SciELO - Scientific Electronic Library Online

vol.28 issue1Espectroelectrochemical behavior of clay-dye structured systemsSimultaneous and direct determination of Al, As, Fe, Mn and Ni in cachaça by graphite furnace on atomic absoption spectrometry author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Eclética Química

Print version ISSN 0100-4670On-line version ISSN 1678-4618


VILLAFRANCA, A. C.; MORAES, M. de  and  PEZZA, L.. Evaluation and characterization of the sensor pellet of an electrode of the second kind sensitive to oxalate. Eclet. Quím. [online]. 2003, vol.28, n.1, pp.85-90. ISSN 0100-4670.

The Pt|Hg|Hg2Ox|Graphite (Ox = oxalate ion) electrode was studied using NaClO4 as the support electrolyte. Preliminary experiments were carried out using NaNO3 as support electrolyte, following the same methodology as the previous work, and it was verified that there was a decrease in the electrode sensitivity over its usage time. In order to understand the behavioral difference of the electrode in NaClO4 and NaNO3 media, experiments were carried out to obtain potential vs time curves to verify the behavior as a function of time and also in different ionic media. The surface morphology of the sensor pellet used in NaNO3 media presented alteration, which suggests that this media favors reactions on the pellet surface when it comes into contact with the solution.

Keywords : electrode of the second kind; oxalate; perchlorate; nitrate.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License