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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Electrodeposition of iridium in graphite tube as permanent chemical modifier in atomic absorption spectrometry

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Author(s):
Juliana Naozuka [1] ; Pedro V. Oliveira [2] ; Jairo J. Pedrotti [3]
Total Authors: 3
Affiliation:
[1] Universidade de São Paulo. Instituto de Química
[2] Universidade de São Paulo. Instituto de Química
[3] Universidade de São Paulo. Instituto de Química
Total Affiliations: 3
Document type: Journal article
Source: Química Nova; v. 26, n. 6, p. 934-937, 2003-12-00.
Abstract

A tubular electrochemical flow-cell for iridium deposition on the inner surface of pyrolytic graphite tube for permanent chemical modification is proposed. A transversal heated graphite tube was used as working electrode, a cylindrical piece of graphite inserted into the graphite tube as auxiliary electrode, and a micro Ag/AgCl(sat) as reference electrode. Iridium solution in 1.0 mol L-1 HCl, flowing at 0.55 mL min-1 for 60 min was used to perform the electrochemical modification. The applied potential to the flow-cell was - 0.700 V vs Ag/AgCl. Scanning electron microscopy images were taken for thermal and electrochemical modified graphite surface in order to evaluate the iridium distribution. Selenium hydride trapping was used to verify the performance of the proposed permanent chemical modifier. (AU)