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Applications of Ion-Selective Electrodes in Organic Microanalysis: Potentiometric Determination of Organic Cations Precipitated by Tetraphenylborate

Anwendung ionenselektiver Elektroden (ISE) in der organischen Mikroanalyse: potentiometrische Bestimmung organischer Kationen nach Fällung mit Tetraphenylborat

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Summary

Sodium tetraphenylborate has been used in the potentiometric precipitation titration of various water-soluble organic cations, mostly containing a quaternary ammonium moiety. Emf's were monitored with a fluoroborate ion-selective indicator electrode and a double-junction reference electrode. The perchlorate and nitrate electrodes also respond to the various cations. The solid-state cyanide electrode responds to most of the cations investigated. This makes it possible to carry out titrations in partially nonaqueous media. Some of the compounds which can be determined are alkaloids, dyes, and other organic bases.

Zusammenfassung

Natriumtetraphenylborat wurde zur potentiometrischen Fällungstitration verschiedener wasserlöslicher organischer Kationen verwendet, von denen die meisten einen Rest einer quartären Ammoniumbase enthielten. Die EMK wurde mit Hilfe einer Fluoroborat-ISE und einer „double-junction“ Bezugselektrode gemessen. Perchlorat- und Nitratelektroden eignen sich gleichfalls für verschiedene Kationen. Die Festkörper-Cyanid-Elektrode reagiert mit den meisten der untersuchten Kationen. Infolgedessen kann man die Titrationen in teilweise nicht-wäßrigen Medien durchführen. Zu den analysierbaren Kationen gehören Alkaloide, Farbstoffe u. dgl.

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Authors and Affiliations

  1. Lawrence Livermore National Laboratory, University of California Livermore, Calif., USA

    Walter Selig

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  1. Walter Selig
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This paper is dedicated to the memory of my father, Dr. Sigmund Selig, who died in April 1980.

Work performed under the auspices of the U. S. Department of Energy by the Lawrence Livermore Laboratory under contract number W-7405-ENG-48.

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Selig, W. Applications of Ion-Selective Electrodes in Organic Microanalysis: Potentiometric Determination of Organic Cations Precipitated by Tetraphenylborate. Mikrochim Acta 74, 133–144 (1980). https://doi.org/10.1007/BF01196494

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  • DOI: https://doi.org/10.1007/BF01196494

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