The surface morphology of ion-selective membrane electrodes. Part 3. Studies on the Lead Ion-selective Membrane

E. Pungor, K. Tóth, G. Nagy, L. Pólos, M. F. Ebel, I. Wernisch

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Abstract

Studies of the changes in the surface state of the ion-selective membrane and in the performance of the silver sulphide-lead sulphide (2:1) precipitate-based electrode are described. A scanning electron microscope was used to examine the surface of the electrode membrane. The results indicate that passivation of the lead-selective electrode caused by chemical and electrochemical oxidation is due to transformation of the lead sulphide at the membrane surface. The electrode surface becomes depleted in lead sulphide; lead sulphate crystals are formed during chemical oxidation with hydrogen peroxide, and lead oxide crystals during anodic oxidation.

Original languageEnglish
Pages (from-to)23-32
Number of pages10
JournalAnalytica Chimica Acta
Volume147
Issue numberC
DOIs
Publication statusPublished - 1983

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ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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