Multivariate technique for optimization of digestion procedure by focussed microwave system for determination of Mn, Zn and Fe in food samples using FAAS

Autor: Marcos A. Bezerra, Sergio Luis Costa Ferreira, Otoniel D. Sant'Ana, Ricardo J. Cassella, Ricardo Erthal Santelli

Publikováno v: Talanta. 68:1083-1088

This article describes the development by response surface methodology (RSM) of a procedure for iron, zinc and manganese determination by flame atomic absorption spectrometry (FAAS) in food samples after digestion employing a focussed microwave syste

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::de0d7d86b432902ba3af6958424694cf
https://doi.org/10.1016/j.talanta.2005.07.010

Solid phase extraction of Cu(II) as diethyldithiocarbamate (DDTC) complex by polyurethane foam

Autor: Ricardo J. Cassella, Marcelo Souza de Carvalho, Luciene S. Jesuino, Otoniel D. Sant'Ana, Ricardo Erthal Santelli

Publikováno v: Journal of the Brazilian Chemical Society, Vol 14, Iss 5, Pp 728-733 (2003)
Journal of the Brazilian Chemical Society, Volume: 14, Issue: 5, Pages: 728-733, Published: OCT 2003
Journal of the Brazilian Chemical Society v.14 n.5 2003
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ

This paper presents a study about the sorption of copper-diethyldithiocarbamate complex onto polyurethane foam (PUF). It was observed that the maximum sorption of Cu(II) (80 or 150 µg L-1) was verified at pH 6.8 in presence of 4.5 x 10-5 mol L-1 DDT

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f9b6923009582e4d361a91e7d81a9dbc
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532003000500005

Precipitation–dissolution system for silver preconcentration and determination by flow injection flame atomic absorption spectrometry

Autor: Angela de Luca Rebello Wagener, Ricardo J. Cassella, Mercedes Gallego, Otoniel D. Sant'Ana, Miguel Valcárcel, Ricardo Erthal Santelli

Publikováno v: Talanta. 56:673-680

In this paper, flame atomic absorption spectrometry was used for the determination of silver in various materials. The proposed preconcentration method is based on the continuous precipitation of silver as p -dimethylaminobenzilidene–rhodanine (PDB

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::901103d0d685c5a9171952b5d261bbe9
https://doi.org/10.1016/s0039-9140(01)00604-x

Selenium determination by electrothermal atomic absorption spectrometry in petroleum refinery aqueous streams containing volatile organic compounds

Autor: Ricardo Erthal Santelli, Ricardo J. Cassella, Alessandra T. Rangel, Otoniel D. Sant'Ana, Maria de Fátima Batista de Carvalho

Publikováno v: Microchemical Journal. 71:21-28

An electrothermal atomic absorption spectrometry (ETAAS) with polarized Zeeman background correction was used for determining selenium in petroleum refinery aqueous streams containing large amounts of volatile unknown organic compounds. Some paramete

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7591bd05796ce12726a83fbee823a1b3
https://doi.org/10.1016/s0026-265x(01)00110-2