and Health, Part A. 54:686-693
The aim of this work is to evaluate the rare earth elements (REEs) recovery from fluid catalytic cracking spent catalyst (FCC-SC) by chemical and biochemical strategies while also examining a route for the valorization of biodiesel-derived glycerin (
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::54ccf13ed81f4e8866f15a44d4ed46b3
https://doi.org/10.1080/10934529.2019.1579539
https://doi.org/10.1080/10934529.2019.1579539
Autor:
Tatiane de A. Maranhão, Vera L. A. Frescura, Daniel L. G. Borges, Leticia Cristina Radin Pereira
Publikováno v:
Journal of Analytical Atomic Spectrometry. 34:1932-1941
This work focused on the evaluation of extraction protocols using convective heating and HNO3 or HCl solutions regarding their performance towards fractionation analysis of mercury (inorganic and organic fractions) in oily sludge samples using cold v
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7419db7d8ce9f2ced08d77a95de27044
https://doi.org/10.1039/c9ja00179d
https://doi.org/10.1039/c9ja00179d
Autor:
Vera L. A. Frescura, Waldemar de Oliveira Pacheco Filho, Fernando J. S. Oliveira, Tatiane de A. Maranhão, Adriana Simane Camera, Patrícia Passos Arcênio
Publikováno v:
Microchemical Journal. 134:301-308
Development and validation of a method for determination of sulfur via CS molecule in petroleum green coke samples by high resolution continuum source molecular absorption spectrometry (HR-CS MAS) is the aim of this work. The protocol adopted for the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b4e05f909d6eaa9e507b1285a8e83c51
https://doi.org/10.1016/j.microc.2017.06.022
https://doi.org/10.1016/j.microc.2017.06.022
Autor:
Paula M.A. Machado, Leonardo M. Lube, D. R. Sanchez, Vera L. A. Frescura, Marcione D.E. Tiradentes, Christiane Fernandes, Lorenzo do Canto Visentin, Adolfo Horn, Rosane A. S. San Gil, Alexandre M. Stumbo, Jessee S. A. Silva, Clícia Azeredo Gomes
Publikováno v:
Applied Catalysis A: General. 507:119-129
This work deals with the synthesis and characterization of two homogeneous and three heterogeneous iron(III) catalysts, which were evaluated in the oxidation of cyclohexane and cyclohexene, using H2O2 as oxidant. The homogeneous catalyst [Fe2(BPA)2(
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bcca4ef53461a4c8539c18b4fa4446e6
https://doi.org/10.1016/j.apcata.2015.09.035
https://doi.org/10.1016/j.apcata.2015.09.035
Publikováno v:
Analytica Chimica Acta. 717:21-27
A fast method for the determination of As, Co, Cu, Fe, Mn, Ni, Se and V in biological samples by ETV-ICP-MS, after a simple sample treatment with formic acid, is proposed. Approximately 75mg of each sample is mixed with 5mL of formic acid, kept at 90
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46d17a44158af0a170389d7d728c2736
https://doi.org/10.1016/j.aca.2011.12.030
https://doi.org/10.1016/j.aca.2011.12.030
Autor:
Ingrid M. Dittert, Rennan Geovanny Oliveira Araujo, Adilson J. Curtius, Luciano Tormen, Daiane Placido Torres, Vera L. A. Frescura
Publikováno v:
Journal of Food Composition and Analysis. 24:95-102
A simple and fast method for the determination of Ca, Cd, Co, Cu, Fe, Mn, Mo, Na, Ni, Pb, Rb, Sr, V and Zn in fruit juices samples, by inductively coupled plasma mass spectrometry (ICP-MS) after only a sample dilution, is proposed. For comparison, th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::541a9616f7a69525e35ca6123e99db4e
https://doi.org/10.1016/j.jfca.2010.06.004
https://doi.org/10.1016/j.jfca.2010.06.004
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 65:959-966
A simple and fast method for the determination of As, Ba, Cd, Co, Cu, Fe, Ga, Mn, Mo, Ni, Pb, Rb, Se, Sr, Tl, U, V and Zn in biological samples by inductively coupled plasma mass spectrometry (ICP-MS), after sample solubilization with formic acid and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cbfb0c3a2b17915f0182f0c720da1a00
https://doi.org/10.1016/j.sab.2010.09.007
https://doi.org/10.1016/j.sab.2010.09.007
Autor:
José Vladimir Oliveira, Adilson J. Curtius, Éder José dos Santos, Vera L. A. Frescura, Rennan Geovanny Oliveira Araujo, Eduardo S. Chaves
Publikováno v:
Microchemical Journal. 96:71-76
Methods for the determination of 5 major (Ca, K, Mg, Na and P) and 14 minor elements (Al, Ba, Cd, Co, Cu, Fe, Ga, Mn, Mo, Ni, Pb, Rb, Sr and Zn) in vegetable seeds by ICP OES and by ICP-MS, respectively, are proposed. After a common sample preparatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7fd2de03e082e5a9a36feee19da89ccc
https://doi.org/10.1016/j.microc.2010.01.021
https://doi.org/10.1016/j.microc.2010.01.021
Autor:
Ingrid M. Dittert, Adilson J. Curtius, Daiane Placido Torres, Vera L. A. Frescura, Heinrich Höhn
Publikováno v:
Microchemical Journal. 96:32-36
A simple method for the determination of mercury in gasoline samples diluted with ethanol by graphite furnace atomic absorption spectrometry (GF AAS) after cold vapor (CV) generation, pre-concentration in a gold column and trapping on a graphite tube
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::43a0f2704067f22501188e4dd9203a5c
https://doi.org/10.1016/j.microc.2010.01.011
https://doi.org/10.1016/j.microc.2010.01.011