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On the interaction between gold and copper in mercury

Über die Wechselwirkung zwischen Gold und Kupfer in Quecksilber

  • Anorganische Und Physikalische Chemie
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Monatshefte für Chemie / Chemical Monthly Aims and scope Submit manuscript

Abstract

On the base of cyclic voltammetry, chronoamperometry and potentiometry experiments with the use of the hanging mercury drop electrodes, there was found that a solid AuCu compound is formed in the complex Au-Cu amalgam. The stability of AuCu is controlled by its solubility product, which is equal (7.1±1.5)·10−6 M 2 at 298 K. The temperature dependence of the solubility product allowed to determine ΔH AuCu of formation in mercury. This value is compared with ΔH AuCu of the reaction in the binary system. On the basis of theBorn-Haber cycle one may conclude that the AuCu formed in mercury phase should have the same structure as in the binary alloy. Some thermodynamic aspects of reactions in the Au-Cu-Ga amalgam are discussed. The solubility of copper in mercury was experimentally confirmed and is equal (1.1±0.1) · 10−2at.%.

Zusammenfassung

Mit Hilfe von voltammetrischen, chronoamperometrischen und potentiometrischen Experimenten mit der hängenden Quecksilbertropfelektrode wurde eine feste AuCu-Verbindung in Au-Cu-Amalgam gefunden. Die Beständigkeit der Verbindung AuCu wird durch das Löslichkeitsprodukt bestimmt, das gleich (7,1 ± 1,5) · 10−6 M 2 bei 298 K ist. Die Temperaturabhängigkeit des Löslichkeitsproduktes erlaubt die Bestimmung der Bildungswärme ΔH AuCu der Verbindung in Quecksilber. Dieser Wert wird mit der Bildungswärme ΔH AuCu im binären System verglichen. Auf der Basis desBorn-Haber-Kreisprozesses kann man schließen, daß das in Quecksilber gebildete AuCu dieselbe Struktur wie im binären System hat. Verschiedene thermodynamische Aspekte der Reaktionen in Au-Cu-Ga-Amalgam werden diskutiert. Die Löslichkeit von Kupfer in Quecksilber wurde experimentell bestätigt und beträgt (1,1 ± 0,1) · 10−2 at.%.

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Authors and Affiliations

  1. Laboratory of Electroanalytical Chemistry, Department of Chemistry, University of Warsaw, PL-02093, Warszawa, Poland

    Danuta Sasim, Malgorzata Śrudka & Cezary Gumiński

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  1. Danuta Sasim
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  2. Malgorzata Śrudka
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  3. Cezary Gumiński
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Sasim, D., Śrudka, M. & Gumiński, C. On the interaction between gold and copper in mercury. Monatsh Chem 115, 45–56 (1984). https://doi.org/10.1007/BF00798420

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  • DOI: https://doi.org/10.1007/BF00798420

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