Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Sérgio Luis Costa Ferreira"'
Autor:
Simone de Fátima Pinheiro PEREIRA, Sérgio Luis Costa FERREIRA, Antonio Celso Spínola COSTA, Augusto César Fonseca SARAIVA, Antonia Kelen Frota SILVA
Publikováno v:
Eclética Química, Vol 27, Iss 1 (2018)
Pelo uso de técnicas mais baratas, como a do SDDC, é possível determinar níveis traços de arsênio em cabelo; entretanto esta técnica apresenta alguns inconvenientes como baixa estabilidade e o odor desagradável da piridina. A piridina foi sub
Externí odkaz:
https://doaj.org/article/595593ac03b24ceab4a99605d42ffedc
Publikováno v:
Química Nova, Vol 32, Iss 6, Pp 1596-1608 (2009)
The establishment of quality standards for biodiesel was a key step to win the confidence of the market and the automotive industry, thus ensuring the success of the new fuel. In this review are presented standard methods and other analytical methods
Externí odkaz:
https://doaj.org/article/36b9a129c7774d79b546ebe591ee1e68
Autor:
Fábio Alan Carqueija Amorim, Ivon Pinheiro Lobo, Vera Lucia C. S. Santos, Sérgio Luis Costa Ferreira
Publikováno v:
Química Nova, Vol 31, Iss 7, Pp 1784-1790 (2008)
This paper present an overview of way covered for the spectrometry of atomic absorption (AAS), tracing a line of the historical events in its development and its establishment as a multielement technique. Additionally, the efforts carried by through
Externí odkaz:
https://doaj.org/article/6c3b73262b3642e0b482413ba60b3ec6
Autor:
Rafael Conceição Costa, Jéssica Costa Leite, Geovani Cardoso Brandão, Sérgio Luis Costa Ferreira, Walter Nei Lopes dos Santos
Publikováno v:
Food Analytical Methods.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1acf3c1a8e0bf824102decc6f6504238
https://doi.org/10.1007/s12161-023-02492-7
https://doi.org/10.1007/s12161-023-02492-7
Autor:
Ricardo Jorgensen Cassella, Ricardo Erthal Santelli, Aline Garcia Branco, Valfredo Azevedo Lemos, Sérgio Luis Costa Ferreira, Marcelo Souza de Carvalho
Publikováno v:
The Analyst. 124:805-808
A method is proposed for the determination of aluminum by flow injection spectrophotometry with Methyl Thymol Blue after separation of the interferent ions employing a polyurethane foam (PUF) minicolumn. The separation process is based on the retenti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d4e02f7fb395cb9ad0fd7449dee47543
https://doi.org/10.1039/a900778d
https://doi.org/10.1039/a900778d
Autor:
Simone de Fátima Pinheiro Pereira, Sergio Luis Costa Ferreira, G. R. Oliveira, Dulcidéia da Conceiçao Palheta, B. C. Barros
Publikováno v:
Eclética Química, Vol 33, Iss 3, Pp 23-28 (2018)
In this paper, a new, simple and sensitive method for arsenic determination in soil is proposed. This is based on the reduction of silver (I) and iron (III) ions by arsine followed by a complexation reaction of iron (II) with the spectrophotometric r
Externí odkaz:
https://doaj.org/article/b747d7e505f7445da6e796af9c5bc81b
Publikováno v:
Química Nova, Vol 23, Iss 2, Pp 155-160 (2000)
The present work proposes the application of the 4-Hidroxy-3-(2-hydroxynaphtylazo)-benzenesulphonic acid (C.I. 15670), Alizarine Violet N (AVN), as a reagent for direct aluminium determination using molecular absorption spectrophotometry in the prese
Externí odkaz:
https://doaj.org/article/034cbfec8c5c4bafa75bb059ae25f956
Autor:
Antônio Celso Spínola Costa, Júlio César Rosa Assis, André Luís Carvalho Torres, Sérgio Luís Costa Ferreira, Maria das Graças Andrade Korn, Leonardo Sena Gomes Teixeira
Publikováno v:
Química Nova, Vol 22, Iss 2, Pp 194-196 (1999)
Externí odkaz:
https://doaj.org/article/0852d01d1bad426f96e9eb378d1c064d
Autor:
Rejane Mara Frizzarin
Publikováno v:
Biblioteca Digital de Teses e Dissertações da USP
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
Procedimentos analíticos espectrofotométricos foram desenvolvidos empregando etapas de separação e pré-concentração em sistemas de análises em fluxo com multi-impulsão ou lab-in-syringe, com aplicação a amostras de interesse agronômico (f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c68408808856ecefc89ad56d170391c
https://doi.org/10.11606/t.64.2014.tde-30032015-160404
https://doi.org/10.11606/t.64.2014.tde-30032015-160404
Autor:
Renato Camargo Matos
Publikováno v:
Biblioteca Digital de Teses e Dissertações da USP
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
No presente trabalho são descritos métodos versáteis para determinações simultâneas multicomponentes. Estes são baseados num sistema de detecção multicanal acoplado a célula em fluxo contendo um conjunto de microeletrodos modificados. O pri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd28314b109243ce98c29710cc1a225e