Summary
Zinc and cadmium are extracted from aqueous solution with 1,2-naphthoquinone thiosemicarbazone for simultaneous determination by atomic-absorption spectrophotometry. This compound reacts with zinc and cadmium in weakly acid medium to produce chelates which are extractable into methyl isobutyl ketone. The atomicabsorption is measured at 213.9 and 228.8nm for zinc and cadmium, respectively. The sensitivity is 0.3 ng per ml of original aqueous solution and several foreign ions are tolerated in 100-fold ratio to Zn or Cd.
Zusammenfassung
Zink und Cadmium werden aus wäßriger Lösung mit 1,2-Naphthochinon-thiosemicarbazon zwecks gemeinsamer Bestimmung durch Atomabsorptions-Spektrophotometrie extrahiert. Diese Verbindung reagiert mit Zink und Cadmium in schwach saurem Medium unter Bildung von Chelaten, die sich mit Methylisobutylketon extrahieren lassen. Die Atomabsorption wird für Zink und Cadmium bei 213,9 bzw. 228,8 nm gemessen. Die Empfindlichkeit beträgt 0,3 ng/ml der ursprünglichen Lösung. Eine Reihe von Fremdionen stören auch bei 1000fachem Überschuß nicht.
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Silva, M., Valcárcel, M. Liquid-liquid extraction of zinc and cadmium with 1,2-naphthoquinone thiosemicarbazone into methyl isobutyl ketone, and their simultaneous determination by atomic-absorption spectrophotometry. Mikrochim Acta 79, 315–324 (1983). https://doi.org/10.1007/BF01303918
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DOI: https://doi.org/10.1007/BF01303918