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Photometrische Bestimmung von Thallium in Bleilegierungen mit Triphenyltetrazoliumchlorid

Photometric determination of thallium in lead alloys with triphenyltetrazolium chloride

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Zusammenfassung

Eine neue photometrische Methode zur Bestimmung von Thallium in Bleilegierungen wird vorgeschlagen. Die Methode beruht auf der selektiven Extraktion von Tl3+ als Triphenyltetrazolium (TT) Komplex (TT) (TlCl4) durch Benzol. Der aus salzsaurem Medium extrahierte Komplex ist farblos. Er wird mit wäßriger Lösung von Kristallviolett behandelt. Tetraphenyltetrazolium wird durch das Kation des Farbstoffes ausgetauscht. Danach wird photometriert. Die Extinktion ist der Tl3+-Konzentration proportional. Die Bestimmung wird durch Sb5+, As5+, Sn4+, Bi3+, Co2+, Te4+, Ga3+, In3+ nicht gestört. Als störendes Ion wirkt nur Au3+, das leicht entfernt werden kann. Der Verteilungskoeffizient des (TT) (TlCl4) in Wasser und Benzol ist 1∶6,6. Die Benzollösung folgt dem Beer'schen Gesetz in den Grenzen 1–13μg Tl3+. Der Relativfehler der Methode ist 2,68%. Sie ist durch große Selektivität, Genauigkeit und Empfindlichkeit gekennzeichnet. Man kann 10−4% Thallium in Bleilegierungen bestimmen.

Summary

A new photometric method for the determination of thallium in lead alloys is suggested. The method is based on the selective extraction by benzene of Tl3+ as the triphenyltetrazolium (TT) complex (TT) (TlCl4). The complex extracted from hydrochloric acid medium is colorless. When it is treated with an aqueous solution of crystal violet, tetraphenyltetrazolium is exchanged by the cation of the dyestuff. Then photometry is applied. The extinction is proportional to the Tl3+ concentration. The determination is not disturbed by Sb5+, As5+, Sn4+, Bi3+, Co2+, Te4+, Ga3+, In3+. Only Au3+ functions as interfering ion and it is reardily removed. The distribution coefficient of the (TT) (TlCl4) complex in water and benzene is 1∶6.6. The benzene solution obeys the Beer's law within the limits 1–13μg Tl3+. The relative error of the method is 2.68%. The method is characterized by great selectivity, precision and sensitivity. It is possible to determine l0−4% thallium in lead alloys.

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Authors and Affiliations

  1. Universität Plovdiv, Bulgarien

    A. Alexandrow & A. Dimitrow

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  1. A. Alexandrow
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  2. A. Dimitrow
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Alexandrow, A., Dimitrow, A. Photometrische Bestimmung von Thallium in Bleilegierungen mit Triphenyltetrazoliumchlorid. Mikrochim Acta 60, 680–686 (1972). https://doi.org/10.1007/BF01220079

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  • DOI: https://doi.org/10.1007/BF01220079

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