An electrochemical flow cell for permanent modification of graphite tube employed in atomic absorption Uma célula eletroquímica de fluxo para modificação permanente de tubo de grafite empregado em absorção atômica

Moreno R.G.M.; De Oliveira E.; Oliveira P.V.; Pedrotti J.J.

An electrochemical flow cell for permanent modification of graphite tube employed in atomic absorption Uma célula eletroquímica de fluxo para modificação permanente de tubo de grafite empregado em absorção atômica

Tipo

Artigo

Data de publicação

2001

Periódico

Quimica Nova

Citações (Scopus)

1

Autores

Moreno R.G.M.
De Oliveira E.
Oliveira P.V.
Pedrotti J.J.

Resumo

A flow cell assembled on the original geometry of a graphite tube to achieve permanent chemical modifier is proposed. The graphite tube operates as the working electrode. A stainless steel tube, positioned downstream from the working electrode, was used as the auxiliary electrode. The potential value applied on the graphite electrode was measured against a micro reference electrode (Ag/AgCl) inserted into the auxiliary electrode. Palladium solutions in acetate buffer (100 mmol L-1, pH = 4.8), flowing at 0.5 mL min-1 for 60 min was used to perform the electrochemical modification. A mercury solution (1 ng) was used to evaluate the performance of the permanent palladium modifier.