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Coulometric titration of acid with a single beam fluorescence detection system

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Summary

An improved single-beam fluorescence detection system for coulometric titrations is presented. A null point procedure is used wherein the initial fluorescence emission intensity of an acid-base indicator is re-established by electrogeneration of base following addition of a sample of acid. Amounts of hydrogen ion from 1284 to 12.84 nanoequivalents were automatically determined with errors of a few percent in most cases. Precision ranged from ±0.5% relative for the largest amount of hydrogen ion studied to ±8.8% for the smallest.

Zusammenfassung

Ein verbesserter Fluoreszenznachweis wurde für coulometrische Titrationen vorgeschlagen. Dazu wurde ein Nullpunktverfahren verwendet, wobei die ursprüngliche Fluoreszenzintensität eines Säure-Base-Indikators durch Elektrogeneration einer Base nach der Zugabe einer Säureprobe wiederhergestellt wird. 1284 bis 12,84 Nanoäquivalente Wasserstoffionen können so mit wenigen Prozent Fehler automatisch bestimmt werden. Die Genauigkeit liegt zwischen ±0,5% für die größten und ±8,8% für die geringsten Mengen H+.

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References

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Author notes

  1. G. E. Cadwgan Jr.

    Present address: Technical Center, Union Carbide Corp., P. O. Box 8361, 25303, S. Charleston, W. Va.

Authors and Affiliations

  1. Department of Chemistry, University of Massachusetts, 01003, Amherst, Mass., USA

    G. E. Cadwgan Jr. & D. J. Curran

Authors
  1. G. E. Cadwgan Jr.
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  2. D. J. Curran
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Cadwgan, G.E., Curran, D.J. Coulometric titration of acid with a single beam fluorescence detection system. Mikrochim Acta 68, 461–466 (1977). https://doi.org/10.1007/BF01196232

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  • DOI: https://doi.org/10.1007/BF01196232

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