Summary
N-Phenylcinnohydroxamic acid (PCHA) reacts with vanadium (V) in thiocyanate medium, giving water insoluble mixed ligand complex, extractable into chloroform. On the basis of sensitive colour reaction, a new method for the extraction and photometric determination of vanadium(V) has been developed. The mixed ligand complex can be quantitatively extracted into chloroform from 3.0–7.0M acetic acid media. The green coloured ternary complex has a broad absorption band around 590 nm. The photometric sensitivity of the colour reaction is 0.0068μg of vanadium per cm2. The effect of foreign ions and several experimental parameters have been studied. The composition of the complex has been found to be 1∶2∶2 (vanadium:PCHA:SCN).
Zusammenfassung
N-Phenylzimthydroxamsäure reagiert mit Vanadin(V) in Gegenwart von Rhodanid unter Bildung eines mit Chloroform extrahierbaren, gemischten Komplexes. Auf der Grundlage dieser Farbreaktion wurde eine neue Methode der Extraktion und photometrischen Bestimmung von Vanadin(V) entwickelt. Aus 3,0–7,0 M Essigsäure läßt sich dieser Komplex quantitativ mit Chloroform extrahieren. Der grüne ternäre Komplex hat eine breite Absorptionsbande bei 590 nm. Die Empfindlichkeit der Farbreaktion beträgt 0,0068μg V per cm2. Die Wirkung von Fremdionen und einzelner experimenteller Parameter wurde untersucht. Die Zusammensetzung des Komplexes beträgt 1∶2∶2 (V:PCHA:SCN).
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Assefa, M., Chandravanshi, B.S. Solvent extraction and spectrophotometric determination of vanadium (V) as a mixed ligand complex with N-phenylcinnamohydroxamic acid and thiocyanate. Mikrochim Acta 79, 255–262 (1983). https://doi.org/10.1007/BF01303912
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DOI: https://doi.org/10.1007/BF01303912