potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométrico potentialities of electrodeposited lead dioxide as a potentiometric sensor

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ID: 151062
1998
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Abstract
This paper proposes an experiment to be performed in both instrumental analysis and experimental physical-chemistry curricular disciplines in order to open options to develop challenging basic research activities. Thus the experimental procedures and the results obtained in the preparation of electrodeposited lead dioxide onto graphite and its evaluation as potentiometric sensor for H3O+ and Pb2+ ions, are presented. The data obtained in acid-base titrations were compared with those of the traditional combination glass electrode at the same conditions. Although a linear sub-Nernstian response to free hydrogen ions was observed for the electrodeposited PbO2 electrode, a good agreement was obtained between them. Working as lead(II) sensing electrode, the PbO2 showed a linear sub-Nernstian behavior at total Pb2+ concentrations ranging from 3,5 x 10-4 to 3,0 x 10-2 mol/L in nitrate media. For the redox couple PbO2/Pb(II) the operational slope converges to the theoretical one, as the acidity of the working solution increases.
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capelato1998qumicapotencialidades Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Milton Duffles Capelato;Neila Maria Cassiano
Journal greece and rome
Year 1998
DOI
10.1590/S0100-40421998000400022
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000400022
Keywords
acid-base titration

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