Uma célula eletroquímica de fluxo para modificação permanente de tubo de grafite empregado em absorção atômica

• Autor(a) principal: Moreno,Ruben G. M.
• Data de Publicação: 2001
• Outros Autores: Oliveira,Elisabeth de, Oliveira,Pedro V., Pedrotti,Jairo J.
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Química Nova (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422001000300018
• topic: graphite tube flow cell; permanent modifier; atomic absorption spectrometry

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.