Zobrazeno 1 - 8
of 8
pro vyhledávání: '"Sonia Regina Giancoli Barreto"'
Publikováno v:
Semina: Ciências Exatas e Tecnológicas, Vol 32, Iss 2, Pp 181-190 (2011)
In this study, we used the reports of classroom observation as a research tool, serving as a tool for research on initial teacher training in chemistry. The study analyzed 12 reports prepared by students of Degree in Chemistry and to discuss through
Externí odkaz:
https://doaj.org/article/d3b1f311b9ad4e13835b1804e04b7c02
Autor:
Wagner José Barreto, Sonia Regina Giancoli Barreto, Ieda Spacino Scarminio, Dílson Norio Ishikawa, Miriam de Fátima Soares, Marcus Vinícius Brás de Proença
Publikováno v:
Química Nova, Vol 33, Iss 1, Pp 109-113 (2010)
A spectrophotometric method was proposed for Ni(II) determination in alloys using a dopa-semiquinone (L-1) to form [Ni(II)(L1-)3]1-, ε = 9.3 x 10³ L mol-1 cm-1. The optimal conditions for the determination were: wavelength 590 nm, temperature 25 °
Externí odkaz:
https://doaj.org/article/786a3de10e3642c492ed25423d347840
Publikováno v:
Semina: Ciências Exatas e Tecnológicas, Vol 32, Iss 2 (2011)
Neste estudo, foram utilizados os relatórios de observação de aulas como ferramenta de pesquisa, servindo de instrumento para se investigar sobre formação inicial de professores de química. O estudo consistiu em analisar 12 relatórios, elabora
Externí odkaz:
https://doaj.org/article/b96df8269c4c42a289cd5812dc82c1a5
Autor:
Wagner José Barreto, Herica Aparecida Magosso, Miriam Fátima Soares, Bruno Marco Oliveira Silveira, Ieda Spacino Scarminio, Dílson Norio Ishikawa, Sônia Regina Giancoli Barreto
Publikováno v:
Eclética Química, Vol 36, Iss 3, Pp 15-20 (2018)
A simple and sensitive UV-Vis spectrophotometric method was developed using a new chromogenic reagent, L-dopasemiquinone, for the quantification of Ni(II) in metallic alloys: Inox, Co-Cr, and Ni-Ti. The complex [Ni(II)(L1-)3]1- presents an intense ba
Externí odkaz:
https://doaj.org/article/4cf8d4288eae43d5a0697c00496483bb
Autor:
Bruna Fabrin Somera, Fernanda Midori de Oliveira, Wagner José Barreto, Sônia Regina Giancoli Barreto, César Ricardo Teixeira Tarley
Publikováno v:
Química Nova, Vol 35, Iss 8, Pp 1600-1605 (2012)
The present study proposes a method for cloud point preconcentration of copper ions at pH 2.0 based on complexes formed with [4,5-dimercapto-1,3-dithyol-2-thionate] and subsequent determination by flame atomic absorption spectrometry (FAAS). Under op
Externí odkaz:
https://doaj.org/article/525dec0331e643d59cf21f079c754d0c
Autor:
Dílson Norio Ishikawa, Renata Zacarias Noale, Thiago Hideyuki Kobe Ohe, Eloana Benassi Ribeiro de Souza, Ieda Spacino Scarmínio, Wagner José Barreto, Sônia Regina Giancoli Barreto
Publikováno v:
Química Nova, Vol 32, Iss 7, Pp 1744-1749 (2009)
The proposal of this study was to obtain the profile of these metals distribution Al, Co, Cu, Pb, Cr, Ni, Co and Zn in sediments from lakes in the city of Londrina-PR and evaluate the environmental risk resulting from such distribution. The parameter
Externí odkaz:
https://doaj.org/article/4bce4f2709f24292bcf77df4067529c9
Publikováno v:
Química Nova, Vol 29, Iss 6, Pp 1255-1258 (2006)
The reaction of 1,2-dihydroxy-benzene (pyrocatechol) (C6H6O2) with iron oxide (Fe2O3) and sodium thiosulfate (Na2S2O3) in aqueous medium (pH 7) was investigated. Pyrocatechol suffers autoxidation and coordinates with Fe3+ in solution. The presence of
Externí odkaz:
https://doaj.org/article/c798d14c11ec4ada8d74fa3a70496866
Autor:
Boroski, Marcela
Publikováno v:
Repositório Institucional da Universidade Estadual de Maringá (RI-UEM)
Universidade Estadual de Maringá (UEM)
instacron:UEM
Universidade Estadual de Maringá (UEM)
instacron:UEM
The aim of the present work is to treat two distinct matrices effluent whose wastewater usually promote natural water pollution: effluent proceeding from an industty of paper and pulp, and from industry of pharmaceutical and cosmetics, through two co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______3056::bc5d388589de362eec683259aca5ecec
http://repositorio.uem.br:8080/jspui/handle/1/3882
http://repositorio.uem.br:8080/jspui/handle/1/3882
