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Extraction of cobalt(II) from aqueous thiocyanate and chloride solutions with alamine, alamine oxide and tri-n-octylphosphine oxide

Extraktion von Kobalt(II) aus wäßrigen Thiocyanat- und Chloridlösungen mit Alamin, Alaminoxid und Tri-n-octylphosphinoxid

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Zusammenfassung

Die Extraktion von Kobalt(II) aus KNCS-, HNCS-, LiCl- und HCl-Lösungen mit Alamin 336-S, Alaminoxid und Tri-n-octylphosphinoxid wurde untersucht. Im Falle von nichtsauren Systemen nimmt die Extrahierbarkeit in der Reihenfolge AlamO > TOPO > Alamin ab, während für saure Systeme die Reihenfolge Alamin > AlamO > TOPO gilt. Unter nichtsauren Bedingungen erfolgt die Extraktion stets durch Solvatation, wogegen in den Systemen Alamin-HCl, Alamin-HNCS sowie AlamO-HCl Anionenaustausch maßgebend ist. Gemischte Extraktionsmechanismen herrschen in den Systemen AlamO-HNCS, TOPO-HCl und TOPO-HNCS. Die für die flüssig-flüssig-Extraktion beschriebene Schlußfolgerungen scheinen auch für die Umkehrphasen-Dünnschicht-Chromatographie zu gelten.

Summary

The extraction of Co(II) from KNCS, HNCS, LiCl and HCl solutions with Alamine 336-S, Alamine oxide and tri-n-octylphosphine oxide has been studied. For acid-deficient systems, the extraction efficiency decreases in the order AlamO > TOPO > Alamine, while the sequence is Alamine > AlamO > TOPO for extraction from acid solutions. Under acid-deficient conditions, extraction invariably proceeds through solvation. On the other hand, in the systems Alamine-HCl and -HNCS as well as AlamO-HCl, extraction is governed by anion-exchange. A mixed extraction mechanism occurs with the AlamO-HNCS, TOPO-HCl and TOPO-HNCS systems. The conclusions reported for liquid-extraction also appear to apply to reversed-phase thin-layer chromatography.

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  1. Department of Analytical Chemistry, Free Reformed University, Amsterdam, The Netherlands

    G. J. de Jong & U. A. Th. Brinkman

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  1. G. J. de Jong
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  2. U. A. Th. Brinkman
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de Jong, G.J., Brinkman, U.A.T. Extraction of cobalt(II) from aqueous thiocyanate and chloride solutions with alamine, alamine oxide and tri-n-octylphosphine oxide. Z. Anal. Chem. 289, 358–365 (1978). https://doi.org/10.1007/BF00439727

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