Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Costa Antônio Celso S"'
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 15, Iss 1, Pp 153-157 (2004)
A spectrophometric method for the determination of Cr(III) with 4-(2- thiazolylazo)-resorcinol was developed. Cr(III) slowly forms a red complex with TAR at pH 5.7. Irradiating the reacting mixture with microwave energy can accelerate the complex for
Externí odkaz:
https://doaj.org/article/ef2b5bca58c64bc5af65f7c1d426f602
Autor:
Santos, Wagna Piler C. Dos, Gramacho, Diogenes R., Teixeira, Alete P., Costa, Antônio Celso S., Korn, Maria das Graças A.
Publikováno v:
Journal of the Brazilian Chemical Society v.19 n.1 2008
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ
Journal of the Brazilian Chemical Society, Volume: 19, Issue: 1, Pages: 1-10, Published: 2008
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ
Journal of the Brazilian Chemical Society, Volume: 19, Issue: 1, Pages: 1-10, Published: 2008
In this work, the optimization of a fast and inexpensive acid wet digestion procedure for beans was developed. Essential (Ca, Cu, Fe, K, Mg, Mn, Ni, P, Zn) and non-essential (Al, Ba, Sr) elements were determined in beans degestates by inductively cou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::935f4fe411838237cc1493f7a405aa6b
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000100002
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000100002
Autor:
Carvalho, Luciene S. de, Costa, Antônio Celso S, Ferreira, Sérgio L. C, Teixeira, Leonardo S. G
Publikováno v:
Journal of the Brazilian Chemical Society v.15 n.1 2004
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ
Journal of the Brazilian Chemical Society, Vol 15, Iss 1, Pp 153-157 (2004)
Journal of the Brazilian Chemical Society, Volume: 15, Issue: 1, Pages: 153-157, Published: FEB 2004
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ
Journal of the Brazilian Chemical Society, Vol 15, Iss 1, Pp 153-157 (2004)
Journal of the Brazilian Chemical Society, Volume: 15, Issue: 1, Pages: 153-157, Published: FEB 2004
A spectrophometric method for the determination of Cr(III) with 4-(2- thiazolylazo)-resorcinol was developed. Cr(III) slowly forms a red complex with TAR at pH 5.7. Irradiating the reacting mixture with microwave energy can accelerate the complex for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::98f3b9d758f9344aed91a77f4a1b0f6c
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532004000100025
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532004000100025
Akademický článek
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Autor:
Santos Júnior Aníbal de Freitas, Korn Maria das Graças Andrade, Jaeger Helena Valli, Silva Nívia Maria Silveira, Costa Antonio Celso Spínola
Publikováno v:
Química Nova, Vol 25, Iss 6b, Pp 1086-1090 (2002)
The aim of this work was to explore the possibility of the application of a non-ionic resin obtained by impregnation of Alizarin Red S (VAS) in Amberlite XAD-7 for manganese, copper and zinc separation and preconcentration in saline matrices. For the
Externí odkaz:
https://doaj.org/article/264cd0463989459dbb45fdb9f6104250
Autor:
Teixeira Leonardo Sena Gomes, Costa Antonio Celso Spínola, Ferreira Sérgio Luís Costa, Freitas Maria de Lourdes, Carvalho Marcelo Souza de
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 10, Iss 6, Pp 519-522 (1999)
A sensitive and selective spectrophotometric method is proposed for the rapid determination of uranium using 2-(2- Thiazolylazo)-p-Cresol (TAC). The reaction between TAC and uranium (VI) is instantaneous at pH 6.5 and the absorbance remains stable fo
Externí odkaz:
https://doaj.org/article/07897d7a1e6245258e6a03a61b403081
Autor:
Korn Maria das Graças Andrade, Ferreira Adriana Costa, Teixeira Leonardo Sena Gomes, Costa Antonio Celso Spínola
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 10, Iss 1, Pp 46-50 (1999)
A sensitive and selective spectrophotometric method is proposed for the rapid determination of zinc(II) using an 8-hydroxyquinoline derivative, 7-(4-nitrophenylazo)-8-hydroxyquinoline-5-sulfonic acid (p-NIAZOXS), as a new spectrophotometric reagent.
Externí odkaz:
https://doaj.org/article/2276fc2a5e154c93b0c8393ec09338ed
Autor:
Ferreira Sérgio Luis Costa, Santos Hilda Costa dos, Ferreira Janeide Reis, Araújo Neyla Margarida Lopo de, Costa Antônio Celso Spinola, Jesus Djane Santiago de
Publikováno v:
Journal of the Brazilian Chemical Society, Vol 9, Iss 6, Pp 525-530 (1998)
The present paper describes a procedure for separation, preconcentration and sequential determination of trace amounts of copper and zinc in natural water samples, by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The proposed met
Externí odkaz:
https://doaj.org/article/505fe6c914e0466cab8fc1a99e04375d
Autor:
Reis Boaventura F., Rocha Fábio R. P., Teixeira Leonardo Sena Gomes, Costa Antônio Celso Spinola, Korn Mauro
Publikováno v:
Química Nova, Vol 23, Iss 1, Pp 116-118 (2000)
A simple and low cost flow cell is proposed for measurements by solid-phase spectrophotometry employing a conventional spectrophotometer. The flow cell geometry allows the employment of a large amount of the solid support without causing both excessi
Externí odkaz:
https://doaj.org/article/390e27de5fc04e1eae74ac8c0f393308